CN111263268A - Loudspeaker POP sound cancelling circuit and electronic product during outage - Google Patents
Loudspeaker POP sound cancelling circuit and electronic product during outage Download PDFInfo
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- CN111263268A CN111263268A CN202010041328.3A CN202010041328A CN111263268A CN 111263268 A CN111263268 A CN 111263268A CN 202010041328 A CN202010041328 A CN 202010041328A CN 111263268 A CN111263268 A CN 111263268A
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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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Abstract
The invention discloses a loudspeaker POP sound eliminating circuit and an electronic product during power failure, wherein the loudspeaker POP sound eliminating circuit is connected with a power amplifier module and a main control module during power failure and is characterized by comprising a power-on control circuit, a power-off control circuit and a silencing circuit; the power-on control circuit controls the silencing circuit to carry out silencing when the electronic product works normally, and the power-off control circuit controls the silencing circuit to carry out silencing when the electronic product is powered off. The power-off control circuit controls the silencing circuit to enable the power amplification module to keep in a silencing mode when the electronic product is powered off, and POP sound generated by a loudspeaker when the electronic product is powered off is eliminated.
Description
Technical Field
The invention relates to the field of POP sound elimination, in particular to a loudspeaker POP sound elimination circuit and an electronic product during power failure.
Background
The android main board of the existing alternating current power supply electronic product, such as a conference panel, generally controls a power amplifier module through 2 GPIO ports, one is MUTE for controlling power amplifier silence, and the other is RESET for resetting a power amplifier chip. When the product normally works or is in standby, the main chip can control the power amplifier module by controlling the 2 GPIO ports, so that the loudspeaker plays sound or is in a mute state. However, when the alternating current input by the electronic product is powered off, the android mainboard is not powered on, so that the 2 GPIO ports MUTE and RESET cannot control the power amplifier, and a POP sound is generated by the loudspeaker at the moment of power off, so that noise is generated by the whole machine.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide the loudspeaker POP sound eliminating circuit and the electronic product during power failure.
In order to achieve the purpose, the invention adopts the following technical scheme:
a kind of loudspeaker POP sound elimination circuit while cutting off the power, connect with power amplifier module and top management module, including power on control circuit, power off control circuit and sound-deadening circuit; the power-on control circuit controls the silencing circuit to carry out silencing when the electronic product works normally, and the power-off control circuit controls the silencing circuit to carry out silencing when the electronic product is powered off.
The power-off control circuit comprises a double power supply unit, and the double power supply unit supplies power to the power-off control circuit.
The power-off control circuit further comprises a standby power supply unit, wherein the standby power supply unit provides voltage when the electronic product is powered off, and the double power supply unit supplies power to the standby power supply unit when the electronic product works normally.
The power-off control circuit further comprises a switch unit which is conducted when the power is off so as to control the silencing circuit to silence.
The double power supply unit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a first diode; one end of the first resistor is connected with 12V voltage, one end of the second resistor is connected with 5V voltage, the other end of the first resistor and the other end of the second resistor are connected with an input end of the first diode, one end of the third resistor and the switch unit, an output end of the first diode is connected with one end of the fourth resistor, and the other end of the fourth resistor is connected with the standby power supply unit and the silencing circuit.
The standby power supply unit comprises a first electrolytic capacitor, a first filter capacitor, a second filter capacitor and a fifth resistor; the first electrolytic capacitor is connected with the other end of the fourth resistor, one end of the first filter capacitor, one end of the second filter capacitor, one end of the fifth resistor, the silencing circuit and the switch unit, and the other end of the first electrolytic capacitor, the other end of the first filter capacitor, the other end of the second filter capacitor and the other end of the fifth resistor are all grounded.
The switch unit comprises a PNP triode, a sixth resistor, a seventh resistor and a second diode; the utility model discloses a PNP triode, including first resistance, second resistance, PNP triode, first filter capacitor, second filter capacitor, noise cancelling circuit, sixth resistance one end with the other end of first resistance, the other end of second resistance, the one end of third resistance and the input of first diode are connected, the other end of sixth resistance with the base of PNP triode is connected, the projecting pole of PNP triode with the one end of fifth resistance, the other end of fourth resistance, first filter capacitor's one end second filter capacitor's one end and noise cancelling circuit connect, the collecting electrode of PNP triode and the one end of seventh resistance are connected, the other end of seventh resistance is connected with the input of second diode, the output and the last electric control circuit and the noise cancelling circuit of second diode are connected.
The power-on control circuit comprises an eighth resistor, a ninth resistor and a third diode; one end of the eighth resistor is connected to a 3.3V pull-up power supply, the other end of the eighth resistor is connected to one end of a ninth resistor and the MUTE _ TMP end of the master control module, the other end of the ninth resistor is connected to the input end of a third diode, and the output end of the third diode is connected to the output end of the second diode and the noise reduction circuit.
The noise reduction circuit comprises a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourth diode, a fifth diode, a third filter capacitor and an NPN triode; one end of the tenth resistor is connected with the other end of the first electrolytic capacitor, the other end of the fourth resistor, one end of the first filter capacitor, one end of the second filter capacitor, one end of the fifth resistor and the emitting electrode of the PNP triode, the other end of the tenth resistor is connected with the input end of the fourth diode and one end of the eleventh resistor, the other end of the eleventh resistor is grounded, the input end of the fifth diode is connected with a 3.3V pull-up power supply, the output end of the fourth diode and the output end of the fifth diode are both connected with one end of the twelfth resistor, the other end of the twelfth resistor is connected with one end of the thirteenth resistor, one end of the third filter capacitor, the collecting electrode of the NPN triode and the silencing pin of the power amplification module, and the other end of the third filter capacitor and the other end of the thirteenth resistor are both grounded.
The utility model provides an electronic product, includes the electronic product body, be provided with the mainboard in the electronic product body, be provided with on the mainboard as above loudspeaker POP sound cancelling circuit during the outage.
Compared with the prior art, the power-off loudspeaker POP sound eliminating circuit and the electronic product are characterized by comprising a power-on control circuit, a power-off control circuit and a silencing circuit, wherein the power-off loudspeaker POP sound eliminating circuit is connected with the power amplifier module and the main control module; the power-on control circuit controls the silencing circuit to carry out silencing when the electronic product works normally, and the power-off control circuit controls the silencing circuit to carry out silencing when the electronic product is powered off. The power-off control circuit controls the silencing circuit to enable the power amplification module to keep in a silencing mode when the electronic product is powered off, and POP sound generated by a loudspeaker when the electronic product is powered off is eliminated.
Drawings
FIG. 1 is a functional block diagram of an electronic product according to the present invention;
fig. 2 is a functional block diagram of a structure of a speaker POP sound eliminating circuit in power-off according to the present invention;
fig. 3 is a circuit diagram of the POP sound cancellation circuit for a speaker during power-off according to the present invention.
Detailed Description
In view of the problems in the prior art, the invention provides a loudspeaker POP sound eliminating circuit during power failure and an electronic product.
The embodiments of the present invention are intended to explain technical concepts of the present invention, technical problems to be solved, technical features constituting technical solutions, and technical effects to be brought about in more detail. The embodiments are explained below, but the scope of the present invention is not limited thereto. Further, the technical features of the embodiments described below may be combined with each other as long as they do not conflict with each other.
The POP tone is generated by a dc level jump on the channel of the loudspeaker 20 when the codec starts to operate. In the prior art, in the normal working process of an electronic product, a main control chip can control the power amplifier module 300 to eliminate POP sound; however, when the power is turned on or off, the main control chip is also powered off because the main board 10 is powered off, so that the main control chip cannot control the power amplifier module 300 to perform the POP sound elimination operation; therefore, the level of the horn 20 jumps sharply during the on/off operation, so that POP sound exists during the on/off operation, and cannot be eliminated.
In summary, referring to fig. 1 and fig. 2, the present invention provides a power-off speaker 20POP sound cancellation circuit, which includes a power-on control circuit 120, a power-off control circuit 110, and a mute circuit 130; the power-on control circuit 120 is connected to the main control module 200 and the silencing circuit 130, the power-off control circuit 110 is connected to the power-on control circuit 120, the main control module 200 and the silencing circuit 130, and the silencing circuit 130 is further connected to the power amplifier module 300. The power-on control circuit controls the silencing circuit 130 to silence when the electronic product works normally, and the power-off control circuit 110 controls the silencing circuit 130 to silence when the electronic product is powered off. Specifically, when the electronic product works normally, the power-on control circuit 120, the power-off control circuit 110, and the noise reduction circuit 130 are all powered by the main control module 200. The main control module 200 is disposed on the main board 10, optionally, the electronic product may be a conference tablet, the main board 10 may be an android main board, the main control module 200 includes a main control chip, and in this embodiment, the main control chip is an android main chip.
Specifically, referring to fig. 3, the power-off control circuit 110 includes a dual power supply unit, a switch unit and a standby power supply unit, the dual power supply unit supplies power to the switch unit and the silencing circuit 130 when the electronic product normally works, the switch unit is turned on to control the silencing circuit 130 to silence when the electronic product is powered off, the standby power supply unit supplies voltage to the switch unit when the electronic product is powered off, and the dual power supply unit supplies power to the standby power supply unit when the electronic product normally works.
Specifically, with reference to fig. 3, the dual power supply unit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first diode D1; one end and the 12V voltage of first resistance R1 are connected, the one end and the 5V voltage of second resistance R2 are connected, the other end of first resistance R1 and the other end of second resistance R2 all are connected with first diode D1's input, third resistance R3's one end and switch unit, first diode D1's output is connected with the one end of fourth resistance R4, the other end and the stand-by power supply unit of fourth resistance R4 and amortization circuit 130 are connected.
In this embodiment, a 12V voltage (i.e., 12V _ NOR voltage in fig. 3) may be connected to the first resistor R1 or a 5V voltage (i.e., 5V _ NOR voltage in fig. 3) may be connected to the second resistor R2 to charge the standby power unit and supply power to the mute circuit 130.
Specifically, with reference to fig. 3, the standby power unit includes a first electrolytic capacitor CS1, a first filter capacitor C1, a second filter capacitor C2, and a fifth resistor R5; the first electrolytic capacitor CS1 is connected to the other end of the fourth resistor R4, one end of the first filter capacitor C1, one end of the second filter capacitor C2, one end of the fifth resistor R5, the noise reduction circuit 130, and the switch unit, and the other end of the first electrolytic capacitor CS1, the other end of the first filter capacitor C1, the other end of the second filter capacitor C2, and the other end of the fifth resistor R5 are all grounded.
In this embodiment, when the electronic product is powered on and normally operates, the first electrolytic capacitor CS1 is charged by the dc voltage of 12V accessed by the first resistor R1 or the dc voltage of 5V accessed by the second resistor R2, and the first electrolytic capacitor CS1 may be charged by the 12V _ NOR voltage or the 5V _ NOR voltage according to the power-down characteristics of the power board. For example, the power panel outputs 12V _ NOR voltage and 5V _ NOR voltage for power supply, when the ac input of the power panel is disconnected, the 12V _ NOR voltage is powered down earlier than the 5V _ NOR voltage, and then the 12V dc voltage is connected through the first resistor to supply power to the first electrolytic capacitor CS 1. The reason is that: the circuit that loses power first will not have voltage, then PNP triode Q1's base just becomes low level at first, and stand-by power supply still has the electricity this moment, therefore PNP triode Q1 just can switch on fast when losing power, triode Q1 just exports a high level at first for the amortization control circuit of rear end, amortization control circuit obtains a low level through triode Q2 looks reversal, this low level is exported for the amortization foot of power amplifier module, consequently makes the timely amortization mode of keeping of power amplifier. When the electronic product is powered off, no voltage is input to the first resistor R1 and the second resistor R2, and the first electrolytic capacitor CS1 supplies power to the switching unit and the noise reduction circuit 130.
Specifically, with reference to fig. 3, the switch unit includes a PNP transistor Q1, a sixth resistor R6, a seventh resistor R7, and a second diode D2; one end of the sixth resistor R6 is connected to the other end of the first resistor R1, the other end of the second resistor R2, one end of the third resistor R3 and the input end of the first diode D1, the other end of the sixth resistor R6 is connected to the base of the PNP triode Q1, the emitter of the PNP triode Q1 is connected to one end of the fifth resistor R5, the other end of the fourth resistor R4, one end of the first filter capacitor C1, one end of the second filter capacitor C2 and the noise reduction circuit 130, the collector of the PNP triode Q1 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to the input end of the second diode D2, and the output end of the second diode D2 is connected to the power-on control circuit 120 and the noise reduction circuit 130.
In this embodiment, when the electronic product is powered off, the first electrolytic capacitor CS1 discharges to supply power to the PNP transistor Q1 and the noise reduction circuit 130. Because the whole electronic product is powered off, the base electrode of the PNP triode Q1 has no voltage input and is at a low level; the emitter of the PNP transistor Q1 is powered by the first electrolytic capacitor CS1, and is at a high level, and the PNP transistor Q1 is turned on. After the PNP triode Q1 is turned on, the PNP triode Q1 sequentially passes through the seventh resistor R7 and the second diode D2 to send a control signal to the mute circuit 130, so that the mute circuit 130 maintains a mute mode when the electronic product is powered off.
Specifically, referring to fig. 3, the power-up control circuit 120 includes an eighth resistor R8, a ninth resistor R9, and a third diode D3; one end of the eighth resistor R8 is connected to a 3.3V pull-up power supply, the other end of the eighth resistor R8 is connected to one end of the ninth resistor R9 and the MUTE _ TMP end of the main control module 200, the other end of the ninth resistor R9 is connected to the input end of the third diode D3, and the output end of the third diode D3 is connected to the output end of the second diode D2 and the MUTE circuit 130.
In specific implementation, in this embodiment, when the electronic product normally operates, the power board provides a 3.3V pull-up power (i.e., 3.3V _ NOR in fig. 3) to the eighth resistor R8 and the MUTE circuit 130, and at the same time, the MUTE pin of the android main chip sends a MUTE _ AMP signal, and the MUTE pin sequentially passes through the ninth resistor R9 and the third diode D3 to send a control signal to the MUTE module, so as to control the MUTE circuit 130 to maintain the MUTE mode when the electronic product normally operates.
Specifically, as shown in fig. 3, the noise cancellation circuit 130 includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourth diode D4, a fifth diode D5, a third filter capacitor C3, and an NPN transistor Q2; one end of the tenth resistor R10 is connected to the other ends of the first electrolytic capacitor CS1 and the fourth resistor R4, one end of the first filter capacitor C1, one end of the second filter capacitor C2, one end of the fifth resistor R5, and the emitter of the PNP triode Q2, the other end of the tenth resistor R10 is connected to the input terminal of the fourth diode D4 and one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is grounded, the input end of the fifth diode D5 is connected with a 3.3V pull-up power supply, an output end of the fourth diode D4 and an output end of the fifth diode D5 are both connected with one end of a twelfth resistor R12, the other end of the twelfth resistor R12 is connected to one end of the thirteenth resistor R13, one end of the third filter capacitor C3, the collector of the NPN triode Q2 and the noise cancellation pin of the power amplifier module 300, the other end of the third filter capacitor C3 and the other end of the thirteenth resistor R13 are both grounded.
In this embodiment, when the electronic product is operating normally, the power board provides a 3.3V pull-up power to the eighth resistor R8 and the fifth diode D5, so as to provide operating voltages for the power-on control circuit 120 and the mute circuit 130. Meanwhile, the android main chip sends a control signal to the NPN triode Q2 through the ninth resistor R9 and the third diode D3, so that the NPN triode Q2 is turned on, and sends a low-level signal (i.e., a PD # _ AMP signal in fig. 3) to the mute pin of the power amplifier module 300 for muting.
When the complete machine of the electronic product is powered off, the android main chip is powered off without voltage output, and the power-off control circuit 110 controls the silencing circuit 130 to keep the silencing module. The base electrode of the PNP triode Q1 is at low level, the first electrolytic capacitor CS1 supplies power to the emitter electrode of the PNP triode Q1, and the PNP triode Q1 is conducted. Meanwhile, as the first electrolytic capacitor CS1 is used as a backup power supply to supply power to the PNP transistor Q1 and the noise cancellation circuit 130, the power supply branch composed of the tenth resistor R10 and the twelfth resistor R12 provides the voltage required by the noise cancellation circuit 130. At this time, the base of the NPN transistor Q2 is at a high level, so that the NPN transistor Q2 is turned on, and at this time, the NPN transistor Q2 is an inverter, and outputs a low level signal (i.e., the PD # _ AMP signal in fig. 3) to the noise cancellation pin of the power amplification module 300. The mute pin of the power amplifier module 300 receives the low level to mute the POP tone.
Referring to fig. 1, based on the above mentioned circuit for eliminating POP sound of speaker during power failure, the present invention further provides an electronic product, which includes an electronic product body, wherein the electronic product body is provided with a main board, and the main board is provided with the above mentioned circuit 100 for eliminating POP sound of speaker during power failure. Since the POP sound cancellation circuit for the speaker at power-off has been described in detail above, it is not described herein again.
In summary, the cyclically powered off-time speaker POP sound eliminating circuit and the electronic product provided by the invention are characterized by comprising an on-power control circuit, an off-power control circuit and a silencing circuit, wherein the on-power control circuit is connected with the power amplifier module and the main control module; the power-on control circuit controls the silencing circuit to carry out silencing when the electronic product works normally, and the power-off control circuit controls the silencing circuit to carry out silencing when the electronic product is powered off. The power-off control circuit controls the silencing circuit to enable the power amplification module to keep in a silencing mode when the electronic product is powered off, and POP sound generated by a loudspeaker when the electronic product is powered off is eliminated.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A kind of loudspeaker POP sound elimination circuit while cutting off the power, connect with power amplifier module and top management module, characterized by, including power on control circuit, power off control circuit and amortization circuit; the power-on control circuit controls the silencing circuit to carry out silencing when the electronic product works normally, and the power-off control circuit controls the silencing circuit to carry out silencing when the electronic product is powered off.
2. The POP sound eliminating circuit of claim 1, wherein the power-off control circuit comprises a double power supply unit, and the double power supply unit supplies power to the power-off control circuit.
3. The POP sound eliminating circuit of claim 2, wherein the power-off control circuit further comprises a standby power supply unit, the standby power supply unit supplies voltage when the electronic product is powered off, and the dual power supply unit supplies power to the standby power supply unit when the electronic product works normally.
4. The POP sound eliminating circuit of claim 3, wherein the power-off control circuit further comprises a switch unit, and the switch unit is turned on when the power-off control circuit is powered off to control the silencing circuit to silence.
5. The POP sound elimination circuit of the loudspeaker during the power failure as claimed in claim 4, wherein the dual power supply unit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a first diode; one end of the first resistor is connected with 12V voltage, one end of the second resistor is connected with 5V voltage, the other end of the first resistor and the other end of the second resistor are connected with an input end of the first diode, one end of the third resistor and the switch unit, an output end of the first diode is connected with one end of the fourth resistor, and the other end of the fourth resistor is connected with the standby power supply unit and the silencing circuit.
6. The POP sound eliminating circuit of the power-off loudspeaker as defined in claim 5, wherein the standby power supply unit comprises a first electrolytic capacitor, a first filter capacitor, a second filter capacitor and a fifth resistor; the first electrolytic capacitor is connected with the other end of the fourth resistor, one end of the first filter capacitor, one end of the second filter capacitor, one end of the fifth resistor, the silencing circuit and the switch unit, and the other end of the first electrolytic capacitor, the other end of the first filter capacitor, the other end of the second filter capacitor and the other end of the fifth resistor are all grounded.
7. The POP sound eliminating circuit for the loudspeaker during power failure of claim 6, wherein the switch unit comprises a PNP triode, a sixth resistor, a seventh resistor and a second diode; the utility model discloses a PNP triode, including first resistance, second resistance, PNP triode, first filter capacitor, second filter capacitor, noise cancelling circuit, sixth resistance one end with the other end of first resistance, the other end of second resistance, the one end of third resistance and the input of first diode are connected, the other end of sixth resistance with the base of PNP triode is connected, the projecting pole of PNP triode with the one end of fifth resistance, the other end of fourth resistance, first filter capacitor's one end second filter capacitor's one end and noise cancelling circuit connect, the collecting electrode of PNP triode and the one end of seventh resistance are connected, the other end of seventh resistance is connected with the input of second diode, the output and the last electric control circuit and the noise cancelling circuit of second diode are connected.
8. The POP sound eliminating circuit for the loudspeaker during power failure of claim 7, wherein the power-on control circuit comprises an eighth resistor, a ninth resistor and a third diode; one end of the eighth resistor is connected to a 3.3V pull-up power supply, the other end of the eighth resistor is connected to one end of a ninth resistor and the MUTE _ TMP end of the master control module, the other end of the ninth resistor is connected to the input end of a third diode, and the output end of the third diode is connected to the output end of the second diode and the noise reduction circuit.
9. The POP sound eliminating circuit of claim 8, wherein the sound attenuating circuit comprises a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourth diode, a fifth diode, a third filter capacitor and an NPN triode; one end of the tenth resistor is connected with the other end of the first electrolytic capacitor, the other end of the fourth resistor, one end of the first filter capacitor, one end of the second filter capacitor, one end of the fifth resistor and the emitting electrode of the PNP triode, the other end of the tenth resistor is connected with the input end of the fourth diode and one end of the eleventh resistor, the other end of the eleventh resistor is grounded, the input end of the fifth diode is connected with a 3.3V pull-up power supply, the output end of the fourth diode and the output end of the fifth diode are both connected with one end of the twelfth resistor, the other end of the twelfth resistor is connected with one end of the thirteenth resistor, one end of the third filter capacitor, the collecting electrode of the NPN triode and the silencing pin of the power amplification module, and the other end of the third filter capacitor and the other end of the thirteenth resistor are both grounded.
10. An electronic product, characterized in that, includes the electronic product body, be provided with the mainboard in the electronic product body, be provided with on the mainboard according to claim 1 ~ 9 arbitrary one during outage loudspeaker POP sound cancelling circuit.
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| CN202010041328.3A CN111263268B (en) | 2020-01-15 | 2020-01-15 | Loudspeaker POP sound cancelling circuit and electronic product during outage |
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| CN202010041328.3A CN111263268B (en) | 2020-01-15 | 2020-01-15 | Loudspeaker POP sound cancelling circuit and electronic product during outage |
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| CN111263268B CN111263268B (en) | 2022-02-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112954546A (en) * | 2021-02-01 | 2021-06-11 | 广州朗国电子科技有限公司 | Control circuit, module and terminal equipment for removing plosive by electrifying and powering off |
| CN113115180A (en) * | 2021-04-28 | 2021-07-13 | 广州朗国电子科技有限公司 | Plosive removing device of audio output end and audio equipment |
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| CN112954546A (en) * | 2021-02-01 | 2021-06-11 | 广州朗国电子科技有限公司 | Control circuit, module and terminal equipment for removing plosive by electrifying and powering off |
| CN113115180A (en) * | 2021-04-28 | 2021-07-13 | 广州朗国电子科技有限公司 | Plosive removing device of audio output end and audio equipment |
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