CN214014505U - Circuit for eliminating POP sound of audio equipment - Google Patents
Circuit for eliminating POP sound of audio equipment Download PDFInfo
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- CN214014505U CN214014505U CN202022771600.1U CN202022771600U CN214014505U CN 214014505 U CN214014505 U CN 214014505U CN 202022771600 U CN202022771600 U CN 202022771600U CN 214014505 U CN214014505 U CN 214014505U
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- 230000003139 buffering effect Effects 0.000 claims abstract description 12
- 230000003321 amplification Effects 0.000 claims abstract description 11
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 11
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000001052 transient effect Effects 0.000 description 13
- 238000001914 filtration Methods 0.000 description 5
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 230000005236 sound signal Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 210000003454 tympanic membrane Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 210000000697 sensory organ Anatomy 0.000 description 1
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Abstract
The utility model relates to an eliminate circuit of audio equipment POP sound belongs to audio equipment auxiliary technical field, and it is including the input interface that is used for connecting audio input, the output interface who is used for audio amplifier's amplification unit and is used for connecting loudspeaker, be connected with the silence unit that is used for getting rid of the noise between amplification unit and the output interface, the silence unit is including the electricity connect in the silence branch road of amplification unit output, be used for connecting audio equipment control module's control branch road and connect the buffering branch road between control branch road and silence branch road, the buffering branch road is used for adjusting the duration that the noise was eliminated. The application provides a circuit of audio equipment POP sound has the effect of eliminating the noise that audio equipment produced at the switching on and shutting down in-process.
Description
Technical Field
The application relates to the technical field of audio equipment assistance, in particular to a circuit for eliminating POP sound of audio equipment.
Background
Many audio devices always hear a burst of noise (POP) when they are plugged in, powered off, turned on, or turned off, due to the momentary jump in the bias voltage of some ICs when they are powered off. The impact of POP sound not only can produce the impact to the sound membrane of speaker, influences output tone quality, and the impact of POP sound still can produce the impact to people's eardrum simultaneously, influences the comfort level of sense organ, can damage the eardrum even when serious.
SUMMERY OF THE UTILITY MODEL
In order to eliminate the noise generated by the audio equipment in the process of switching on and switching off, the application provides a circuit for eliminating POP sound of the audio equipment.
The circuit for eliminating POP sound of the audio equipment adopts the following technical scheme:
the utility model provides a circuit of elimination audio equipment POP sound, is including the input interface that is used for connecting audio input, the output interface that is used for audio amplification's amplification unit and is used for connecting loudspeaker, be connected with the silence unit that is used for getting rid of the noise between amplification unit and the output interface, the silence unit is including the silence branch road of electricity connection in the amplification unit output, be used for connecting audio equipment control module's control branch road and connect the buffering branch road between control branch road and silence branch road, the buffering branch road is used for adjusting the duration that the noise was eliminated.
By adopting the technical scheme, the mute unit is arranged between the amplifying unit and the loudspeaker output interface, so that the jump level of the audio equipment after audio processing can be transmitted to the ground through the mute unit, and before the loudspeaker plays sound, transient voltage generated by the audio equipment in the processes of power on, power off and power off is filtered, so that noise is removed.
Further, the mute branch comprises a first switch piece connected between the output end of the amplifying unit and the ground in series, and a control electrode of the first switch piece is electrically connected to the output end of the buffer branch;
the control branch comprises a second switching piece connected between the buffering branch and the ground in series, and a control electrode of the second switching piece is electrically connected to the output end of the control module of the audio equipment;
the buffering branch circuit comprises a third switch piece and a buffering piece, wherein the control electrode of the third switch piece is connected with the second switch piece, one end of the buffering piece is connected with the control electrode of the third switch piece, and the other end of the buffering piece is grounded.
By adopting the technical scheme, the transient voltage on the audio line is led to the ground when the first switch part is switched on by arranging the mute branch circuit, so that the transient voltage is prevented from flowing into the loudspeaker to generate POP sound; the control branch is arranged to enable the mute branch to eliminate the noise of the audio equipment according to the operation of the audio equipment; the noise elimination can be continued for a certain time by providing the buffer member.
Furthermore, the circuit also comprises a power supply unit for supplying power, wherein the power supply unit comprises a main power supply and an auxiliary power supply, and the auxiliary power supply is connected with the second switch piece, the third switch piece and the buffer piece.
By adopting the technical scheme, the power supply unit is arranged to provide energy for the operation of the circuit.
Furthermore, the second switch element is connected in series between the secondary power supply and the ground, a first voltage-dividing resistor and a second voltage-dividing resistor are connected in series between the second switch element and the secondary power supply, a control electrode of the third switch element is connected between the first voltage-dividing resistor and the second voltage-dividing resistor, and one end, far away from the ground, of the buffer element is connected between the first voltage-dividing resistor and the second voltage-dividing resistor.
By adopting the technical scheme, the first voltage-dividing resistor and the second voltage-dividing resistor are arranged between the second switching element and the secondary power supply, and when the second switching element is switched on, a voltage signal received by the control electrode of the third switching element jumps under the voltage-dividing action of the first voltage-dividing resistor and the second voltage-dividing resistor.
Further, the resistance value of the first divider resistor is larger than that of the second divider resistor.
By adopting the technical scheme, after the second switch is switched on, the third switch controls the adopted voltage value to be the voltage value of the second divider resistor, and the resistance value of the first divider resistor is larger than that of the second divider resistor, so that the voltage jump of the control electrode of the third switch is more obvious when the second switch is switched on.
Furthermore, the output end of the third switch piece is electrically connected with the control electrode of the first switch piece, and a protective resistor is arranged between the output end of the third switch piece and the control electrode of the first switch piece.
By adopting the technical scheme, the protective resistor is arranged between the first switch piece and the third switch piece, so that the voltage impact on the control electrode of the first switch piece after the third switch piece is conducted can be effectively reduced.
Further, the first switch and the second switch are NPN-type triodes, and the third switch is a PNP-type triode.
By adopting the technical scheme, the processing cost of the circuit can be effectively reduced by adopting the triode as the switching element, meanwhile, the power consumption of the control gate pole of the triode is small, the on-off time is short, the service life is long, the environmental adaptability is good, and the triode can be widely used in audio equipment.
In summary, the present application includes at least one of the following beneficial technical effects:
1. a mute unit is arranged between an amplifying unit and a loudspeaker to filter transient voltage generated by audio equipment in the processes of power-on, power-off and power-off, so that noise is removed;
2. the circuit structure through setting up the silence unit is in order to realize filtering the noise promptly at the electricity in-process of inserting, can carry out the adjustment of noise removal time simultaneously according to the size of bolster.
Drawings
FIG. 1 is a block diagram of the overall architecture of an embodiment of the present application;
fig. 2 is a circuit diagram of a part of an embodiment of the present application, and mainly shows a circuit structure of a mute unit.
Description of reference numerals: 1. an amplifying unit; 2. a mute unit; 21. a mute branch; 22. a control branch; 23. buffering the branch circuit; 3. a power supply unit; 4. and a filtering unit.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses a circuit for eliminating POP sound of audio equipment. Referring to fig. 1 and 2, the circuit includes an input interface line OutA for connecting an audio input, an amplifying unit 1 for amplifying the audio, and an output interface AMP _ OUT for connecting a speaker, where the input interface line OutA connects the audio input and inputs the audio signal into the amplifying unit 1 for amplification, and the amplified audio signal is transmitted to the speaker through the output interface AMP _ OUT for playing. In order to prevent low-frequency direct-current voltage from entering the rear stage, a filtering unit 4 is arranged between the audio input and the amplifying unit 1, and the filtering unit 4 is an RC (resistor-capacitor) filtering circuit in the application. In order to remove the noise (POP sound) generated by the audio equipment in power-on, power-off, power-on and power-off processes, a mute unit 2 for removing the noise is electrically connected between the amplifying unit 1 and the output interface AMP _ OUT, and the mute unit 2 is mainly applied after the audio processing IC and the amplifying unit 1 (operational amplification) and before a loudspeaker (power amplifier) to filter transient voltage before an audio signal enters the power amplifier, so that the noise (POP sound) is removed.
The mute unit 2 comprises a mute branch 21 electrically connected to the output end of the amplifying unit 1, a control branch 22 for connecting with the audio equipment control module, and a buffer branch 23 connected between the control branch 22 and the mute branch 21, wherein the buffer branch 23 is used for adjusting the duration of noise elimination; the circuit further comprises a power supply unit 3 used for supplying power, the power supply unit 3 comprises a main power supply VDD and an auxiliary power supply VCC, wherein the main power supply VDD is started to supply power to the audio equipment when the audio equipment is started, the auxiliary power supply VCC is automatically started when the audio equipment is plugged, and supplies power to a control module of the audio equipment, namely an MCU (micro control unit) so as to ensure that the system can stably work when the audio equipment is started, and the voltage of the auxiliary power supply VCC is preferably 3.3V in the application.
The mute branch 21 includes a first switching element Q1 connected in series between the output terminal of the amplifying unit 1 and ground, and a control electrode of the first switching element Q1 is electrically connected to the output terminal of the buffer branch 23; the control branch 22 includes a second switch Q2 serially connected between the buffer branch 23 and the ground, a control electrode of the second switch Q2 is electrically connected to an output end of a control module of the audio device, and an on/off state of the second switch Q2 is controlled by an MCU of the audio device, in this application, the first switch Q1 and the second switch Q2 both employ NPN-type triodes. The buffer branch 23 comprises a third switching element Q3 and a buffer element C1, wherein a control electrode of the buffer element C1 is electrically connected with a control electrode of the second switching element Q2, and the other end of the buffer element C1 is grounded. The first switching device Q1, the second switching device Q2 and the third switching device Q3 may be implemented by other thyristor, such as MOS transistor, besides the triode.
The collector of the second switching element Q2 is connected to the secondary power supply VCC, so as to ensure that the audio equipment can respond quickly when the power line is plugged in and out; the emitter of the second switch element Q2 is grounded, when the audio device is powered on, powered off or powered off, the output end of the control module of the audio device outputs high level, that is, when the MCU of the audio device detects that the audio device is powered on, powered off or powered off, the MCU outputs high level, so that the second switch element Q2 is turned on; while the emitter of the third switching element Q3 is connected to the secondary power source VCC. A first divider resistor RF1 and a second divider resistor RF1 are connected in series between the second switch Q2 and the secondary power source VCC, a control electrode of the third switch Q3 is connected between the first divider resistor RF1 and the second divider resistor RF1, a resistance value of the first divider resistor RF1 is greater than a resistance value of the second divider resistor RF1, when the second switch Q2 is turned on, the control electrode of the third switch Q3 receives a low-level signal because the first divider resistor RF1 and the second divider resistor RF1 divide voltage and a resistance value of the second divider resistor RF1 is less than a resistance value of the first divider resistor RF1, and at this time, the third switch Q3 is turned on.
The collector of the third switching device Q3 is electrically connected to the control electrode of the first switching element, the collector of the first switching device Q1 is connected between the single amplifier unit and the output interface AMP _ OUT, the emitter of the first switching device Q1 is grounded, when the third switching device Q3 is turned on, the control electrode of the first switching device Q1 receives a high level signal, at this time, the first switching element is turned on, and the output terminal of the amplifying unit 1 is grounded, so that the transient voltage is prevented from flowing into the horn, i.e., the power amplifier, to generate POP sound. In order to reduce the impact of the voltage on the first switching element when the third switching element is turned on, a protective resistor RA is connected in series between the control electrode of the first switching element Q1 and the collector electrode of the third switch.
One end of the buffer C1, which is far from the ground, is connected between the first divider resistor RF1 and the second divider resistor RF1, when the audio device is plugged, the secondary power source VCC is automatically activated to supply power to the mute unit 2, at this time, the secondary power source VCC starts to charge the buffer C1, the base of the third switch Q3 is at a low level, the third switch is turned on, the control electrode of the first switch Q1 is at a high level, and the third switch Q3 is turned on. After the third switch element Q3 is turned on, transient voltage on the audio line is led to the ground, the transient voltage is prevented from flowing into the power amplifier to generate POP sound, therefore, the duration of eliminating the POP sound in the power plug process can be adjusted by adjusting the capacity value of the buffer element C1, and the larger the capacity value of the buffer element C1 is, the longer the duration of eliminating the POP sound is. Meanwhile, the provision of the buffer C1 enables the buffer C1 to discharge power for a certain time to continuously supply power to the second switch Q2 and the third switch Q3 when the audio device is powered off.
The implementation principle of the circuit for eliminating POP sound of the audio equipment in the embodiment of the application is as follows: when the audio equipment is plugged, the auxiliary power source VCC is started to supply power to the audio equipment and charge the buffer C1, at this time, the control level of the third switch element Q3 is low, the emission level is high, and the third switch element Q3 is in a conducting state, so that the control level of the first switch element Q1 is high, and the first switch element Q1 is also in a conducting state; when the first switch element Q1 is turned on, the transient voltage on the audio line is led to the ground, and the transient voltage is prevented from flowing into the loudspeaker to generate POP sound.
When the audio device is powered on, the auxiliary power VCC supplies power to the mute unit 2, and the buffer C1 is in a fully charged state at this time, and meanwhile, when the control module of the audio device detects a device power-on signal, a high-level signal is input to the control branch 22, the second switch Q2 is turned on, under the partial pressure of the first voltage-dividing resistor RF1 and the second voltage-dividing resistor RF1, the base of the third switch Q3 is at a low level, and the third switch Q3 is in an on state, so that the first switch Q1 is at a high level, and after the first switch Q1 is turned on, transient voltage is prevented from flowing into the speaker to generate POP sound.
When the audio device is powered off, the auxiliary power VCC supplies power to the mute unit 2 and the buffer C1 is in a fully charged state, when the control module of the audio device detects an apparatus power-off signal, a high level signal is still input to the control branch 22, the second switch Q2 is turned on, the base of the third switch Q3 is at a low level under the partial pressure of the first voltage-dividing resistor RF1 and the second voltage-dividing resistor RF1, the third switch Q3 is in a conducting state, so that the first switch Q1 is at a high level, and after the first switch Q1 is turned on, transient voltage is prevented from flowing into the speaker to generate POP sound.
When the audio equipment is powered off, the auxiliary power supply VCC with light load exists, and due to the existence of the buffer piece C1, the voltage of the auxiliary power supply VCC and the main power supply VDD cannot drop immediately due to the existence of the filter capacitor on the unit circuit of the auxiliary power supply VCC and the main power supply VDD, so that the control module of the audio equipment can still continue to control within a certain time; when the control module of the audio device detects that the main power supply VDD is turned off, the control module of the audio device still inputs a high level signal to the control branch 22, and at this time, the second switching element Q2 is turned on, and under the partial voltage of the first voltage-dividing resistor RF1 and the second voltage-dividing resistor RF1, the base of the third switching element Q3 is at a low level, and at this time, the third switching element Q3 is in a conducting state, so that the first switching element Q1 is at a high level, and after the first switching element Q1 is turned on, the transient voltage is prevented from flowing into the speaker to generate POP sound.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. A circuit for eliminating POP sounds of audio equipment, comprising an input interface for connecting an audio input, an amplification unit (1) for audio amplification and an output interface for connecting a speaker, characterized in that: a mute unit (2) for removing noise is electrically connected between the amplifying unit (1) and the output interface, the mute unit (2) comprises a mute branch (21) electrically connected with the output end of the amplifying unit (1), a control branch (22) for connecting an audio equipment control module and a buffer branch (23) connected between the control branch (22) and the mute branch (21), and the buffer branch (23) is used for adjusting the duration time of noise removal.
2. The circuit for canceling POP sound of an audio device according to claim 1, wherein: the mute branch (21) comprises a first switch piece connected between the output end of the amplifying unit (1) and the ground in series, and a control electrode of the first switch piece is electrically connected with the output end of the buffer branch (23);
the control branch (22) comprises a second switching element connected in series between the buffer branch (23) and the ground, and a control electrode of the second switching element is electrically connected to the output end of the control module of the audio equipment;
buffering branch road (23) are including third switch spare and the buffering piece that the control pole is connected with the second switch spare, the one end of bolster is connected with the control pole of third switch spare, the other end ground connection setting of bolster.
3. The circuit for canceling POP sound of an audio device according to claim 2, wherein: the circuit further comprises a power supply unit (3) for supplying power, wherein the power supply unit (3) comprises a main power supply and an auxiliary power supply, and the auxiliary power supply is connected with the second switch piece, the third switch piece and the buffer piece.
4. A circuit for canceling POP sound of an audio device according to claim 3, wherein: the second switch element is connected between the secondary power supply and the ground in series, a first voltage-dividing resistor and a second voltage-dividing resistor are connected between the second switch element and the secondary power supply in series, a control electrode of the third switch element is connected between the first voltage-dividing resistor and the second voltage-dividing resistor, and one end, far away from the ground, of the buffer element is connected between the first voltage-dividing resistor and the second voltage-dividing resistor.
5. The circuit for canceling sound of audio device POP according to claim 4, wherein: the resistance value of the first divider resistor is larger than that of the second divider resistor.
6. The circuit for canceling sound of audio device POP according to claim 4, wherein: the output end of the third switching piece is electrically connected with the control electrode of the first switching piece, and a protective resistor is arranged between the output end of the third switching piece and the control electrode of the first switching piece.
7. A circuit for canceling POP sound of an audio device according to claim 3, wherein: the first switch piece and the second switch piece are NPN type triodes, and the third switch piece is a PNP type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022771600.1U CN214014505U (en) | 2020-11-25 | 2020-11-25 | Circuit for eliminating POP sound of audio equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022771600.1U CN214014505U (en) | 2020-11-25 | 2020-11-25 | Circuit for eliminating POP sound of audio equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214014505U true CN214014505U (en) | 2021-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022771600.1U Expired - Fee Related CN214014505U (en) | 2020-11-25 | 2020-11-25 | Circuit for eliminating POP sound of audio equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214014505U (en) |
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2020
- 2020-11-25 CN CN202022771600.1U patent/CN214014505U/en not_active Expired - Fee Related
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Granted publication date: 20210820 |