CN113301494B - Audio playing system, control equipment and power amplifier equipment - Google Patents

Audio playing system, control equipment and power amplifier equipment Download PDF

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Publication number
CN113301494B
CN113301494B CN202110569469.7A CN202110569469A CN113301494B CN 113301494 B CN113301494 B CN 113301494B CN 202110569469 A CN202110569469 A CN 202110569469A CN 113301494 B CN113301494 B CN 113301494B
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digital audio
power amplifier
bus transceiver
signal
slave
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CN113301494A (en
Inventor
舒敏
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Ecarx Hubei Tech Co Ltd
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Ecarx Hubei Tech Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • H04L12/40013—Details regarding a bus controller
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/403—Bus networks with centralised control, e.g. polling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/008—Systems employing more than two channels, e.g. quadraphonic in which the audio signals are in digital form, i.e. employing more than two discrete digital channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40267—Bus for use in transportation systems
    • H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/01—Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Amplifiers (AREA)

Abstract

The embodiment of the invention provides an audio playing system, a control device and a power amplifier device, wherein the system comprises: the control device and at least one power amplifier device. The controller is used for sending digital audio signals to the main bus transceiver. The master bus transceiver is used for receiving digital audio signals and transmitting the digital audio signals to the slave bus transceiver through the digital audio bus. The slave bus transceiver is used for receiving the digital audio signals and forwarding each frame of digital audio data contained in the digital audio signals to the power amplifier module to which the corresponding output channel belongs according to the corresponding relation recorded in the digital audio signals. The power amplifier module is used for receiving the digital audio data sent by the bus transceiver, distributing the digital audio data to the corresponding output channels according to the corresponding relation, performing digital-to-analog conversion on the digital audio data, and controlling the loudspeakers corresponding to the output channels to play the converted audio data. The audio playing system provided by the embodiment of the invention can realize audio playing.

Description

Audio playing system, control equipment and power amplifier equipment
Technical Field
The invention relates to the technical field of audio processing, in particular to an audio playing system, control equipment and power amplifier equipment.
Background
The electronic device can realize audio playing through the loudspeakers after processing the audio data, however, a single loudspeaker can only support monaural audio playing, and if better audio playing effects such as stereo are to be realized, the audio playing can be synchronously performed through a plurality of loudspeakers. In view of the above, it is necessary to control a plurality of speakers to realize audio playback.
Disclosure of Invention
The embodiment of the invention aims to provide an audio playing system, control equipment and power amplifier equipment so as to realize audio playing. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present invention provides an audio playing system, where the system includes: the power amplifier device comprises a slave bus transceiver and at least one power amplifier module, and the master bus transceiver is connected with the slave bus transceiver through a digital audio bus;
the controller is configured to send a digital audio signal to the main bus transceiver, where the digital audio signal has recorded therein: the corresponding relation between each frame of digital audio data and the output channel of the power amplifier module;
the master bus transceiver is used for receiving the digital audio signal and transmitting the digital audio signal to the slave bus transceiver through the digital audio bus;
the slave bus transceiver is used for receiving the digital audio signals and forwarding each frame of digital audio data contained in the digital audio signals to the power amplifier module to which the corresponding output channel belongs according to the corresponding relation recorded in the digital audio signals;
and the power amplifier module is used for receiving the digital audio data sent by the bus transceiver, distributing the digital audio data to the corresponding output channels according to the corresponding relation, performing digital-to-analog conversion on the digital audio data, and controlling the loudspeakers corresponding to the output channels to play the converted audio data.
In an embodiment of the present invention, the power amplifier device further includes: the switch assembly is respectively connected with the digital audio bus, the power supply, the slave bus transceiver in the power amplifier equipment and the power amplifier module in the power amplifier equipment;
the controller is also used for sending a power supply control signal through the digital audio bus so as to control the power supply to be switched on and off with the slave bus transceiver and the power amplifier module in the power amplifier equipment through the switch component.
In one embodiment of the invention, the switch assembly comprises an optical coupling sensor, an electronic switch and a DCDC power supply;
an anode and a cathode of the optical coupling sensor are respectively connected with two sub-buses contained in the digital audio bus, an emitter of the optical coupling sensor is connected with a first end of the electronic switch, a collector of the optical coupling sensor is connected with a second end of the electronic switch, the first end of the electronic switch is connected with the power supply, a third end of the electronic switch is connected with the DCDC power supply and a power amplification module of the power amplification equipment, and the DCDC power supply is connected with a slave bus transceiver in the power amplification equipment;
the optical coupling sensor is used for sending an enabling signal to the electronic switch through the emitter and the collector after receiving the power supply control signal;
and the electronic switch is used for controlling the connection or disconnection between the first end and the third end according to the enabling signals received by the first end and the second end.
In one embodiment of the invention, under the condition that the number of the power amplifier devices is more than 1, the power amplifier devices are connected in series, an output interface of a slave bus transceiver in each power amplifier device except the last power amplifier device is connected with an input interface of the slave bus transceiver in the next power amplifier device through a digital audio bus, and an output interface of the master bus transceiver is connected with an input interface of the slave bus transceiver in the first power amplifier device through a digital audio bus;
the slave bus transceiver is specifically configured to:
receiving the digital audio signal;
if the power amplifier module in the power amplifier equipment where the slave bus transceiver is located controls to play the digital audio signals, forwarding each frame of digital audio data contained in the digital audio signals to the power amplifier module to which the corresponding output channel belongs according to the corresponding relation recorded in the digital audio signals;
otherwise, the digital audio signal is sent to the slave bus transceiver in the next power amplifier equipment from the output interface of the slave bus transceiver through the digital audio bus.
In an embodiment of the present invention, the controller is further configured to send configuration parameters and/or control commands to the master bus transceiver;
the master bus transceiver is also used for receiving the configuration parameters and/or the control commands and forwarding the configuration parameters and/or the control commands to the slave bus transceiver through the digital audio bus;
the slave bus transceiver is also used for receiving the configuration parameters and/or the control commands and forwarding the configuration parameters and/or the control commands to the power amplifier module;
and the power amplifier module is also used for receiving the configuration parameters and/or the control commands and configuring the power amplifier module according to the configuration parameters and/or the control commands.
In an embodiment of the present invention, the controller is further configured to send a communication setup signal to the master bus transceiver;
the master bus transceiver is further used for receiving the communication establishment signal and forwarding the communication establishment signal to the slave bus transceiver through the digital audio bus;
the slave bus transceiver is further used for receiving the communication establishment signal and sending a feedback signal to the master bus transceiver through the digital audio bus aiming at the communication establishment signal;
the master bus transceiver is further used for receiving the feedback signal and forwarding the feedback signal to the controller;
the controller is specifically configured to send a digital audio signal to the master bus transceiver upon receiving the feedback signal.
In a second aspect, an embodiment of the present invention provides a control device, where the control device includes a controller and a master bus transceiver, the master bus transceiver is used to connect with a slave bus transceiver in a power amplifier device through a digital audio bus, and the power amplifier device further includes: a power amplifier module;
the controller is configured to send a digital audio signal to the master bus transceiver, where the digital audio signal has recorded therein: the corresponding relation between each frame of digital audio data and the output channel of the power amplifier module;
the master bus transceiver is used for receiving the digital audio signal and sending the digital audio signal to the slave bus transceiver through the digital audio bus, so that the power amplification module controls the digital audio signal to be played.
In an embodiment of the present invention, the controller is further configured to send a configuration parameter and/or a control command for configuring the power amplifier module to the main bus transceiver;
the master bus transceiver is further configured to receive the configuration parameters and/or the control commands, and forward the configuration parameters and/or the control commands to the slave bus transceiver through the digital audio bus, so that the power amplifier module configures itself according to the configuration parameters and/or the control commands.
In an embodiment of the present invention, the controller is further configured to send a communication setup signal to the master bus transceiver;
the master bus transceiver is further configured to receive the communication establishment signal, forward the communication establishment signal to the slave bus transceiver through the digital audio bus, receive a feedback signal for the communication establishment signal, which is sent by the slave bus transceiver through the digital audio bus, and forward the feedback signal to the controller;
the controller is specifically configured to send a digital audio signal to the master bus transceiver upon receiving the feedback signal.
In a third aspect, an embodiment of the present invention provides a power amplifier device, where the power amplifier device includes a slave bus transceiver and at least one power amplifier module, and the slave bus transceiver is used to connect with a master bus transceiver in a control device through a digital audio bus;
the slave bus transceiver is used for receiving digital audio signals sent by the master bus transceiver through a digital audio bus, and forwarding each frame of digital audio data contained in the digital audio signals to the power amplifier module to which the corresponding output channel belongs according to the corresponding relation between each frame of digital audio data recorded in the digital audio signals and the output channel of the power amplifier module;
and the power amplifier module is used for receiving the digital audio data sent by the bus transceiver, distributing the digital audio data to the corresponding output channels according to the corresponding relation, performing digital-to-analog conversion on the digital audio data, and controlling the loudspeakers corresponding to the output channels to play the converted audio data.
In an embodiment of the present invention, the power amplifier device further includes: the switch assembly is respectively connected with the digital audio bus, the power supply, the slave bus transceiver and the power amplifier module;
the switch component is used for receiving a power supply control signal sent by the control equipment through the digital audio bus and controlling the power supply, the slave bus transceiver and the power amplifier equipment to be switched on and off.
In one embodiment of the invention, the switch assembly comprises an optical coupling sensor, an electronic switch and a DCDC power supply;
an anode and a cathode of the optical coupling sensor are respectively connected with two sub-buses contained in the digital audio bus, an emitter of the optical coupling sensor is connected with a first end of the electronic switch, a collector of the optical coupling sensor is connected with a second end of the electronic switch, the first end of the electronic switch is connected with the power supply, a third end of the electronic switch is connected with the DCDC power supply and a power amplification module of the power amplification equipment, and the DCDC power supply is connected with the slave bus transceiver;
the optical coupling sensor is used for sending an enabling signal to the electronic switch through the emitter and the collector after receiving the power supply control signal;
and the electronic switch is used for controlling the connection or disconnection between the first end and the third end according to the enabling signals received by the first end and the second end.
In an embodiment of the present invention, an output interface of the slave bus transceiver is connected to an input interface of the slave bus transceiver of the next power amplifier device through a digital audio bus;
the slave bus transceiver is specifically configured to:
receiving the digital audio signal;
if the power amplifier module in the power amplifier equipment where the slave bus transceiver is located controls to play the digital audio signals, forwarding each frame of digital audio data contained in the digital audio signals to the power amplifier module to which the corresponding output channel belongs according to the corresponding relation recorded in the digital audio signals;
otherwise, the digital audio signal is sent to the slave bus transceiver in the next power amplifier equipment from the output interface of the slave bus transceiver through the digital audio bus.
In an embodiment of the present invention, the slave bus transceiver is further configured to receive a configuration parameter and/or a control command sent by the master bus transceiver through the digital audio bus, and forward the configuration parameter and/or the control command to the power amplifier module;
and the power amplifier module is also used for receiving the configuration parameters and/or the control commands and configuring the power amplifier module according to the configuration parameters and/or the control commands.
In an embodiment of the present invention, the slave bus transceiver is further configured to receive a communication setup signal sent by the master bus transceiver through the digital audio bus, and send a feedback signal to the master bus transceiver through the digital audio bus for the communication setup signal.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides an audio playing system, which comprises control equipment and at least one power amplifier equipment, wherein the control equipment comprises a controller and a master bus transceiver, the power amplifier equipment comprises a slave bus transceiver and at least one power amplifier module, and the master bus transceiver is connected with the slave bus transceiver through a digital audio bus and used as a channel for transmitting data between the control equipment and the power amplifier equipment. The controller sends digital audio signals to the master bus transceiver, the digital audio signals comprise corresponding relations between digital audio data of each frame and the output channels, and the master bus transceiver sends the digital audio signals to the slave bus transceiver through the digital audio bus. And the slave bus transceiver respectively sends each frame of digital audio data contained in the digital audio signal to a power amplifier module to which an output channel corresponding to each frame of digital audio data belongs, and the power amplifier module distributes the digital audio data to the output channel corresponding to the digital audio data, performs digital-to-analog conversion on the digital audio data, and controls a loudspeaker corresponding to each output channel to play the converted digital audio data.
As can be seen from the above, the digital audio signal includes the corresponding relationship between each frame of digital audio data and the output channel, so that the bus transceiver can forward each frame of digital audio data to the power amplifier module to which the output channel corresponding to the digital audio data belongs, and the power amplifier module can control the speaker corresponding to the output channel to play the audio data, so that audio playing can be implemented by the audio playing system provided in the embodiment of the present invention. In addition, the control equipment and the power amplifier equipment are connected through only one digital audio bus, so that the connection mode is simple, and the complexity of the audio playing system is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic structural diagram of a first audio playing system according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a first audio playing method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second audio playing system according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a second audio playing method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a third audio playing system according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating a third audio playing method according to an embodiment of the present invention;
fig. 7A is a flowchart illustrating a fourth audio playing method according to an embodiment of the present invention;
fig. 7B is a schematic structural diagram of an in-vehicle audio playing system according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a control device according to an embodiment of the present invention;
fig. 9 is a flowchart illustrating an audio playing method for controlling a device according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a power amplifier device according to an embodiment of the present invention;
fig. 11 is a schematic flowchart of an audio playing method for a power amplifier device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments given herein by one of ordinary skill in the art, are within the scope of the invention.
In order to realize audio playing, the embodiment of the invention provides an audio playing system, control equipment and power amplifier equipment.
An embodiment of the present invention provides an audio playing system, where the system includes: the power amplifier device comprises a slave bus transceiver and at least one power amplifier module, and the master bus transceiver is connected with the slave bus transceiver through a digital audio bus;
the controller is configured to send a digital audio signal to the host bus transceiver, where the digital audio signal has recorded therein: the corresponding relation between each frame of digital audio data and the output channel of the power amplifier module;
the master bus transceiver is used for receiving digital audio signals and sending the digital audio signals to the slave bus transceiver through the digital audio bus;
the slave bus transceiver is used for receiving the digital audio signals and forwarding the digital audio data of each frame contained in the digital audio signals to the power amplifier module to which the corresponding output channel belongs according to the corresponding relation recorded in the digital audio signals;
the power amplifier module is used for receiving the digital audio data sent by the bus transceiver, distributing the digital audio data to the corresponding output channels according to the corresponding relation, performing digital-to-analog conversion on the digital audio data, and controlling the loudspeakers corresponding to the output channels to play the converted audio data.
As can be seen from the above, the digital audio signal includes the corresponding relationship between each frame of digital audio data and the output channel, so that the bus transceiver can forward each frame of digital audio data to the power amplifier module to which the output channel corresponding to the digital audio data belongs, and the power amplifier module can control the speaker corresponding to the output channel to play the audio data, so that audio playing can be implemented by the audio playing system provided in the embodiment of the present invention. In addition, the control equipment and the power amplifier equipment are connected through only one digital audio bus, so that the connection mode is simple, and the complexity of the audio playing system is low.
Referring to fig. 1, a schematic structural diagram of a first audio playing system provided in an embodiment of the present invention is shown, where the system includes: the power amplifier comprises a control device 101 and at least one power amplifier device 102, wherein the control device 101 comprises a controller 101A and a master bus transceiver 101B, the power amplifier device 102 comprises a slave bus transceiver 102A and at least one power amplifier module 102B, and the master bus transceiver 101B is connected with the slave bus transceiver 102A through a digital audio bus.
Specifically, the audio playing system may be installed In a Vehicle, and the control device 101 may be a Vehicle machine, an IHU (information Head Unit), an IVI (In-Vehicle information system), or any other Vehicle-mounted information interaction terminal.
Furthermore, a time-division multiplexing (TDM) channel and an I2C bus may exist between the controller 101A and the host bus transceiver 101B, the TDM channel is used for the controller 101A to transmit digital audio signals to the host bus transceiver 101B, and the I2C bus is used for the controller 101A and the host bus transceiver 101B to transmit other I2C data. Of course, there may be other channels capable of transmitting digital audio signals and other data between the controller 101A and the main bus transceiver 101B, which is not limited in this embodiment.
In addition, a TDM channel and an I2C bus may exist between the slave bus transceiver 102A and the power amplifier module 102B. The TDM channel is used for transmitting digital audio signals from the bus transceiver 102A to the power amplifier module 102B, and the I2C bus is used for transmitting other I2C data between the bus transceiver 102A and the power amplifier module 102B. Certainly, there may be other channels capable of transmitting digital audio signals and other data between the slave bus transceiver 102A and the power amplifier module 102B, which is not limited in this embodiment. Each power amplifier module 102B may include at least one output channel, and each output channel may correspond to one speaker for transmitting audio data to the one speaker. The power amplifier module 102B may be a power amplifier chip.
In addition, the control device 101 may further include a power source, where the power source is connected to a power supply, and the controller 101A is connected to the master bus transceiver 101B, and is configured to adjust a voltage supplied by the power supply to supply power to the controller 101A and the master bus transceiver 101B.
In addition, the power supply may also be connected to the slave bus transceiver 102A and the power amplifier module 102B in the power amplifier device 102, and configured to supply power to the slave bus transceiver 102A and the power amplifier module 102B.
Furthermore, the digital audio bus may be an A2B bus, the A2B bus is a twisted pair including two sub-buses, and the A2B bus may be used for transmitting digital audio data and I2C data. Of course, the digital audio bus may be other buses capable of transmitting digital audio signals, which is not limited in this embodiment.
Under the condition that the number of the power amplifier devices 102 included in the audio playing system is greater than 1, the slave bus transceiver 102A of each power amplifier device 102 may be directly connected to the master bus transceiver 101B through a digital audio bus.
In addition, each power amplifier device 102 may also be connected in series in sequence through a digital audio bus, the slave bus transceiver 102A of the first power amplifier device 102 is directly connected to the master bus transceiver 101B through the digital audio bus, and the slave bus transceivers 102A of the other power amplifier devices 102 are indirectly connected to the master bus transceiver 101B. The serial connection of the power amplifier devices 102 in turn may be referred to as daisy chain type serial connection, and the specific connection manner of the daisy chain type serial connection may be referred to in the following embodiments, which will not be described in detail herein.
Limited by the data processing capability of the power amplifier modules 102B, the number of output channels included in each power amplifier module 102B is limited, for example, each power amplifier module 102B can support at most 4 output channels, that is, can control at most 4 speakers to play audio. Limited by the data processing capability of the slave bus transceiver 102A, the number of the power amplifier modules 102B that can be supported by each slave bus transceiver 102A is limited, for example, each slave bus transceiver 102A can support at most 4 power amplifier modules 102B, if each power amplifier module 102B supports at most 4 output channels, each power amplifier device 102 includes at most 16 output channels, and can control at most 16 speakers to play audio.
Referring to fig. 2, a flowchart of a first audio playing method according to an embodiment of the present invention is shown.
S201: the controller 101A sends digital audio signals to the master bus transceiver 101B.
Wherein, the digital audio signal has recorded therein: and the corresponding relation between each frame of digital audio data and the output channel of the power amplifier module.
Specifically, each output channel may have a different number, and the numbers may be represented in the form of numbers, characters, and the like. The digital audio signal may record a corresponding relationship between each frame of digital audio data and the serial number of the power amplifier module.
The controller 101A may send digital audio signals to the host bus transceiver 101B over a TDM channel.
S202: the master bus transceiver 101B transmits the digital audio signal to the slave bus transceiver 102A through a digital audio bus.
In an embodiment of the present invention, when the number of the power amplifier devices is greater than 1, if each of the power amplifier devices is directly connected to the main bus transceiver 101B, the power amplifier device in which the output channel corresponding to the digital audio signal is located may be determined according to the correspondence recorded in the digital audio signal, and the digital audio signal is sent to the determined power amplifier device.
In another embodiment of the present invention, when the number of the power amplifier devices is greater than 1, if the power amplifier devices are serially connected in a daisy-chain serial connection manner, the master bus transceiver 101B may directly send the digital audio signal to the slave bus transceiver 102A of the first power amplifier device 102, and the first power amplifier device 102 forwards the digital audio signal to the other power amplifier devices 102. Specifically, the steps performed from the bus transceiver 102A can be referred to as steps a-B below, and will not be described in detail here.
In addition, if the audio playing system only includes one power amplifier device 102, the master bus transceiver 101B may directly transmit the digital audio signal to the slave bus transceiver 102A of the power amplifier device 102.
S203: the slave bus transceiver 102A forwards each frame of digital audio data contained in the digital audio signal to the power amplifier module to which the corresponding output channel belongs according to the correspondence recorded in the digital audio signal.
Specifically, after the power amplifier module 102B to which each output channel belongs and which can be recorded by the slave bus transceiver 102A receives the digital audio signal, each frame of digital audio data included in the digital audio signal may be forwarded to the power amplifier module 102B to which the output channel corresponding to the frame of digital audio data belongs.
The slave bus transceiver 102A may send the digital audio data to the power amplifier module 102B through the TDM channel.
S204: the power amplifier module 102B distributes the digital audio data to the corresponding output channels according to the corresponding relationship.
Specifically, since the correspondence is between the digital audio data and the output channel, the power amplifier module 102B can determine the output channel corresponding to each digital audio data according to the correspondence. Thus, the power amplifier module 102B may distribute the digital audio data to the corresponding output channels.
S205: the power amplifier module 102B performs digital-to-analog conversion on the digital audio data, and controls the speakers corresponding to the output channels to play the converted audio data.
Specifically, the power amplifier module 102B may perform digital-to-analog conversion on the digital audio data by using any digital-to-analog conversion manner in the prior art, and transmit the converted audio data to the corresponding speaker through the allocated output channel, thereby implementing audio playing.
In addition, before controlling the loudspeaker to play the converted audio data, the converted audio data can be amplified, and then the loudspeaker is controlled to play the amplified audio data.
As can be seen from the above, the digital audio signal includes the corresponding relationship between each frame of digital audio data and the output channel, so that the bus transceiver can forward each frame of digital audio data to the power amplifier module to which the output channel corresponding to the digital audio data belongs, and the power amplifier module can control the speaker corresponding to the output channel to play the audio data, so that audio playing can be implemented by the audio playing system provided in the embodiment of the present invention. In addition, the control equipment and the power amplifier equipment are connected through only one digital audio bus, so that the connection mode is simple, and the complexity of the audio playing system is low.
In addition, before the controller 101A sends the digital audio signal, it may perform audio processing on the digital audio signal, and then send the digital audio signal after the audio processing, and the power amplifier device 102 does not need to perform the audio processing. The power amplifier equipment does not need to be provided with a device for carrying out sound effect processing on the digital audio signal, so that the structure of the power amplifier equipment is simpler.
Referring to fig. 3, a schematic structural diagram of a second audio playing system provided in the embodiment of the present invention is shown, and compared with the embodiment shown in fig. 1, the power amplifier device further includes: and the switch component 102C, where the switch component 102C is connected to the digital audio bus, the power supply, the slave bus transceiver 102A in the power amplifier device 102, and the power amplifier module 102B in the power amplifier device, respectively.
On the basis of fig. 3, referring to fig. 4, a flowchart of a second audio playing method according to an embodiment of the present invention is shown. Compared with the aforementioned fig. 2, the following steps S206-S207 are also included.
S206: the controller 101A sends a power control signal to the master bus transceiver 101B.
Specifically, the power control signal may be a voltage signal, that is, the controller 101A may output a voltage to control the switch assembly 102C to be turned on or off. For example, the switch element 102C may be controlled to be closed by outputting a high level voltage, and the switch element 102C may be controlled to be opened by outputting a low level voltage.
The power control signal may be a digital signal or a signal of another form.
S207: the master bus transceiver 101B forwards the power control signal to the switch component 102C, so as to control the power supply to be connected or disconnected with the slave bus transceiver 102A and the power amplifier module 102B of the power amplifier device 102 through the switch component 102C.
Specifically, since the switch element is connected to the digital audio bus, the main bus transceiver 101B may send a power control signal to the switch element 102C through the digital audio bus, and the power control signal may control the switch element 102C to be turned on or off. When the switch module 102C is turned off, the power supply is not connected to the slave bus transceiver 102A and the power amplifier module 102B, so that the slave bus transceiver 102A is not connected to the power amplifier module 102B, and the slave bus transceiver is not used, which is equivalent to the power amplifier device 102 being turned off. When the switch element 102 is closed, the power supply is connected to the slave bus transceiver 102A and the power amplifier module 102B, so that the slave bus transceiver 102A and the power amplifier module 102B are powered on and can be used, which is equivalent to the power amplifier device 102 being opened.
In an embodiment of the present invention, referring to fig. 5, a schematic structural diagram of a third audio playing system provided in the embodiment of the present invention is shown, and compared with the embodiment shown in fig. 3, the switch assembly 102C includes an optical coupler sensor, an electronic switch, and a DCDC power supply.
The anode and the cathode of the optical coupler sensor are respectively connected with two sub-buses contained in the digital audio bus, the emitter of the optical coupler sensor is connected with the first end of the electronic switch, the collector of the optical coupler sensor is connected with the second end of the electronic switch, the first end of the electronic switch is connected with the power supply, the third end of the electronic switch is connected with the power amplification module of the power amplification equipment through the DCDC power supply, and the DCDC power supply is connected with the slave bus transceiver in the power amplification equipment.
In addition, the collector is grounded to the second end of the electronic switch.
Then, the photo coupler sensor transmits an enable signal to the electronic switch through the emitter and the collector after receiving the power control signal.
Specifically, according to the operating principle of the optical coupler sensor, when the level of the anode is higher than that of the cathode, the optical coupler sensor is connected, and an enable signal for controlling the electronic switch to be closed between the first end and the third end can be sent to the electronic switch through the emitter and the collector. When the level of the anode is not higher than the evaluation of the cathode, the optical coupling sensor is turned off, and an enable signal for controlling the turn-off between the first terminal and the third terminal of the electronic switch can be transmitted to the electronic switch through the emitter and the collector.
The electronic switch controls the connection or disconnection between the first end and the third end according to the enable signals received by the first end and the second end.
Specifically, since the first end is connected to a power supply, and the third end is connected to the DCDC power supply and the power amplifier module 102B, if the first end and the third end are closed, the power supply is connected to the DCDC power supply and the power amplifier module 102B, so as to supply power to the DCDC power supply and the power amplifier module 102B. Since the DCDC power supply is connected to the slave bus transceiver 102A, the DCDC power supply can adjust the supply voltage of the power supply to supply power to the slave bus transceiver 102A. Therefore, when the first terminal and the third terminal are closed, the power amplifier module 102B and the slave bus transceiver 102A are in a power-on state, and can start operating.
Otherwise, if the first terminal and the third terminal are disconnected, the power supply is disconnected from the DCDC power supply and the power amplifier module 102B, and the DCDC power supply and the power amplifier module 102B cannot be supplied with power, so that the DCDC power supply cannot supply power to the slave bus transceiver 102A. Therefore, if the first terminal and the third terminal are disconnected, the power amplifier module 102B is not powered on with the slave bus transceiver 102A, and the operation is ended.
Therefore, the controller in the control equipment can directly control the on-off of the switch component by sending the power supply control signal so as to control the on-off state of the power amplifier module and the slave bus transceiver. Therefore, if the control equipment needs to play audio through the power amplifier equipment, the power amplifier module and the slave bus transceiver can be directly controlled to be electrified, and audio playing is further realized. If the control equipment stops playing the audio, the power amplifier module and the slave bus transceiver can be directly controlled to be powered off, and audio playing is not performed any more. Therefore, the mode for controlling the power on-off states of the power amplifier module and the slave bus transceiver in the audio playing system provided by the embodiment of the invention is simpler. Moreover, the power-on and power-off states of the power amplifier module and the slave bus transceiver in the power amplifier device are controlled by the controller, so that a processing device for storing and operating programs for controlling the power-on and power-off states of the power amplifier module and the slave bus transceiver is not required to be installed in the power amplifier device, and the structure of the power amplifier device is simple.
In an embodiment of the present invention, when the number of the power amplifier devices is greater than 1, the power amplifier devices are connected in series, that is, connected in a daisy-chain series manner.
Specifically, the output interface of the slave bus transceiver 102A in each power amplifier device except the last power amplifier device is connected to the input interface of the slave bus transceiver 102A in the next power amplifier device through a digital audio bus. The output interface of the master bus transceiver 101B is connected to the input interface of the slave bus transceiver 102A in the first power amplifier device through a digital audio bus.
The output interface of the slave bus transceiver 102A may be referred to as an a port of the slave bus transceiver 102A, the input interface of the slave bus transceiver 102A may be referred to as a B port of the slave bus transceiver 102A, the output interface of the master bus transceiver 101B may be referred to as an a port of the master bus transceiver 101B, and the input interface, i.e., the B port, of the master bus transceiver 101B is connected to the controller.
Then, for the slave bus transceiver 102A in each power amplifier device 102, after receiving the digital audio signal from the slave bus transceiver 102A, the above step S103 can be implemented by the following steps a-B.
Step A: if the power amplifier module 102B in the power amplifier device 102 where the slave bus transceiver 102A is located controls to play the digital audio signal, the digital audio data of each frame included in the digital audio signal is forwarded to the power amplifier module 102B to which the corresponding output channel belongs according to the correspondence recorded in the digital audio signal.
Specifically, after the slave bus transceiver 102A receives the digital audio signal, it may be determined whether the digital audio data in the digital audio signal corresponds to the output channel included in the power amplifier module 102B of the power amplifier device 102 in which the slave bus transceiver 102A is located according to the correspondence between each frame of digital audio data recorded in the digital audio signal and the output channel, and if so, it indicates that the digital audio signal needs to be controlled and played by the power amplifier module 102B of the power amplifier device 102 that is located in the same power amplifier device 102 as the slave bus transceiver 102A. Then, the digital audio data of each frame contained in the digital audio signal may be forwarded to each power amplifier module.
The manner of forwarding the digital audio data from the bus transceiver 102A to the power amplifier module is the same as that in step S203, which is not described in detail in the embodiment of the present invention.
And B, step B: if the slave bus transceiver 102A is not controlled by the power amplifier module 102B in the power amplifier device 102 to play the digital audio signal, the output interface of the slave bus transceiver 102A sends the digital audio signal to the slave bus transceiver in the next power amplifier device through the digital audio bus.
Specifically, if the power amplifier module 102B in the power amplifier device 102 where the slave bus transceiver 102A is located is not responsible for controlling the playing of the digital audio signal, it is indicated that the digital audio signal is controlled by the power amplifier modules 102B in other power amplifier devices 102 to be played, the digital audio signal may be sent from the output interface of the slave bus transceiver 102A, the digital audio signal is sent to the slave bus transceiver 102A in the next power amplifier device 102 through the digital audio bus, and the slave bus transceiver 102A that receives the digital audio signal also executes step a or step B, and so on until the digital audio signal is played.
As can be seen from the above, the power amplifier devices in the audio playing system are connected in series, and after the slave bus transceiver in each power amplifier device receives the digital audio signal, if it is determined that the digital audio signal needs to be played under the control of the power amplifier module in the power amplifier device where the slave bus transceiver is located, the digital audio data of each frame contained in the digital audio signal is directly forwarded to each power amplifier module, so as to implement audio playing. Otherwise, the digital audio signal is forwarded to the slave bus transceiver of the next power amplifier device until the complete audio is played. Therefore, the audio playing system provided by the embodiment of the invention can support a plurality of power amplifier devices to play audio together.
In addition, if a new power amplifier device needs to be expanded in the audio playing system, the expansion of the power amplifier device can be realized only by connecting the output interface of the slave bus transceiver in the last current power amplifier device with the input interface of the slave bus transceiver in the new power amplifier device through a digital audio bus. Therefore, the audio playing system has strong expandability.
Referring to fig. 6, a flow chart of a third audio playing method provided in the embodiment of the present invention further includes the following steps S208-S211, compared with the foregoing embodiment shown in fig. 2.
S208: the controller 101A sends configuration parameters and/or control commands to the host bus transceiver 101B.
Specifically, the controller 101A may send configuration parameters and/or control commands to the master bus transceiver 101B via the I2C bus.
The configuration parameter may be a parameter for configuring attributes of the power amplifier module 102B, such as an interface mode, an output power, and an output gain. The control command may be a command for controlling the power amplifier module 102B to perform initialization configuration on itself.
S209: the master bus transceiver 101B forwards configuration parameters and/or control commands to the slave bus transceiver 102A via a digital audio bus.
Specifically, if the audio playing system includes 1 power amplifier device 102, the master bus transceiver 101B may directly forward the configuration parameters and/or the control command to the slave bus transceiver 102A of the power amplifier device 102.
If the audio playing device includes a plurality of power amplifying devices 102, the master bus transceiver 101B may forward the configuration parameters and/or the control command to the slave bus transceiver 102A of each power amplifying device 102.
S210: the slave bus transceiver 102A forwards the configuration parameters and/or the control command to the power amplifier module 102B.
Specifically, the slave bus transceiver 102A forwards the configuration parameters and/or the control command to the power amplifier module 102B located in the same power amplifier device 102 as the slave bus transceiver. The slave bus transceiver 102A may forward the configuration parameters and/or control commands to the power amplifier module 102B via the I2C bus.
S211: the power amplifier module 102B configures itself according to the configuration parameters and/or the control command.
Specifically, after the power amplifier module 102B completes configuration of itself, a configuration completion signal may be fed back to the controller 101A. The configuration completion signal may be forwarded to the controller 101A sequentially via the slave bus transceiver 102A and the master bus transceiver 101B. So that the controller 101A can determine that the power amplifier module 102B is configured, and then transmit the digital audio signal.
Therefore, before the controller sends the digital audio signal, the configuration parameters and/or the control command are sent to the power amplifier module, the power amplifier module completely configures the power amplifier module, namely after the configuration preparation for controlling the loudspeaker to play the audio is completed, the controller sends the digital audio signal again, and the stability of playing the audio can be improved.
Referring to fig. 7A, a flowchart of a fourth audio playing method according to an embodiment of the present invention is shown, which further includes the following steps S212 to S215, compared to the foregoing embodiment shown in fig. 2.
S212: the controller 101A transmits a communication setup signal to the host bus transceiver 101B.
Specifically, the controller 101A may send a communication setup signal to the master bus transceiver 101B via the I2C bus.
S213: the master bus transceiver 101B forwards a communication setup signal to the slave bus transceiver 102A via the digital audio bus.
Specifically, if the audio playing system includes 1 power amplifier device 102, the master bus transceiver 101B may directly forward a communication establishment signal to the slave bus transceiver 102A of the power amplifier device 102.
If the audio playing device includes a plurality of power amplifying devices 102, the master bus transceiver 101B may forward the communication establishing signal to the slave bus transceiver 102A of each power amplifying device 102.
S214: the slave bus transceiver 102A transmits a feedback signal to the master bus transceiver 101B through the digital audio bus for the communication setup signal.
The feedback signal is used to indicate that the communication establishment signal has been received from the bus transceiver 102A.
S215: the master bus transceiver 101B forwards the feedback signal to the controller 101A.
Specifically, the master bus transceiver 101B may send a feedback signal to the controller 101A via the I2C bus.
Compared to the foregoing embodiment shown in fig. 2, the above step S201 can be implemented by the following step S201A.
S201A: the controller 101A transmits a digital audio signal to the master bus transceiver 101B upon receiving the feedback signal.
Specifically, if the controller 101A can receive the feedback signal, it is described that the communication establishment signal is successfully transmitted to the slave bus transceiver 102A, and the feedback signal generated by the slave bus transceiver 102A is also successfully transmitted to the controller 101A, which is described that the controller 101A and the slave bus transceiver 102A are in channel communication, and then the controller 101A can start transmitting the digital audio signal.
As can be seen from the above, the controller transmits the communication establishment signal to the slave bus transceiver before transmitting the digital audio signal, and the slave bus transceiver transmits the feedback signal to the controller after receiving the communication establishment signal, so as to prove that the slave bus transceiver has received the communication establishment signal. After the controller receives the feedback signal, the channel communication between the controller and the slave bus transceiver is determined, and data transmission can be smoothly carried out. On the basis, the controller sends the digital audio signal again, so that the success rate of the digital audio signal transmitted to the slave bus transceiver can be improved, and audio playing can be completed. Therefore, the success rate of audio playing of the audio playing system can be improved.
In an embodiment of the present invention, before the controller 101A sends the digital audio signal, an initialization command may also be sent to the master bus controller 101B, the master bus controller 101B forwards the initialization command to the slave bus controller 102A through the digital audio bus, the slave bus controller 102A forwards the initialization command to the power amplifier module 102B, and the power amplifier module initializes itself according to the initialization command.
Referring to fig. 7B, which is a schematic structural diagram of a vehicle-mounted audio playing system according to an embodiment of the present invention, compared with fig. 5, the audio playing system is installed in a vehicle, the control device may be an IHU, the digital audio bus is an A2B bus, the master bus transceiver is a master A2B bus transceiver, the slave bus transceiver is a slave A2B bus transceiver, the power supply is a vehicle-mounted battery, and the power amplifier device includes 4 power amplifier modules.
Corresponding to the audio playing system, the embodiment of the invention also provides a control device.
Referring to fig. 8, a schematic structural diagram of a control device according to an embodiment of the present invention is provided, where the control device includes a controller 801 and a master bus transceiver 802, where the master bus transceiver 802 is used to connect with a slave bus transceiver in a power amplifier device through a digital audio bus, and the power amplifier device further includes: and a power amplifier module.
Referring to fig. 9, a flowchart of a method for controlling an audio playback of a device according to an embodiment of the present invention includes the following steps S901 to S902.
S901: the controller 801 sends digital audio signals to the main bus transceiver 802.
Wherein, the digital audio signal has recorded therein: and the corresponding relation between each frame of digital audio data and the output channel of the power amplifier module.
S902: the master bus transceiver 802 transmits the digital audio signal to the slave bus transceiver through the digital audio bus, so that the power amplifier module controls to play the digital audio signal.
Specifically, the steps executed by the control device in the process of playing the audio are similar to the steps executed by the control device in the audio playing system, and are not described again in the embodiment of the present invention.
As can be seen from the above, the digital audio signal includes the corresponding relationship between each frame of digital audio data and the output channel, so that each frame of digital audio data can be forwarded to the power amplifier module to which the output channel corresponding to the digital audio data belongs, and the power amplifier module can control the speaker corresponding to the output channel to play the audio data, thereby implementing audio playing through the embodiment of the present invention. And because the control equipment is connected with the power amplifier equipment through only one digital audio bus, the connection mode is simpler, and the complexity of the connection between the control equipment and the power amplifier equipment is lower.
In an embodiment of the present invention, the controller 801 is further configured to send configuration parameters and/or a control command for configuring the power amplifier module to the main bus transceiver 802;
the master bus transceiver 802 is further configured to receive the configuration parameters and/or the control command, and forward the configuration parameters and/or the control command to the slave bus transceiver through the digital audio bus, so that the power amplifier module configures itself according to the configuration parameters and/or the control command.
Therefore, before the controller sends the digital audio signal, the configuration parameters and/or the control command are sent to the power amplifier module, the power amplifier module completely configures the power amplifier module, namely after the configuration preparation for controlling the loudspeaker to play the audio is completed, the controller sends the digital audio signal again, and the stability of playing the audio can be improved.
In an embodiment of the present invention, the controller 801 is further configured to send a communication setup signal to the master bus transceiver 802;
the master bus transceiver 802 is further configured to receive the communication establishment signal, forward the communication establishment signal to the slave bus transceiver through the digital audio bus, receive a feedback signal for the communication establishment signal sent by the slave bus transceiver through the digital audio bus, and forward the feedback signal to the controller 801;
the controller 801 is specifically configured to send a digital audio signal to the master bus transceiver 802 upon receiving the feedback signal.
As can be seen from the above, the controller transmits the communication establishment signal to the slave bus transceiver before transmitting the digital audio signal, and the slave bus transceiver transmits the feedback signal to the controller after receiving the communication establishment signal, so as to prove that the slave bus transceiver receives the communication establishment signal. After the controller receives the feedback signal, the channel communication between the controller and the slave bus transceiver is determined, and data transmission can be smoothly carried out. On the basis, the controller sends the digital audio signal again, so that the success rate of the digital audio signal transmitted to the slave bus transceiver can be improved, and audio playing can be completed. Therefore, the success rate of the audio playing system for audio playing can be improved.
Fig. 10 is a schematic structural diagram of a power amplifier device according to an embodiment of the present invention. The power amplifier device comprises a slave bus transceiver 1001 and at least one power amplifier module 1002.
The slave bus transceiver 1001 is used to connect with a master bus transceiver in the control device through a digital audio bus.
Referring to fig. 11, a schematic flow chart of an audio playing method for a power amplifier device according to an embodiment of the present invention includes the following steps S1101-S1104.
S1101: the slave bus transceiver 1001 receives a digital audio signal transmitted by the master bus transceiver through a digital audio bus.
S1102: the slave bus transceiver 1001 forwards each frame of digital audio data included in the digital audio signal to the power amplifier module to which the corresponding output channel belongs according to the correspondence between each frame of digital audio data recorded in the digital audio signal and the output channel of the power amplifier module.
S1103: the power amplifier module 1002 distributes the digital audio data to the corresponding output channels according to the corresponding relationship.
S1104: the power amplifier module 1002 performs digital-to-analog conversion on the digital audio data, and controls the speakers corresponding to the output channels to play the converted audio data.
Specifically, the steps executed by the power amplifier device in the process of playing the audio are similar to the steps executed by the power amplifier device in the audio playing system, and are not described again in the embodiments of the present invention.
As can be seen from the above, the digital audio signal includes the corresponding relationship between each frame of digital audio data and the output channel, so that the bus transceiver can forward each frame of digital audio data to the power amplifier module to which the output channel corresponding to the digital audio data belongs, and the power amplifier module can control the speaker corresponding to the output channel to play the audio data, so that audio playing can be implemented by the audio playing system provided in the embodiment of the present invention. And because the control equipment is connected with the power amplifier equipment through only one digital audio bus, the connection mode is simpler, and the complexity of the connection between the control equipment and the power amplifier equipment is lower.
In an embodiment of the present invention, the power amplifier device further includes: the switch component is respectively connected with the digital audio bus, the power supply, the slave bus transceiver 1001 and the power amplifier module 1002;
the switch component is used for receiving a power supply control signal sent by the control equipment through the digital audio bus and controlling the power supply to be switched on and off with the slave bus transceiver 1001 and the power amplifier module 1002.
In one embodiment of the invention, the switch assembly comprises an optical coupling sensor, an electronic switch and a DCDC power supply;
an anode and a cathode of the optical coupling sensor are respectively connected with two sub-buses included in the digital audio bus, an emitter of the optical coupling sensor is connected with a first end of the electronic switch, a collector of the optical coupling sensor is connected with a second end of the electronic switch, the first end of the electronic switch is connected with the power supply, a third end of the electronic switch is connected with the DCDC power supply and the power amplification module 1002, and the DCDC power supply is connected with the slave bus transceiver 1001;
the optical coupling sensor is used for sending an enabling signal to the electronic switch through the emitter and the collector after receiving the power supply control signal;
and the electronic switch is used for controlling the connection or disconnection between the first end and the third end according to the enabling signals received by the first end and the second end.
Therefore, the control equipment can directly control the on-off of the switch component by sending the power supply control signal so as to control the on-off state of the power amplifier module and the slave bus transceiver. Therefore, if the control equipment needs to play audio through the power amplifier equipment, the power amplifier module and the slave bus transceiver can be directly controlled to be electrified, and then audio playing is achieved. If the control equipment stops playing the audio, the power amplifier module and the slave bus transceiver can be directly controlled to be powered off, and audio playing is not performed any more. Therefore, the mode for controlling the power on/off states of the power amplifier module and the slave bus transceiver in the audio playing system provided by the embodiment of the invention is simpler. In addition, the power on-off states of the power amplifier module and the slave bus transceiver in the power amplifier device are controlled by the controller, so that a processing device for storing and operating programs for controlling the power on-off states of the power amplifier module and the slave bus transceiver is not required to be installed in the power amplifier device, and the structure of the power amplifier device is simple.
In an embodiment of the present invention, an output interface of the slave bus transceiver is connected to an input interface of the slave bus transceiver 1001 of the next power amplifier device through a digital audio bus;
the slave bus transceiver 1001 is specifically configured to:
receiving the digital audio signal;
if the power amplifier module 1002 in the power amplifier device where the slave bus transceiver 1001 is located controls to play the digital audio signal, forwarding each frame of digital audio data contained in the digital audio signal to the power amplifier module 1002 to which the corresponding output channel belongs according to the correspondence recorded in the digital audio signal;
otherwise, the digital audio signal is transmitted from the output interface of the slave bus transceiver 1001 to the slave bus transceiver 1001 in the next power amplifier device through the digital audio bus.
It can be seen from the above that, each power amplifier device is connected in series, and after the slave bus transceiver in each power amplifier device receives the digital audio signal, if it is determined that the digital audio signal needs to be played under the control of the power amplifier module in the power amplifier device where the slave bus transceiver is located, the digital audio data of each frame contained in the digital audio signal is directly forwarded to each power amplifier module, so as to implement audio playing. Otherwise, the digital audio signal is forwarded to the slave bus transceiver of the next power amplifier device until the complete audio is played. Therefore, the audio playing system provided by the embodiment of the invention can support a plurality of power amplifier devices to play audio together.
In addition, if a new power amplifier device needs to be expanded, the expansion of the power amplifier device can be realized only by connecting the output interface of the slave bus transceiver in the last current power amplifier device with the input interface of the slave bus transceiver in the new power amplifier device through a digital audio bus.
In an embodiment of the present invention, the slave bus transceiver 1001 is further configured to receive configuration parameters and/or control commands sent by the master bus transceiver through the digital audio bus, and forward the configuration parameters and/or control commands to the power amplifier module 1002;
the power amplifier module 1002 is further configured to receive the configuration parameters and/or the control command, and configure itself according to the configuration parameters and/or the control command.
It can be seen from the above that, before the control device sends the digital audio signal, the configuration parameter and/or the control command is sent to the power amplifier module, the power amplifier module completely configures itself, that is, after the configuration preparation for controlling the loudspeaker to play the audio is completed, the controller sends the digital audio signal again, so that the stability of playing the audio can be improved.
In an embodiment of the present invention, the slave bus transceiver 1001 is further configured to receive a communication setup signal sent by the master bus transceiver through the digital audio bus, and send a feedback signal to the master bus transceiver through the digital audio bus for the communication setup signal.
As can be seen from the above, the control device sends the communication establishment signal to the slave bus transceiver before sending the digital audio signal, and the slave bus transceiver sends the feedback signal to the control device after receiving the communication establishment signal, so as to prove that the control device has received the communication establishment signal. After the control equipment receives the feedback signal, the channel communication between the control equipment and the slave bus transceiver can be determined, and data transmission can be carried out smoothly. On the basis, the control equipment sends the digital audio signal again, so that the success rate of transmitting the digital audio signal to the slave bus transceiver can be improved, and audio playing can be completed. Therefore, the success rate of audio playing of the power amplifier equipment can be improved.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. Particularly, for the control device and the power amplifier device, since they are basically similar to the system embodiment, the description is simple, and the relevant points can be referred to the partial description of the system embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (11)

1. An audio playback system, the system comprising: the power amplifier device comprises a slave bus transceiver and at least one power amplifier module, and the master bus transceiver is connected with the slave bus transceiver through a digital audio bus;
the controller is configured to send a digital audio signal to the main bus transceiver, where the digital audio signal has recorded therein: the corresponding relation between each frame of digital audio data and the output channel of the power amplifier module;
the master bus transceiver is used for receiving the digital audio signal and transmitting the digital audio signal to the slave bus transceiver through the digital audio bus;
the slave bus transceiver is used for receiving the digital audio signals and forwarding each frame of digital audio data contained in the digital audio signals to the power amplifier module to which the corresponding output channel belongs according to the corresponding relation recorded in the digital audio signals;
the power amplifier module is used for receiving the digital audio data sent by the bus transceiver, distributing the digital audio data to the corresponding output channels according to the corresponding relation, performing digital-to-analog conversion on the digital audio data, and controlling the loudspeakers corresponding to the output channels to play the converted audio data;
the power amplifier device further includes: the switch assembly is respectively connected with the digital audio bus, the power supply, the slave bus transceiver in the power amplifier equipment and the power amplifier module in the power amplifier equipment;
the controller is also used for sending a power supply control signal through the digital audio bus so as to control the power supply to be switched on and off with the slave bus transceiver and the power amplifier module in the power amplifier equipment through the switch component;
the switch assembly comprises an optical coupling sensor, an electronic switch and a DCDC power supply;
an anode and a cathode of the optical coupler sensor are respectively connected with two sub-buses contained in the digital audio bus, an emitter of the optical coupler sensor is connected with a first end of the electronic switch, a collector of the optical coupler sensor is connected with a second end of the electronic switch, the first end of the electronic switch is connected with the power supply, a third end of the electronic switch is connected with the DCDC power supply and a power amplification module of the power amplification equipment, and the DCDC power supply is connected with a slave bus transceiver in the power amplification equipment;
the optical coupling sensor is used for sending an enabling signal to the electronic switch through the emitter and the collector after receiving the power supply control signal;
and the electronic switch is used for controlling the connection or disconnection between the first end and the third end according to the enabling signals received by the first end and the second end.
2. The system of claim 1, wherein when the number of the power amplifier devices is greater than 1, the power amplifier devices are connected in series, an output interface of the slave bus transceiver in each power amplifier device except the last power amplifier device is connected to an input interface of the slave bus transceiver in the next power amplifier device through a digital audio bus, and an output interface of the master bus transceiver is connected to an input interface of the slave bus transceiver in the first power amplifier device through a digital audio bus;
the slave bus transceiver is specifically configured to:
receiving the digital audio signal;
if the power amplifier module in the power amplifier equipment where the slave bus transceiver is located controls to play the digital audio signals, forwarding each frame of digital audio data contained in the digital audio signals to the power amplifier module to which the corresponding output channel belongs according to the corresponding relation recorded in the digital audio signals;
otherwise, the digital audio signal is sent to the slave bus transceiver in the next power amplifier equipment from the output interface of the slave bus transceiver through the digital audio bus.
3. The system according to any one of claims 1-2,
the controller is also used for sending configuration parameters and/or control commands to the master bus transceiver;
the master bus transceiver is also used for receiving the configuration parameters and/or the control commands, and forwarding the configuration parameters and/or the control commands to the slave bus transceiver through the digital audio bus;
the slave bus transceiver is also used for receiving the configuration parameters and/or the control commands and forwarding the configuration parameters and/or the control commands to the power amplifier module;
and the power amplifier module is also used for receiving the configuration parameters and/or the control commands and configuring the power amplifier module according to the configuration parameters and/or the control commands.
4. The system of any one of claims 1-2,
the controller is also used for sending a communication establishment signal to the main bus transceiver;
the master bus transceiver is further used for receiving the communication establishment signal and forwarding the communication establishment signal to the slave bus transceiver through the digital audio bus;
the slave bus transceiver is further used for receiving the communication establishment signal and sending a feedback signal to the master bus transceiver through the digital audio bus aiming at the communication establishment signal;
the master bus transceiver is also used for receiving the feedback signal and forwarding the feedback signal to the controller;
the controller is specifically configured to send a digital audio signal to the master bus transceiver upon receiving the feedback signal.
5. The utility model provides a control device, its characterized in that contains controller and master bus transceiver in the control device, master bus transceiver is arranged in connecting with the slave bus transceiver in the power amplifier equipment through digital audio bus, power amplifier equipment still includes: a power amplifier module;
the controller is configured to send a digital audio signal to the main bus transceiver, where the digital audio signal has recorded therein: the corresponding relation between each frame of digital audio data and the output channel of the power amplifier module;
the master bus transceiver is used for receiving the digital audio signal and sending the digital audio signal to the slave bus transceiver through the digital audio bus so that the power amplification module controls the digital audio signal to be played;
the power amplifier device further comprises: the switch assembly is respectively connected with the digital audio bus, the power supply, the slave bus transceiver in the power amplifier equipment and the power amplifier module in the power amplifier equipment;
the controller is also used for sending a power supply control signal through the digital audio bus so as to control the power supply to be switched on and off with the slave bus transceiver and the power amplifier module in the power amplifier equipment through the switch component;
the switch assembly comprises an optical coupling sensor, an electronic switch and a DCDC power supply;
an anode and a cathode of the optical coupling sensor are respectively connected with two sub-buses contained in the digital audio bus, an emitter of the optical coupling sensor is connected with a first end of the electronic switch, a collector of the optical coupling sensor is connected with a second end of the electronic switch, the first end of the electronic switch is connected with the power supply, a third end of the electronic switch is connected with the DCDC power supply and a power amplification module of the power amplification equipment, and the DCDC power supply is connected with a slave bus transceiver in the power amplification equipment;
the optical coupling sensor is used for sending an enabling signal to the electronic switch through the emitter and the collector after receiving the power supply control signal;
and the electronic switch is used for controlling the connection or disconnection between the first end and the third end according to the enabling signals received by the first end and the second end.
6. The control apparatus according to claim 5,
the controller is further configured to send configuration parameters and/or control commands for configuring the power amplifier module to the master bus transceiver;
the master bus transceiver is further configured to receive the configuration parameters and/or the control commands, and forward the configuration parameters and/or the control commands to the slave bus transceiver through the digital audio bus, so that the power amplifier module configures itself according to the configuration parameters and/or the control commands.
7. The control apparatus according to claim 5 or 6,
the controller is also used for sending a communication establishment signal to the main bus transceiver;
the master bus transceiver is further configured to receive the communication establishment signal, forward the communication establishment signal to the slave bus transceiver through the digital audio bus, receive a feedback signal for the communication establishment signal, which is sent by the slave bus transceiver through the digital audio bus, and forward the feedback signal to the controller;
the controller is specifically configured to send a digital audio signal to the master bus transceiver upon receiving the feedback signal.
8. A power amplifier device is characterized in that the power amplifier device comprises a slave bus transceiver and at least one power amplifier module, wherein the slave bus transceiver is used for being connected with a master bus transceiver in a control device through a digital audio bus;
the slave bus transceiver is used for receiving digital audio signals sent by the master bus transceiver through a digital audio bus, and forwarding each frame of digital audio data contained in the digital audio signals to the power amplifier module to which the corresponding output channel belongs according to the corresponding relation between each frame of digital audio data recorded in the digital audio signals and the output channel of the power amplifier module;
the power amplifier module is used for receiving the digital audio data sent by the bus transceiver, distributing the digital audio data to the corresponding output channels according to the corresponding relation, performing digital-to-analog conversion on the digital audio data, and controlling the loudspeakers corresponding to the output channels to play the converted audio data;
the power amplifier device further includes: the switch assembly is respectively connected with the digital audio bus, the power supply, the slave bus transceiver and the power amplifier module;
the switch component is used for receiving a power supply control signal sent by the control equipment through the digital audio bus and controlling the power supply to be switched on and off with the slave bus transceiver and the power amplifier equipment;
the switch assembly comprises an optical coupling sensor, an electronic switch and a DCDC power supply;
an anode and a cathode of the optical coupling sensor are respectively connected with two sub-buses contained in the digital audio bus, an emitter of the optical coupling sensor is connected with a first end of the electronic switch, a collector of the optical coupling sensor is connected with a second end of the electronic switch, the first end of the electronic switch is connected with the power supply, a third end of the electronic switch is connected with the DCDC power supply and a power amplification module of the power amplification equipment, and the DCDC power supply is connected with the slave bus transceiver;
the optical coupling sensor is used for sending an enabling signal to the electronic switch through the emitter and the collector after receiving the power supply control signal;
and the electronic switch is used for controlling the connection or disconnection between the first end and the third end according to the enabling signals received by the first end and the second end.
9. The power amplifier device according to claim 8, wherein an output interface of the slave bus transceiver is connected to an input interface of the next power amplifier device slave bus transceiver through a digital audio bus;
the slave bus transceiver is specifically configured to:
receiving the digital audio signal;
if the power amplifier module in the power amplifier equipment where the slave bus transceiver is located controls to play the digital audio signals, forwarding each frame of digital audio data contained in the digital audio signals to the power amplifier module to which the corresponding output channel belongs according to the corresponding relation recorded in the digital audio signals;
otherwise, the digital audio signal is sent to the slave bus transceiver in the next power amplifier equipment from the output interface of the slave bus transceiver through the digital audio bus.
10. The power amplifier device according to any of claims 8-9,
the slave bus transceiver is also used for receiving configuration parameters and/or control commands sent by the master bus transceiver through the digital audio bus and forwarding the configuration parameters and/or the control commands to the power amplifier module;
and the power amplifier module is also used for receiving the configuration parameters and/or the control commands and configuring the power amplifier module according to the configuration parameters and/or the control commands.
11. The power amplifier device according to any of claims 8-9,
the slave bus transceiver is also used for receiving a communication establishment signal sent by the master bus transceiver through the digital audio bus, and sending a feedback signal to the master bus transceiver through the digital audio bus aiming at the communication establishment signal.
CN202110569469.7A 2021-05-25 2021-05-25 Audio playing system, control equipment and power amplifier equipment Active CN113301494B (en)

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