CN112153519A - Bluetooth earphone - Google Patents
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- CN112153519A CN112153519A CN202011146791.0A CN202011146791A CN112153519A CN 112153519 A CN112153519 A CN 112153519A CN 202011146791 A CN202011146791 A CN 202011146791A CN 112153519 A CN112153519 A CN 112153519A
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1091—Details not provided for in groups H04R1/1008 - H04R1/1083
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
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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
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/01—Hearing devices using active noise cancellation
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Telephone Function (AREA)
Abstract
The application provides a bluetooth headset, it includes bluetooth chip, flash memory unit, coding and decoding chip and speaker unit. According to the method and the device, the audio data are stored in the flash memory unit, and the coding and decoding chip is arranged to call the audio data in the flash memory unit for decoding and converting to obtain the corresponding analog audio signal, so that the loudspeaker is driven to realize audio playing according to the analog audio signal. This application can avoid bluetooth headset in bluetooth wireless transmission process because to the compression of lossless audio file code rate or the tone quality loss that data packet lost caused through the mode of directly retrieving audio data from bluetooth headset. From this, the bluetooth headset of this application can avoid the tone quality reduction that processes such as bluetooth wireless transmission lead to under the prerequisite that possesses other bluetooth headset functions, makes the earphone user can experience the music enjoyment of high-quality.
Description
Technical Field
The application relates to the technical field of electronic equipment, in particular to a Bluetooth headset.
Background
Prior to the development of bluetooth headsets, the headsets were typically wired: the earphone is used by plugging into the jack of the mobile phone, MP3 and other equipment. When the audio is played, the equipment end firstly decodes the digital audio source, then converts the digital signal of the audio file into an analog electric signal, and then transmits the analog electric signal to the earphone end through the earphone cable, and the analog signal is amplified and then output in the form of an acoustic signal by a loudspeaker in the earphone, so that the playing is realized.
In recent years, bluetooth headsets have been rapidly developed, and particularly, the advent of TWS (True Wireless Stereo) headsets has enabled users to enjoy music by both ears without being bound by headset wires.
However, when the existing bluetooth headset plays audio, an equipment end matched with the bluetooth headset needs to encode a digital sound source into a lossless audio file at first, and then wirelessly transmit the lossless audio file to a bluetooth headset end in a digital signal mode in a bluetooth transmission mode, so that the digital signal can be decoded by the bluetooth headset end, the digital signal is converted into an analog electrical signal, and finally the analog electrical signal is amplified to be played by a loudspeaker, and corresponding audio is output in an acoustic signal mode.
In the bluetooth playing process, the encoding and decoding processes before playing can delay the audio frequency of the bluetooth headset; moreover, if the code rate of the sound source itself is too large (for example, the sound source is not damaged), the transmission rate of the bluetooth may be exceeded, and at this time, the bluetooth of the device end will reduce the code rate and then transmit, but this will reduce the sound quality of the earphone end; the three, equipment end and earphone end carry out real-time transmission through the bluetooth, and the data packet loss can take place that is difficult to avoid can further influence tone quality. Therefore, the existing bluetooth headset based on wireless transmission generally has poor sound quality.
Disclosure of Invention
This application provides a bluetooth headset to prior art's not enough, and this application storage has the audio data that can supply the codec chip to acquire and carry out the decoding conversion in flash memory unit, and the bluetooth headset of this application can realize the audio playback through directly transferring the audio data in getting flash memory unit to guarantee the tone quality that bluetooth headset exported. The technical scheme is specifically adopted in the application.
First, in order to achieve the above object, a bluetooth headset is provided, which includes: the Bluetooth chip is used for carrying out wireless data interaction with the pairing equipment of the Bluetooth headset; a flash memory unit for storing first audio data; the coding and decoding chip is connected with the flash memory unit and is used for carrying out decoding conversion on the first audio data to obtain a first analog audio signal corresponding to the first audio data; and the loudspeaker unit is connected with the coding and decoding chip and used for responding to the first analog audio signal to play a first audio.
Optionally, the bluetooth headset according to any of the above, further comprising: a wired data interface; the flash memory unit is connected with external electronic equipment through the wired data interface and stores first audio data transmitted by the external electronic equipment through a data line.
Optionally, the bluetooth headset according to any of the above embodiments, wherein the codec chip includes a first PCM interface, and the first PCM interface is connected to the flash memory unit and retrieves the first audio data.
Optionally, the bluetooth headset according to any of the above, wherein the bluetooth chip includes a second PCM interface, and an I is connected between the first PCM interface and the second PCM interface2An S audio bus forming an uplink and a downlink for data transmission; wherein the codec chip receives a data stream of the first audio data via the downlink.
Optionally, the bluetooth headset according to any of the above, further comprising: the coding and decoding chip is connected with the microphone unit and the loudspeaker unit through an I/O interface; the coding and decoding chip further comprises: an encoder unit and a memory unit; the encoder unit is used for performing code conversion on the target sound signal collected by the microphone unit and storing the generated second audio data into the memory unit or transmitting the second audio data to the Bluetooth chip through the uplink.
Optionally, the bluetooth headset according to any of the above embodiments, wherein the codec chip is further configured to perform decoding conversion on the second audio data to obtain a second analog audio signal corresponding to the second audio data; the speaker unit is further operable to play second audio in response to the second analog audio signal.
Optionally, the bluetooth headset according to any of the above, further comprising: and the power amplifier unit is used for gaining the power of the first analog audio signal and the power of the second analog audio signal so as to drive the loudspeaker unit to correspondingly play the first audio and the second audio.
Optionally, the bluetooth headset according to any of the above, further comprising: an environmental noise reduction chip; the microphone unit comprises at least two microphones; the environmental noise reduction chip is used for positioning a target sound source according to the correlation between at least two sound signals collected by the at least two microphones, enhancing a first sound signal from the direction of the target sound source and inhibiting a second sound signal from the direction different from the direction of the target sound source so as to obtain the target sound signal.
Optionally, the bluetooth headset according to any of the above, further comprising: an active noise reduction chip; the active noise reduction chip is connected with the microphone unit and the loudspeaker unit and is used for filtering noise signals collected by the microphone unit to obtain noise reduction signals with the same amplitude and opposite phases with the noise signals; the loudspeaker unit is also used for responding the noise reduction signal to play noise reduction sound waves so as to reduce noise of the ear canal area of the user of the Bluetooth headset.
Optionally, the bluetooth headset according to any of the above, wherein the flash memory unit is integrated with an extended flash memory of the bluetooth chip.
Advantageous effects
According to the method and the device, the audio data are stored in the flash memory unit, and the coding and decoding chip is arranged to call the audio data in the flash memory unit for decoding and converting to obtain the corresponding analog audio signal, so that the loudspeaker is driven to realize audio playing according to the analog audio signal. This application can avoid bluetooth headset in bluetooth wireless transmission process through this kind of mode of directly retrieving audio data from bluetooth headset, owing to the tone quality loss that causes to the compression of lossless audio file code rate or data packet loss. From this, the bluetooth headset of this application can avoid the tone quality reduction that processes such as bluetooth wireless transmission lead to under the prerequisite that possesses other bluetooth headset functions, makes the earphone user can experience the music enjoyment of high-quality.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application and not limit the application. In the drawings:
FIG. 1 is a schematic block circuit diagram of a Bluetooth headset of the present application;
fig. 2 is a circuit block diagram of the bluetooth headset implementing audio playing of the present application.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" in this application is intended to include both the individual and the simultaneous presence of both.
The meaning of "inside and outside" in this application means that, with respect to the bluetooth headset housing, the direction from the bluetooth headset housing to its internal circuit structure is inside, and vice versa; and not as a specific limitation on the mechanism of the device of the present application.
The term "connected" in the present application may mean either a direct connection between the components or an indirect connection between the components through other components.
Fig. 1 is a schematic block circuit diagram of a bluetooth headset according to the present application. The circuit of the bluetooth headset provided by the application can be applied to a TWS headset, and the circuit structure of the circuit comprises:
a charging chip;
the storage battery, such as a lithium battery, is used for supplying power for the Bluetooth chip, the coding and decoding chip and other peripheral equipment. In some embodiments, the circuit may further include: a Low Dropout Regulator (LDO) configured to ensure that the bluetooth chip or the codec chip can still normally operate when a difference between an input voltage, i.e., a battery voltage, of the bluetooth chip or the codec chip and an output voltage is less than a preset threshold;
the crystal oscillator is connected with the Bluetooth chip and used for providing a clock signal for the earphone and ensuring that the Bluetooth signal can normally realize wireless communication connection;
inside the bluetooth chip can be set up to include: a Radio Frequency (RF) module and a data communication interface, wherein the data communication interface can be selected as a PCM (Pulse Code Modulation) interface. The radio frequency module is used for being connected with the Bluetooth antenna and transmitting and receiving electromagnetic waves through the Bluetooth antenna to achieve wireless communication between the earphone and the matched external electronic equipment. In some embodiments, the bluetooth chip may further include: and a Microprocessor (MCU) integrating the functions of Digital Signal Processing (DSP), communication processing, control processing and the like. In addition, the Bluetooth chip can expand a flash memory unit outside the chip to support a digital audio processing process with complex technology or high optimization, such as panoramic sound rendering and the like;
the coding and decoding chip comprises: data communication interfaces such as a PCM interface, an I/O interface, a Decoder (Decoder), an Encoder (Encoder), a Power Amplifier (PA), and the like corresponding to the above bluetooth chip. Wherein, the Bluetooth chip is communicated with the coding and decoding chipThe over-programmable PCM interface implements the interaction of digital audio, I2The S (Inter-IC Sound) audio bus, as one implementation thereof, may support mono PCM data and binaural/multi-channel stereo PCM data. It should be noted that, in order to minimize the number of pins of the chip, I2The S-audio bus may use only three serial buses: a Data line (Serial Data), a field Selection line (Word Selection), and a Clock signal line (Serial Clock) that provide a Time Division Multiplexing (TDM) function;
the I/O interface of the codec chip may be used for data exchange between the codec chip and external devices, such as a microphone unit, a speaker unit, a volume controller, and the like. The microphone unit can be used as a call microphone unit of the Bluetooth headset, acquires user voice to obtain an analog electric signal, performs analog-to-digital conversion (A/D) processing such as sampling, quantization and coding on the analog electric signal through the on-chip encoder, converts the analog electric signal into a digital voice signal, and uses an I (input/output) PCM (pulse code modulation) interface of the coding and decoding chip and an I (input/output) interface of an uplink to convert the analog electric signal into the digital voice signal2And the S audio bus is transmitted to a second PCM interface of the Bluetooth chip and finally transmitted to the remote end in a Bluetooth wireless mode, so that a corresponding Bluetooth communication function is realized.
For solving the problem of tone quality loss that leads to among the prior art because bluetooth transmission audio data, this application still stores first audio data through the flash memory unit in bluetooth headset to the codec chip that sets up bluetooth headset can directly call the first audio data in the flash memory unit in the bluetooth headset, thereby the corresponding audio playback that carries on.
To implement this function, as shown in fig. 2, the bluetooth headset of the present application includes: the Bluetooth chip is used for carrying out wireless data interaction with the pairing equipment of the Bluetooth headset; a flash memory unit for storing first audio data; the coding and decoding chip is connected with the flash memory unit and is used for carrying out decoding conversion on the first audio data to obtain a first analog audio signal corresponding to the first audio data; and the loudspeaker unit is connected with the coding and decoding chip and is used for responding to the first analog audio signal to play the first audio.
From this, the bluetooth headset that this application provided can be through its inside flash memory unit direct storage audio data, need not other equipment and sends the audio data that supplies the broadcast to the earphone in real time through the bluetooth, therefore, the tone quality loss that processes such as this application can avoid wireless transmission lead to makes the user can experience the music enjoyment of high-quality, does not influence the normal use of other bluetooth functions simultaneously.
The Flash memory unit can be realized by an independent Flash memory (Flash) chip. In some implementations, the Flash memory unit may also be integrated with the extended Flash memory of the bluetooth chip into the same Flash chip.
Therefore, the Bluetooth headset can be set to directly call the digitalized first audio data which is burnt in the flash memory unit for storing the audio in advance through the first PCM interface by the coding and decoding chip of the Bluetooth headset, and then the I of the downlink connected with the first PCM interface is utilized2And the S audio bus transmits the first audio data acquired from the flash memory unit in a streaming form, decodes the data stream through an on-chip decoder and performs D/A (digital/analog) processing such as decoding and the like, so that digital signals corresponding to the first audio data are converted into analog electric signals, and then the analog signals are amplified through a power amplifier in a coding and decoding chip, and then the loudspeaker unit arranged on the Bluetooth headset is correspondingly driven to realize music playing.
In order to facilitate the management of the first audio data by the flash memory unit in the Bluetooth headset, a wired data interface can be further arranged in the Bluetooth headset. The flash memory unit is connected with the external electronic equipment through a wired data interface and stores first audio data transmitted by the external electronic equipment through a data line.
That is, except for the first audio data that is pre-burned into the flash memory unit in factory settings, the earphone of the present application can simultaneously support operations such as adding, deleting, sound rendering, etc. to the first audio data in the flash memory unit through the wired data interface. For example, the present application may set a wired connection interface such as USB or Lightning in the bluetooth headset housing, and write new first audio data and sound patch data into the flash memory unit by the external device for calling or playing.
Generally, the voice call function of a bluetooth headset is usually realized by an input device such as a microphone unit and an output device such as a speaker provided in the headset structure. Therefore, the functions of recording, replaying and the like can be realized by multiplexing the input and output devices of the Bluetooth headset. The input devices required for the recording process can usually be realized by a microphone unit or various types of sensor devices; the output device required for playback can typically be implemented using the speaker unit of the bluetooth headset itself.
The microphone unit collects user voice signals, the user voice signals are input into the coding and decoding chip through the I/O interface, and after the coding unit in the coding and decoding chip carries out the digital processing steps of sampling, quantization, coding and the like, second audio data are generated. The second audio data can be directly stored in the memory unit in the coding and decoding chip to form a second audio file in a digital format for Bluetooth transmission or playback through a loudspeaker unit of a Bluetooth headset. For example, the second audio data may also pass through the second and first PCM interfaces between the bluetooth chip and the codec chip, and pass through the I of the uplink connected between the two interfaces2And the S audio bus transmits the second audio data to the Bluetooth chip in a streaming form, performs data interaction on the equipment matched with the Bluetooth headset in a Bluetooth mode through the Bluetooth chip, and transmits the second audio data to other electronic equipment matched with the Bluetooth headset.
The above playback process can be specifically realized by the following steps: the second audio data stored in the memory unit can be called after the storage is finished, the analog signal is formed after D/A conversion processing such as decoding and the like is carried out by a decoder unit in the coding and decoding chip, and the analog signal can drive the loudspeaker unit to realize the playback after the analog signal is correspondingly subjected to gain amplification by a power amplifier in the coding and decoding chip.
It should be noted that, if the bluetooth headset is provided with the in-shell microphone unit and the headset shell external microphone unit at the same time, the application can record the other party and the headset user respectively through the in-shell microphone unit and the headset shell external microphone unit during the headset call, and store the second audio data corresponding to the recording for playback or bluetooth transmission after the processing by the codec chip.
Because of the noise that is prevalent in the environment in which bluetooth headsets are used, in some embodiments, the headset of the present application may further include: an active noise reduction Chip (ANC Chip) and an ambient noise reduction Chip (ENC Chip).
The active noise reduction is realized by acquiring noise signals through the microphone unit, analyzing a sound field to obtain noise reduction signals corresponding to the noise signals in the current environment, and correspondingly outputting the noise reduction signals to the loudspeaker unit to offset the sound field, so that the noise entering the auditory canal is reduced. Generally, the active noise reduction chip can be directly connected with the microphone unit and the loudspeaker unit, and noise signals collected by the microphone unit are filtered to obtain noise reduction signals with the same amplitude and opposite phases as the noise signals; the speaker unit is specifically configured to play the noise reduction sound wave in response to the noise reduction signal to reduce noise in an ear canal region of a user of the bluetooth headset.
The essence of ambient noise reduction is to reduce the noise of the speech signal of the target object. For a bluetooth headset employing an array of microphone units, such as at least two microphones, the ambient noise reduction chip is configured to locate a target sound source according to a correlation between at least two sound signals collected by the at least two microphones, enhance a first sound signal from a target sound source direction, and suppress a second sound signal from a non-target sound source direction to obtain the target sound signal.
The above are merely embodiments of the present application, and the description is specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the protection scope of the present application.
Claims (10)
1. A bluetooth headset, comprising:
the Bluetooth chip is used for carrying out wireless data interaction with the pairing equipment of the Bluetooth headset;
a flash memory unit for storing first audio data;
the coding and decoding chip is connected with the flash memory unit and is used for carrying out decoding conversion on the first audio data to obtain a first analog audio signal corresponding to the first audio data;
and the loudspeaker unit is connected with the coding and decoding chip and used for responding to the first analog audio signal to play a first audio.
2. The bluetooth headset of claim 1, further comprising: a wired data interface; the flash memory unit is connected with external electronic equipment through the wired data interface and stores first audio data transmitted by the external electronic equipment through a data line.
3. The bluetooth headset of claim 1, wherein the codec chip comprises a first PCM interface, which is connected to the flash memory unit through the first PCM interface and retrieves the first audio data.
4. The bluetooth headset of claim 3, wherein the bluetooth chip comprises a second PCM interface, and I is connected between the first PCM interface and the second PCM interface2An S audio bus forming an uplink and a downlink for data transmission; wherein the codec chip receives a data stream of the first audio data via the downlink.
5. The bluetooth headset of claim 4, further comprising: the coding and decoding chip is connected with the microphone unit and the loudspeaker unit through an I/O interface;
the coding and decoding chip further comprises: an encoder unit and a memory unit; the encoder unit is used for performing code conversion on the target sound signal collected by the microphone unit and storing the generated second audio data into the memory unit or transmitting the second audio data to the Bluetooth chip through the uplink.
6. The bluetooth headset of claim 5, wherein the codec chip is further configured to perform decoding conversion on the second audio data to obtain a second analog audio signal corresponding to the second audio data; the speaker unit is further operable to play second audio in response to the second analog audio signal.
7. The bluetooth headset of claim 6, further comprising: and the power amplifier unit is used for gaining the power of the first analog audio signal and the power of the second analog audio signal so as to drive the loudspeaker unit to correspondingly play the first audio and the second audio.
8. The bluetooth headset of claim 5, further comprising: an environmental noise reduction chip; the microphone unit comprises at least two microphones; the environmental noise reduction chip is used for positioning a target sound source according to the correlation between at least two sound signals collected by the at least two microphones, enhancing a first sound signal from the direction of the target sound source and inhibiting a second sound signal from the direction different from the direction of the target sound source so as to obtain the target sound signal.
9. The bluetooth headset of claim 5, further comprising: an active noise reduction chip; the active noise reduction chip is connected with the microphone unit and the loudspeaker unit and is used for filtering noise signals collected by the microphone unit to obtain noise reduction signals with the same amplitude and opposite phases with the noise signals; the loudspeaker unit is also used for responding the noise reduction signal to play noise reduction sound waves so as to reduce noise of the ear canal area of the user of the Bluetooth headset.
10. The bluetooth headset of any of claims 1-9, wherein the flash memory unit is integrated with an extended flash memory of the bluetooth chip.
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| CN202011146791.0A CN112153519A (en) | 2020-10-23 | 2020-10-23 | Bluetooth earphone |
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| CN202011146791.0A CN112153519A (en) | 2020-10-23 | 2020-10-23 | Bluetooth earphone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115278473A (en) * | 2022-07-27 | 2022-11-01 | 重庆电子工程职业学院 | Bluetooth stereo system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115278473A (en) * | 2022-07-27 | 2022-11-01 | 重庆电子工程职业学院 | Bluetooth stereo system |
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