CN111988703A - Audio processor and audio processing method - Google Patents
Audio processor and audio processing method Download PDFInfo
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- CN111988703A CN111988703A CN201910423755.5A CN201910423755A CN111988703A CN 111988703 A CN111988703 A CN 111988703A CN 201910423755 A CN201910423755 A CN 201910423755A CN 111988703 A CN111988703 A CN 111988703A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/16—Sound input; Sound output
- G06F3/165—Management of the audio stream, e.g. setting of volume, audio stream path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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Abstract
The invention relates to an audio processor and an audio processing method, wherein the processor comprises: the system comprises an analog input unit, a network input unit, an analog output unit, a network output unit and an audio selection unit, wherein the analog input unit selects an input audio signal and outputs the selected audio signal to the analog output unit and/or the network output unit; the audio processing unit receives the audio signals of the analog receiving unit and the network receiving unit, processes the audio signals and transmits the audio signals to the audio selection unit; the audio selection unit can receive and select the audio signals directly output by the analog input unit and the network input unit, and can also receive and select the audio signals processed by the audio processing unit. The invention can simultaneously receive the analog audio signal and the network audio signal, select the analog audio output or the network output according to the use requirement, and more truly build the sound effect from far to near by processing the audio signal.
Description
Technical Field
The invention relates to the technical field of audio transmission.
Background
Existing audio transmission systems are mainly classified into two types, one is an analog system and the other is a digital system. In an analog system, audio transmission, switching and selection, volume attenuation and increase are all achieved in a purely analog manner, which is suitable for short-distance audio transmission with fewer audio channels. In the existing digital system, the processing of the audio signal is not limited to the analog technology, but both the audio transmission link and the processing link are realized by the digital technology, such as the bluetooth technology and the ethernet technology; this is suitable for multi-channel audio and long-distance transmission because digital signals are not prone to attenuation and sudden change during transmission, and the transmission bandwidth can be large, such as gigabit ethernet.
The conventional analog transmission system is easily interfered by surrounding electromagnetic waves and the like because the whole system is composed of analog devices, and if the system is transmitted in a long distance, the self-loss of an analog line inevitably occurs, and when the number of audio tracks is increased, the wiring of the audio tracks is very troublesome, and meanwhile, the maintenance cost is also greatly increased.
In the existing digital transmission system, a part of digital systems transmit compressed audio, so that a receiving end is required to be provided with a special audio decoding circuit, which inevitably increases the product cost; in addition, the quality of the decoding circuit determines the quality of the audio output and the user experience, which can lead to the uneven quality of the digital audio transmission products on the market; the other part of the digital system transmits uncompressed audio, and compared with a digital system transmitting compressed audio, the system has the advantages that the tone quality and the user experience are greatly improved, the professional level is achieved, and meanwhile, multi-channel audio can be transmitted; the digital systems also have some defects, firstly, most of the digital systems are plaintext transmission, which easily causes the audio transmission to be flooded and cannot well protect the rights and interests of original audio authors; moreover, each track of audio frequency of transmission is the original audio frequency of single track, if the user needs to experience the effect that multi-track audio frequency brought, need be equipped with a plurality of speakers, and the locating position of speaker also has the requirement, and this can bring a great deal of inconvenience for user experience.
When constructing each position sound field, the most common practice at present is to place a sound box in each position, such as left front/right front position, intermediate position, right back/left back position, ceiling position, etc., respectively, if the place is great, then in order to reach the purpose that every position sound effect experience is unanimous, the quantity of placing the sound box will be many, and the line connection will also be very complicated.
Disclosure of Invention
In order to solve the above problems, the present invention provides an audio processor and an audio processing method, which process an input audio signal to realize sound field enclosure, and a user can select a desired single-track audio and output mode from a transmitted audio stream according to a use requirement to experience, thereby increasing a degree of freedom of user selection.
The invention relates to an audio processor, comprising: the analog input unit is used for receiving an analog audio signal and performing analog-to-digital conversion on the analog audio signal;
the network input unit is used for receiving the network audio signals and analyzing the audio of each track from the network audio signals;
an analog output unit which converts the digital audio signal into an analog audio signal and outputs the analog audio signal;
a network output unit that outputs a digital audio signal; and
An audio selection unit which selects an input audio signal and outputs the selected audio signal to the analog output unit and/or the network output unit;
the audio processing unit receives the audio signals of the analog receiving unit and the network receiving unit, processes the audio signals and transmits the processed audio signals to the audio selecting unit;
the audio selection unit can receive and select audio signals directly output by the analog input unit and the network input unit, and can also receive and select audio signals processed by the audio processing unit.
Preferably, the audio processing unit comprises a first audio processing module and a second audio processing module; the first audio processing module receives and processes the audio signal of the analog receiving module; the second audio processing module receives and processes the audio signal of the network receiving module.
Preferably, the first audio processing module and the second audio processing module respectively include a plurality of higher-order FIR filters and a weighting module, and the plurality of higher-order FIR filters have the same order and different frequency responses; the weighting module synthesizes the audio signals into two-track audio signals.
Preferably, the audio selection unit comprises a first audio selection module and a second audio selection module; the first audio selection module receives the audio signal processed by the audio processing unit; the second audio selection module receives audio signals transmitted by the analog input unit and the network input unit.
Preferably, the audio processor of the present invention further includes a copyright protection unit, which performs copyright protection on the audio signal transmitted by the audio selection unit and transmits the audio signal to the network output unit.
Preferably, the network input unit includes a first PHY module, an IP receiving module, and an audio parsing module; the network output unit comprises a second PHY module and an IP sending module; the first PHY module is connected with an external network; the IP receiving module is used for receiving the network audio signal transmitted by the first PHY module; the audio analysis module analyzes the network audio signals received by the IP receiving module to obtain the audio of each track and carries out sound effect synthesis processing.
Preferably, the audio analysis module includes an audio clock recovery module and a clock module, and the audio clock recovery module performs algorithm processing on the audio clock according to the jitter condition of the network clock to recover the stable audio clock.
Preferably, the audio processor of the present invention further includes a PHY configuration unit that completes configuration of the first PHY module and the second PHY module.
Preferably, the analog input unit comprises an 8-track analog audio input, wherein 6-track analog audio is converted into a digital signal after analog-to-digital conversion, and the remaining 2-track analog audio is used for expansion.
Preferably, the hardware platform is an FPGA chip.
The invention also relates to an audio transmission method, which comprises the following steps:
receiving an analog audio signal and performing analog-to-digital conversion on the analog audio signal;
receiving network audio signals and analyzing the audio of each track from the network audio signals;
processing the received analog audio signal and the network audio signal;
carrying out output selection on the received analog audio signal, the network audio signal and the processed audio signal;
when the analog signal is selected to be output, converting the digital audio signal into an analog audio signal and outputting the analog audio signal;
when the network signal output is selected, the digital audio signal is directly output.
Preferably, the step of receiving the network audio signal and analyzing the audio of each track from the network audio signal includes performing algorithm processing on the audio clock according to the jitter condition of the network clock by the module, and recovering the stable audio clock.
The audio processor and the audio transmission method can simultaneously receive the analog audio signal and the network audio signal, select the analog audio output or the network output according to the use requirement, surround a sound field by processing the audio signal, show more sound details, present a dynamic sound effect and really build a sound effect from far to near.
Drawings
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings, which are for the purpose of illustrating preferred embodiments of the invention and not for the purpose of limiting the same. In the drawings, there is shown in the drawings,
FIG. 1 is a functional block diagram of an audio processor according to an embodiment of the present invention;
fig. 2 is a flow chart of an audio processing method according to an embodiment of the invention.
Detailed Description
The present invention is described in more detail with reference to the following examples, but the present invention is not limited to the examples.
The audio processor of the invention preferably uses a field programmable gate array FPGA chip for hardware development.
Fig. 1 is a functional block diagram of an audio processor according to an embodiment of the present invention.
As shown in fig. 1, the audio processor of the present embodiment includes an analog input unit, a network input unit, an analog output unit, a network output unit, and an audio selection unit.
And the analog input unit is used for receiving the analog audio signal and carrying out analog-to-digital conversion on the analog audio signal. The analog input unit comprises an analog-to-digital converter and an audio receiving module, the analog-to-digital converter receives an externally input analog audio signal, converts the analog audio signal into a digital audio signal and outputs the digital audio signal to the audio receiving module, and the audio receiving module receives the converted digital audio signal and transmits the digital audio signal to the audio selecting unit.
And the network input unit is used for receiving the network audio signal and analyzing the audio of each track from the network audio signal. The network input unit comprises a first PHY module, an IP receiving module and an audio analysis module; the first PHY module is connected with an external network and receives a digital audio signal of the external network; the IP receiving module is used for receiving the network audio signal transmitted by the first PHY module; the audio analysis module analyzes the network audio signals received by the IP receiving module to obtain the audio of each track and carries out sound effect synthesis processing.
And the audio selection unit receives and selects the audio signals output by the analog input unit and the network input unit and outputs the selected audio signals to the analog output unit and/or the network output unit. The audio selection unit selects one audio from the analog input audio and the network input audio, and the audio is output through the analog interface and can be output through the network at the same time for being used by the subsequent equipment.
And an analog output unit which converts the digital audio signal into an analog audio signal and outputs the analog audio signal. The analog output unit comprises an audio sending module and a digital-to-analog converter, wherein the audio sending module receives the audio signal transmitted by the audio selecting unit, converts the audio signal into an analog audio signal through the digital-to-analog converter and outputs the analog audio signal to the rear-stage equipment.
A network output unit that outputs a digital audio signal; the network output unit includes a second PHY module and an IP transmission module. The IP sending module receives the audio signal selected by the audio selection unit, transmits the audio signal to the second PHY module through the IP sending module, and outputs the audio signal to the post-stage equipment.
Through the audio processor of the embodiment, a user can select required single-track audio and an output mode from the transmitted audio stream according to use requirements to experience, and the freedom degree of selection of the user is increased.
As a preferred embodiment of the present invention, the audio processor of this embodiment further includes an audio processing unit, which receives the audio signals from the analog receiving unit and the network receiving unit, processes the audio signals, and transmits the processed audio signals to the audio selecting unit.
The audio selection unit can receive and select the audio signals directly output by the analog input unit and the network input unit, and can also receive and select the audio signals processed by the audio processing unit.
Further, the audio processing unit comprises a first audio processing module and a second audio processing module; the first audio processing module receives and processes the audio signal of the analog receiving module; the second audio processing module receives and processes the audio signal of the network receiving module.
The first audio processing module and the second audio processing module respectively comprise a plurality of high-order FIR filters and weighting modules, and the high-order FIR filters have the same order and different frequency responses; the weighting module synthesizes the audio signals into two-track audio signals.
The input of the audio processing unit is six-track audio data which are respectively as follows: left, right, left back, right back, middle, low frequency equal sound track; and outputting the left and right sound channel two-track data surrounded by the sound field. After the six-track audio data enter the audio processing unit, the six-track audio data respectively enter corresponding high-order FIR filters for filtering operation, the orders of the filters are the same, but the frequency responses of the filters are different, the filtering operation changes the phase of an input audio stream, and the directional sense of an audio signal is increased; the output signals of the filter are still six-track audio signals and are processed by the weighting module, the six-track audio signals are combined into two-track audio signals by the weighting module in a weighting summation mode, and in the weighting summation process of the surrounding sound channels of the left sound field and the right sound field, the weight values of all the six-track audio signals are smaller than one, so that the value cannot overflow after summation.
The analog input unit comprises 8-track analog audio input, wherein 6-track analog audio is converted into a digital signal after analog-to-digital conversion, and the rest 2-track analog audio is used for expansion. The 6-track audio frequency converted into the digital signal is subjected to sound effect processing through the first audio processing module, two tracks of six-track independent audio frequency synthesis audio frequency with position and direction information are combined, and when the earphone is used for experiencing, a user can experience the on-the-spot sound effect.
Further, the audio selection unit comprises a first audio selection module and a second audio selection module; the first audio selection module receives the audio signal processed by the audio processing unit; the second audio selection module receives audio signals transmitted by the analog input unit and the network input unit.
As a preferred embodiment of the present invention, the audio processor of this embodiment further includes a copyright protection unit, which performs copyright protection on the audio signal transmitted by the audio selection unit and transmits the audio signal to the network output unit.
Before network audio transmission, the copyright protection unit carries out copyright protection processing on the audio signal through an encryption algorithm, so that no matter the audio is input through a network or output through the network, the audio is encrypted audio stream, and the audio copyright can be well protected.
After receiving the network audio, the hardware platform of this embodiment first performs audio parsing and decryption, restores the encrypted audio stream transmitted over the network to a plaintext audio stream, and separates out the six-track audio, which is convenient for the audio processing unit to process the audio signal. In the process of receiving the network audio stream, network jitter inevitably occurs, and in order to eliminate the influence of the network jitter on the audio experience, clock recovery needs to be performed on the network audio.
Furthermore, the audio analysis module comprises an audio clock recovery module and a clock module, and the audio clock recovery module performs algorithm processing on the audio clock according to the jitter condition of the network clock to recover the stable audio clock. The audio clock is processed by the audio clock recovery module to obtain a stable and reliable audio clock, and adverse effects of network jitter on audio experience are eliminated.
The audio clock recovery module preferably uses a Phase Locked Loop (PLL) within the FPGA chip to phase lock the input clock. Because its internal loop filter can filter the output clock, thereby improving the clock jitter performance.
The audio processor of the present invention further includes a PHY configuration unit that completes the configuration of the first PHY module and the second PHY module. And the configuration functions of the first PHY module and the second PHY module are completed through the PHY configuration unit, so that the first PHY module and the second PHY module can work normally.
The audio processor utilizes the field programmable gate array FPGA to develop hardware, and configures the network interface through the PHY, so that a hardware platform can receive analog audio signals and network audio signals at the same time, and processes the audio signals, thereby increasing the selection of users and improving the experience effect of the audio.
Fig. 2 is a flow chart of an audio processing method according to an embodiment of the invention.
As shown in fig. 2, the present invention also relates to an audio processing method, comprising the steps of:
step S1, receiving the analog audio signal, and performing analog-to-digital conversion on the analog audio signal.
Step S2, receiving the network audio signal, and analyzing the audio of each track from the network audio signal.
Further, in order to eliminate the experience of network jitter on the audio, step S2 further includes step S21, where the audio clock is processed by an algorithm according to the jitter of the network clock, so as to recover a stable audio clock.
In step S4, the received analog audio signal and network audio signal are output and selected.
In step S5, when the analog signal output is selected, the digital audio signal is converted into an analog audio signal and output.
In step S6, when the network signal output is selected, the digital audio signal is directly output.
Further, in order to improve the sound quality, step S3 is further included before selecting the output of the received analog audio signal and the network audio signal in step S4, and the audio signal is processed.
Through the processing to audio signal, with the audio frequency that each independent audio frequency of rail is synthesized two rails and is had position direction information, when using the earphone to experience, the user just can experience the audio effects on the spot.
The audio processing method can simultaneously receive the analog audio signal and the network audio signal, select the analog audio output or the network output according to the use requirement, surround the sound field by processing the audio signal, display more sound details, present dynamic sound effect, really build the sound effect from far to near, and improve the user experience.
Claims (10)
1. An audio processor, comprising:
the analog input unit is used for receiving an analog audio signal and performing analog-to-digital conversion on the analog audio signal;
the network input unit is used for receiving the network audio signals and analyzing the audio of each track from the network audio signals;
an analog output unit which converts the digital audio signal into an analog audio signal and outputs the analog audio signal;
a network output unit that outputs a digital audio signal; and
an audio selection unit which selects an input audio signal and outputs the selected audio signal to the analog output unit and/or the network output unit;
the audio processing unit receives the audio signals of the analog receiving unit and the network receiving unit, processes the audio signals and transmits the processed audio signals to the audio selecting unit;
The audio selection unit can receive and select audio signals directly output by the analog input unit and the network input unit, and can also receive and select audio signals processed by the audio processing unit.
2. The audio processor of claim 1,
the audio processing unit comprises a first audio processing module and a second audio processing module;
the first audio processing module receives and processes the audio signal of the analog receiving module;
and the second audio processing module receives and processes the audio signal of the network receiving module.
3. The audio processor of claim 2,
the first audio processing module and the second audio processing module respectively comprise a plurality of high-order FIR filters and weighting modules,
the plurality of high order FIR filters have the same order and different frequency responses;
and the weighting module synthesizes the audio signals output by the plurality of high-order FIR filters into two-track audio signals.
4. The audio processor of claim 1,
the audio selection unit comprises a first audio selection module and a second audio selection module;
The first audio selection module receives an audio signal processed by the audio processing unit;
the second audio selection module receives audio signals transmitted by the analog input unit and the network input unit.
5. The audio processor according to any one of claims 1 to 4, further comprising a copyright protection unit, configured to transmit the audio signal transmitted by the audio selection unit to the network output unit after performing copyright protection on the audio signal.
6. The audio processor according to any of claims 1-4, wherein the network input unit comprises a first PHY module, an IP reception module, and an audio parsing module; the network output unit comprises a second PHY module and an IP sending module;
the first PHY module is connected with an external network;
the IP receiving module is used for receiving the network audio signal transmitted by the first PHY module;
and the audio analysis module analyzes the network audio signals received by the IP receiving module to obtain the audio of each rail and performs sound effect synthesis processing.
7. The audio processor according to claim 6, wherein the audio parsing module comprises an audio clock recovery module and a clock module, and the audio clock recovery module performs an algorithm process on the audio clock according to a jitter condition of the network clock to recover a stable audio clock.
8. The audio processor of claim 6,
a PHY configuration unit is also included that completes configuration of the first PHY module and the second PHY module.
9. The audio processor according to any one of claims 1 to 4, wherein the analog input unit comprises an 8-track analog audio input, wherein 6-track analog audio is converted into a digital signal after analog-to-digital conversion, and the remaining 2-track analog audio is used for expansion.
10. An audio processing method, comprising the steps of:
receiving an analog audio signal and performing analog-to-digital conversion on the analog audio signal;
receiving network audio signals and analyzing the audio of each track from the network audio signals;
processing the received analog audio signal and the network audio signal;
carrying out output selection on the received analog audio signal, the network audio signal and the processed audio signal;
when the analog signal is selected to be output, converting the digital audio signal into an analog audio signal and outputting the analog audio signal;
when the network signal output is selected, the digital audio signal is directly output.
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