CN113949965A - Sound production device for eliminating POP sound and control method - Google Patents
Sound production device for eliminating POP sound and control method Download PDFInfo
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- CN113949965A CN113949965A CN202111221965.XA CN202111221965A CN113949965A CN 113949965 A CN113949965 A CN 113949965A CN 202111221965 A CN202111221965 A CN 202111221965A CN 113949965 A CN113949965 A CN 113949965A
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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
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
- G10K11/17853—Methods, e.g. algorithms; Devices of the filter
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
Abstract
The application provides a sound production device for eliminating POP sound and a control method, comprising an audio unit, a power amplification unit and a voltage division unit; the audio unit is used for outputting a first audio signal and a second audio signal which have the same amplitude and are opposite in phase; the first output end of the audio unit is connected with the first input end of the power amplification unit, and the second output end of the audio unit is connected with the second input end of the power amplification unit; the first output end and the second output end of the audio unit are respectively connected with the enabling end of the power amplification unit through the voltage division unit. The first output end and the second output end of the audio unit are respectively connected with the enabling end of the power amplification unit, and the power amplification unit is controlled to enter different working states by outputting different signals, so that the sound generating device avoids generating plosive sound.
Description
Technical Field
The application relates to the technical field of POP sound elimination, in particular to a sound production device for eliminating POP sound and a control method.
Background
POP sound (chinese is usually translated into plosive sound) of an audio system is mainly caused by spike pulse at a dc blocking capacitor connected with an electroacoustic device at an output end due to sudden change of dc offset voltage of each audio electrical signal. The pulse signals contain abundant frequency components, wherein the noise with the frequency between 20Hz and 20KHz is converted into sound signals by the electroacoustic device and then can be heard by human ears. The larger the voltage change is, the shorter the time is, the more obvious the output POP sound is.
At present, the general loudspeaker design scheme with power amplifier amplification controls the power amplifier chip to be opened and closed through an IO interface output control signal (SPK _ CTRL), and eliminates POP sound through strict control of power-up and power-down time sequence.
However, the above design has the disadvantages that: one IO interface is occupied for a long time; software processing is complex, each playing has strict time sequence requirements, POP sound can be generated when the power-on sequence is not correct, and long processing time is needed because the time sequence processing needs response time. As can be seen from fig. 4, after the audio signal is turned on, a time delay is usually at least greater than 10ms, and then the enable pin of the power amplifier chip is turned on, and then the content to be played is played, the audio signal must be turned off after the enable pin of the power amplifier chip is turned off, otherwise POP sound is generated.
Disclosure of Invention
In view of the problems, the present application is proposed to provide a sound emission device and a control method for eliminating a POP sound that overcome or at least partially solve the problems, including:
a sounding device for eliminating POP sound is applied to eliminating the POP sound generated when the sounding device comprising a power amplifier unit is started or closed; the sound generating device includes: the audio unit, the power amplifier unit and the voltage division unit; the audio unit is used for outputting a first audio signal and a second audio signal which have the same amplitude and are opposite in phase;
the first output end of the audio unit is connected with the first input end of the power amplification unit, and the second output end of the audio unit is connected with the second input end of the power amplification unit; the first output end and the second output end of the audio unit are respectively connected with the enabling end of the power amplification unit through the voltage division unit;
when the first audio signal is output by the first output end of the audio unit and the second audio signal is output by the second output end of the audio unit, the enabling end of the power amplification unit receives the first audio signal and the second audio signal and starts the first input end and the second input end of the power amplification unit according to the first audio signal and the second audio signal.
Optionally, the voltage dividing unit includes a diode D1 and a diode D2;
the anode of the diode D1 is connected with the second output end of the audio unit, and the cathode of the diode D1 is connected with the enabling end of the power amplifier unit; the anode of the diode D2 is connected to the first output terminal of the audio unit, and the cathode of the diode D2 is connected between the cathode of the diode D1 and the enable terminal of the power amplifier unit.
Optionally, the voltage dividing unit includes a resistor R1 and a resistor R2;
a first end of the resistor R1 is connected with a second output end of the audio unit, and a second end of the resistor R1 is connected with an enabling end of the power amplification unit; the first end of the resistor R2 is connected with the first output end of the audio unit, and the second end of the resistor R2 is connected between the second end of the resistor R1 and the enabling end of the power amplification unit.
Optionally, the system further comprises a first filtering unit and a second filtering unit;
the first filtering unit is connected between the first output end of the audio unit and the first input end of the power amplification unit;
the second filtering unit is connected between the second output end of the audio unit and the second input end of the power amplification unit.
Optionally, the first filtering unit comprises a capacitor C1 and a resistor R3;
the first end of the capacitor C1 is connected with the first output end of the audio unit, the second end of the capacitor C1 is connected with the first end of the resistor R3, and the second end of the resistor R3 is connected with the first input end of the power amplifier unit.
Optionally, the second filtering unit comprises a capacitor C2 and a resistor R4;
the first end of the capacitor C2 is connected with the second output end of the audio unit, the second end of the capacitor C2 is connected with the first end of the resistor R4, and the second end of the resistor R4 is connected with the second input end of the power amplifier unit.
Optionally, a resistor R5 is also included;
the first end of the resistor R5 is connected between the cathode of the diode D1 and the cathode of the diode D2, and the second end of the resistor R5 is connected with the enable end of the power amplification unit.
Optionally, a resistor R6 is also included;
the first end of the resistor R6 is connected between the second end of the resistor R5 and the enabling end of the power amplification unit; the second end of the resistor R6 is connected to ground.
A control method for eliminating POP sound by the sound generating device comprises the following steps:
when receiving a starting instruction, the audio unit outputs reference voltage to the power amplification unit and enters a signal transmission mode after a first time period;
the power amplification unit receives the reference voltage through the voltage division unit, enters an initial state according to the reference voltage and maintains the first duration;
when the audio unit outputs the first audio signal and the second audio signal in the signal transmission mode, the power amplifier unit receives the first audio signal and the second audio signal output by the audio unit through the voltage divider unit and enters a working state according to the first audio signal and the second audio signal;
when a closing instruction is received, the audio unit outputs the reference voltage to the power amplification unit and stops outputting the reference voltage after a second time length;
and the power amplification unit receives the reference voltage through the voltage division unit, enters an initial state according to the reference voltage and maintains the second duration.
Optionally, when the audio unit outputs the first audio signal and the second audio signal in the signal transmission mode, the power amplifier unit receives the first audio signal and the second audio signal sent by the audio unit through the voltage divider unit, and after the step of entering the working state according to the first audio signal and the second audio signal, the method further includes:
and when the transmission of the first audio signal and the second audio signal is finished, the audio unit outputs the reference voltage to the power amplification unit, and stops outputting the reference voltage after a second time period.
The application has the following advantages:
in the embodiment of the application, the audio frequency amplifier comprises an audio frequency unit, a power amplification unit and a voltage division unit; the audio unit is used for outputting a first audio signal and a second audio signal which have the same amplitude and are opposite in phase; the first output end of the audio unit is connected with the first input end of the power amplification unit, and the second output end of the audio unit is connected with the second input end of the power amplification unit; the first output end and the second output end of the audio unit are respectively connected with the enabling end of the power amplification unit through the voltage division unit; when the first audio signal is output by the first output end of the audio unit and the second audio signal is output by the second output end of the audio unit, the enabling end of the power amplification unit receives the first audio signal and the second audio signal and starts the first input end and the second input end of the power amplification unit according to the first audio signal and the second audio signal. The first output end and the second output end of the audio unit are respectively connected with the enabling end of the power amplification unit, and the power amplification unit is controlled to enter different working states through outputting different signals, so that the sound generating device avoids generating plosive sound.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the present application will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a sound generating device for eliminating a POP sound according to an embodiment of the present application;
fig. 2 is a playing timing diagram of a sound generating device for eliminating a POP sound according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a sound generating device for eliminating a POP sound according to an embodiment of the present application;
fig. 4 is a timing diagram of a conventional loudspeaker with power amplifier.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description. It is to be understood that the embodiments described are only a few 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 embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 to fig. 3, a sound generating apparatus for eliminating a POP sound according to an embodiment of the present application is shown, where the sound generating apparatus is used to eliminate a POP sound generated when a sound generating apparatus including a power amplifier unit is turned on or turned off; the sound generating device includes: the audio unit, the power amplifier unit and the voltage division unit; the audio unit is used for outputting a first audio signal and a second audio signal which have the same amplitude and are opposite in phase;
the first output end of the audio unit is connected with the first input end of the power amplification unit, and the second output end of the audio unit is connected with the second input end of the power amplification unit; the first output end and the second output end of the audio unit are respectively connected with the enabling end of the power amplification unit through the voltage division unit;
when the first audio signal is output by the first output end of the audio unit and the second audio signal is output by the second output end of the audio unit, the enabling end of the power amplification unit receives the first audio signal and the second audio signal and starts the first input end and the second input end of the power amplification unit according to the first audio signal and the second audio signal.
In the embodiment of the application, the audio frequency amplifier comprises an audio frequency unit, a power amplification unit and a voltage division unit; the audio unit is used for outputting a first audio signal and a second audio signal which have the same amplitude and are opposite in phase; the first output end of the audio unit is connected with the first input end of the power amplification unit, and the second output end of the audio unit is connected with the second input end of the power amplification unit; the first output end and the second output end of the audio unit are respectively connected with the enabling end of the power amplification unit through the voltage division unit; when the first audio signal is output by the first output end of the audio unit and the second audio signal is output by the second output end of the audio unit, the enabling end of the power amplification unit receives the first audio signal and the second audio signal and starts the first input end and the second input end of the power amplification unit according to the first audio signal and the second audio signal. The first output end and the second output end of the audio unit are respectively connected with the enabling end of the power amplification unit, and the power amplification unit is controlled to enter different working states through outputting different signals, so that the sound generating device avoids generating plosive sound.
Next, a sound emission device that eliminates the POP sound in the present exemplary embodiment will be further described.
In an embodiment of the application, directly control through audio signal the enable terminal of power amplifier unit to the realization is avoided sound generating device produces the plosive.
Referring to fig. 1, the enable terminal of the power amplifier unit is respectively connected to the first output terminal and the second output terminal of the audio unit through the voltage divider unit.
It should be noted that, the enable end of the power amplification unit is or gate control logic.
When the audio is turned on, the first output end (SPK _ N) and the second output end (SPK _ P) of the audio unit are first pulled up to a half-high level, and at this time, the enable end (SD) of the power amplifier unit is also followed, and the working process of the power amplifier unit can be divided into three steps:
1) open the audio frequency in the twinkling of an eye, audio unit's first output (SPK _ N) and second output (SPK _ P) output reference voltage, audio unit's first output (SPK _ N) and second output (SPK _ P) and power amplifier unit's enable end (SD) is followed reference voltage draws high in step, this moment because audio unit's first output (SPK _ N) and second output (SPK _ P) level are equal completely, for power amplifier unit, differential input is 0 (low level), and the output is also 0, this moment sound generating mechanism does not produce sound, does not have the plosive yet.
2) After the audio is turned on, a certain waiting time, namely the output of the reference voltage is maintained, after the first time length, the first output end (SPK _ N) of the audio unit outputs the first audio signal, and the second output end (SPK _ P) of the audio unit outputs the second audio signal; because the enable terminal (SD) of the power amplification unit is OR gate control logic, SPK _ P, SPK _ N signals are completely opposite, after receiving the first audio signal and the second audio signal, the enable terminal (SD) of the power amplification unit becomes 1 (high level), and controls the first input terminal and the second input terminal of the power amplification unit to respectively receive the first audio signal and the second audio signal, so that the sound production device plays the first audio signal and the second audio signal.
3) After playing the audio frequency of wanting to play, owing to have the software processing time, maintain promptly the output of reference voltage, first output (SPK _ N) and second output (SPK _ P) of audio unit and enable end (SD) of power amplifier unit are followed the reference voltage is drawn to half high in step, and this moment because first output (SPK _ N) and second output (SPK _ P) level of audio unit are equal completely, for power amplifier unit, the differential input is 0 (low level), and the output is also 0, this moment sound generating mechanism does not produce sound, also does not have the plosive. And then when the audio is closed, namely after the second time length, the first output end (SPK _ N) and the second output end (SPK _ P) of the audio unit and the enabling end (SD) of the power amplification unit synchronously drop to a low level, and a complete playing audio is finished everywhere.
It should be noted that, because a delay of about 10mS exists inside a general power amplifier chip SD (an enable end (SD) of the power amplifier unit), the first duration and the second duration are at least greater than 10mS, that is, the internal delays of the power amplifier chip SD are the first duration and the second duration, so that the POP sound is not generated when the power is turned on at the same time.
In an embodiment of the present application, the voltage dividing unit includes a diode D1 and a diode D2;
the anode of the diode D1 is connected with the second output end of the audio unit, and the cathode of the diode D1 is connected with the enabling end of the power amplifier unit; the anode of the diode D2 is connected to the first output terminal of the audio unit, and the cathode of the diode D2 is connected between the cathode of the diode D1 and the enable terminal of the power amplifier unit.
In another embodiment of the present application, the voltage dividing unit includes a resistor R1 and a resistor R2;
a first end of the resistor R1 is connected with a second output end of the audio unit, and a second end of the resistor R1 is connected with an enabling end of the power amplification unit; the first end of the resistor R2 is connected with the first output end of the audio unit, and the second end of the resistor R2 is connected between the second end of the resistor R1 and the enabling end of the power amplification unit.
In an embodiment of the present application, the apparatus further includes a first filtering unit and a second filtering unit;
the first filtering unit is connected between the first output end of the audio unit and the first input end of the power amplification unit;
the second filtering unit is connected between the second output end of the audio unit and the second input end of the power amplification unit.
In an embodiment of the present application, the first filtering unit includes a capacitor C1 and a resistor R3;
the first end of the capacitor C1 is connected with the first output end of the audio unit, the second end of the capacitor C1 is connected with the first end of the resistor R3, and the second end of the resistor R3 is connected with the first input end of the power amplifier unit.
In an embodiment of the present application, the second filtering unit includes a capacitor C2 and a resistor R4;
the first end of the capacitor C2 is connected with the second output end of the audio unit, the second end of the capacitor C2 is connected with the first end of the resistor R4, and the second end of the resistor R4 is connected with the second input end of the power amplifier unit.
In an embodiment of the present application, the device further includes a resistor R5;
the first end of the resistor R5 is connected between the cathode of the diode D1 and the cathode of the diode D2, and the second end of the resistor R5 is connected with the enable end of the power amplification unit.
In an embodiment of the present application, the device further includes a resistor R6;
the first end of the resistor R6 is connected between the second end of the resistor R5 and the enabling end of the power amplification unit; the second end of the resistor R6 is connected to ground.
An embodiment of the application provides a control method for eliminating a POP sound by a sound generating device, and the control method includes:
when receiving a starting instruction, the audio unit outputs reference voltage to the power amplification unit and enters a signal transmission mode after a first time period;
the power amplification unit receives the reference voltage through the voltage division unit, enters an initial state according to the reference voltage and maintains the first duration;
when the audio unit outputs the first audio signal and the second audio signal in the signal transmission mode, the power amplifier unit receives the first audio signal and the second audio signal output by the audio unit through the voltage divider unit and enters a working state according to the first audio signal and the second audio signal;
when a closing instruction is received, the audio unit outputs the reference voltage to the power amplification unit and stops outputting the reference voltage after a second time length;
and the power amplification unit receives the reference voltage through the voltage division unit, enters an initial state according to the reference voltage and maintains the second duration.
In an embodiment of the application, when the audio unit outputs the first audio signal and the second audio signal in the signal transmission mode, the power amplifier unit receives the first audio signal and the second audio signal sent by the audio unit through the voltage divider unit, and after the step of entering the working state according to the first audio signal and the second audio signal, the power amplifier unit further includes:
and when the transmission of the first audio signal and the second audio signal is finished, the audio unit outputs the reference voltage to the power amplification unit, and stops outputting the reference voltage after a second time period.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be 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 terminal 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 terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The sound production device and the control method for eliminating the POP sound provided by the application are introduced in detail, specific examples are applied in the text to explain the principle and the implementation mode of the application, and the description of the above embodiments is only used for helping to understand the method and the core idea of the application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. The sound production device for eliminating the POP sound is characterized in that the sound production device is used for eliminating the POP sound generated when the sound production device comprising a power amplifier unit is started or closed; the sound generating device includes: the audio unit, the power amplifier unit and the voltage division unit; the audio unit is used for outputting a first audio signal and a second audio signal which have the same amplitude and are opposite in phase;
the first output end of the audio unit is connected with the first input end of the power amplification unit, and the second output end of the audio unit is connected with the second input end of the power amplification unit; the first output end and the second output end of the audio unit are respectively connected with the enabling end of the power amplification unit through the voltage division unit;
when the first audio signal is output by the first output end of the audio unit and the second audio signal is output by the second output end of the audio unit, the enabling end of the power amplification unit receives the first audio signal and the second audio signal and starts the first input end and the second input end of the power amplification unit according to the first audio signal and the second audio signal.
2. The sound generating apparatus according to claim 1, wherein the voltage dividing unit comprises a diode D1 and a diode D2;
the anode of the diode D1 is connected with the second output end of the audio unit, and the cathode of the diode D1 is connected with the enabling end of the power amplifier unit; the anode of the diode D2 is connected to the first output terminal of the audio unit, and the cathode of the diode D2 is connected between the cathode of the diode D1 and the enable terminal of the power amplifier unit.
3. The sound generating apparatus according to claim 1, wherein the voltage dividing unit comprises a resistor R1 and a resistor R2;
a first end of the resistor R1 is connected with a second output end of the audio unit, and a second end of the resistor R1 is connected with an enabling end of the power amplification unit; the first end of the resistor R2 is connected with the first output end of the audio unit, and the second end of the resistor R2 is connected between the second end of the resistor R1 and the enabling end of the power amplification unit.
4. The apparatus according to claim 2, further comprising a first filter unit and a second filter unit;
the first filtering unit is connected between the first output end of the audio unit and the first input end of the power amplification unit;
the second filtering unit is connected between the second output end of the audio unit and the second input end of the power amplification unit.
5. The sound generating device of claim 4, wherein the first filter unit comprises a capacitor C1 and a resistor R3;
the first end of the capacitor C1 is connected with the first output end of the audio unit, the second end of the capacitor C1 is connected with the first end of the resistor R3, and the second end of the resistor R3 is connected with the first input end of the power amplifier unit.
6. The sound generating device of claim 4, wherein the second filter unit comprises a capacitor C2 and a resistor R4;
the first end of the capacitor C2 is connected with the second output end of the audio unit, the second end of the capacitor C2 is connected with the first end of the resistor R4, and the second end of the resistor R4 is connected with the second input end of the power amplifier unit.
7. The sound generating apparatus of claim 4, further comprising a resistor R5;
the first end of the resistor R5 is connected between the cathode of the diode D1 and the cathode of the diode D2, and the second end of the resistor R5 is connected with the enable end of the power amplification unit.
8. The sound generating apparatus of claim 4, further comprising a resistor R6;
the first end of the resistor R6 is connected between the second end of the resistor R5 and the enabling end of the power amplification unit; the second end of the resistor R6 is connected to ground.
9. A control method for eliminating POP sound by a sound emission device according to any one of claims 1 to 8, the control method comprising:
when receiving a starting instruction, the audio unit outputs reference voltage to the power amplification unit and enters a signal transmission mode after a first time period;
the power amplification unit receives the reference voltage through the voltage division unit, enters an initial state according to the reference voltage and maintains the first duration;
when the audio unit outputs the first audio signal and the second audio signal in the signal transmission mode, the power amplifier unit receives the first audio signal and the second audio signal output by the audio unit through the voltage divider unit and enters a working state according to the first audio signal and the second audio signal;
when a closing instruction is received, the audio unit outputs the reference voltage to the power amplification unit and stops outputting the reference voltage after a second time length;
and the power amplification unit receives the reference voltage through the voltage division unit, enters an initial state according to the reference voltage and maintains the second duration.
10. The method according to claim 9, wherein when the audio unit outputs the first audio signal and the second audio signal in the signal transmission mode, the power amplifier unit receives the first audio signal and the second audio signal sent by the audio unit through the voltage divider unit, and enters an operating state according to the first audio signal and the second audio signal, and further comprising:
and when the transmission of the first audio signal and the second audio signal is finished, the audio unit outputs the reference voltage to the power amplification unit, and stops outputting the reference voltage after a second time period.
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| US20150350779A1 (en) * | 2014-02-14 | 2015-12-03 | Dennis McNutt | Audio system and method for reduction of microphone distortion |
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