CN204929213U - Audio signal detects control circuit - Google Patents
Audio signal detects control circuit Download PDFInfo
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- CN204929213U CN204929213U CN201520596832.4U CN201520596832U CN204929213U CN 204929213 U CN204929213 U CN 204929213U CN 201520596832 U CN201520596832 U CN 201520596832U CN 204929213 U CN204929213 U CN 204929213U
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Abstract
The utility model provides an audio signal detects control circuit. This circuit includes power amplifier module and speaker, and power amplifier module includes audio frequency input interface and audio output interface, and the output and the speaker of audio output interface are connected, and this circuit still includes: the audio frequency coupling module that links to each other with audio frequency input interface, the audio signal detection module who links to each other with audio frequency coupling module, be used for the detection whether to have the audio signal input links to each other, is used for the audio signal 0 according to audio signal detection module's output state output control signal with audio signal detection module, power amplifier module still includes and links to each other with control module for according to control signal control power amplifier module's operating condition's switch element, the switch element is still continuous with the audio output interface with audio frequency input interface. The utility model provides a can make when detecting no audio signal input power amplifier module that power amplifier module is automatic to get into standby state, the power amplifier module's that has significantly reduced energy consumption to can prolong power amplifier module's life.
Description
Technical field
The utility model belongs to audio product technical field, particularly relates to a kind of audio signal detection control circuit.
Background technology
Along with the raising of people's living standard, audio-frequence player device also becomes requisite part in people's entertainment life gradually.But, existing audio-frequence player device does not generally have the function that audio signal detects, therefore, may exist when audio frequency apparatus inputs or be in the state of the output such as the voiceless sound that suspends audio plays at no audio signal, the situation that this audio frequency apparatus is still in running order, and now for consumers this audio frequency apparatus be in voiceless sound export abnormal operating state, so just make audio frequency apparatus wait for audio signal input period in wasted electric energy.
Utility model content
The object of the utility model embodiment is to provide a kind of audio signal detection control circuit, be intended to solve above-mentioned existing audio-frequence player device and not there is audio signal measuring ability, may exist when audio frequency apparatus is still in running order when no audio signal inputs or be in noiseless output states such as suspending audio plays, cause the problem of wasting electric energy.
The utility model embodiment realizes like this, a kind of audio signal detection control circuit, comprise power amplifier module and loud speaker, described power amplifier module comprises audio input interface and audio output interface, the output of described audio output interface is connected with described loud speaker, described audio signal detection control circuit also comprises: the audio coupling module be connected with described audio input interface, be connected with described audio coupling module, for detecting the audio signal detection module whether having audio signal to input, be connected with described audio signal detection module, for exporting the control module of control signal according to the output state of described audio signal detection module, described power amplifier module also comprises and being connected with described control module, and for controlling the switch element of the operating state of described power amplifier module according to described control signal, described switch element is also connected with described audio output interface with described audio input interface.
In the audio signal detection control circuit described in the utility model embodiment, described audio coupling module comprises the first coupling capacitance and the second coupling capacitance, the first end of described first coupling capacitance and the first end of described second coupling capacitance are connected to the first pin and second pin of described audio input interface respectively, and the second end of described first coupling capacitance and the second end of described second coupling capacitance connect the audio input end that the output forming described audio coupling module is connected to described audio signal detection module altogether.
In the audio signal detection control circuit described in the utility model embodiment, described audio signal detection module comprises and being connected with externally fed voltage, for generation of the bias voltage generation unit of bias voltage, be connected with the output of described bias voltage generation unit and the output of described audio coupling module, audio signal for exporting described audio coupling module carries out the audio signal amplifying unit amplifying process, be connected with described audio signal amplifying unit, signal for exporting described audio signal amplifying unit carries out the rectification unit of rectification, be connected with the output of described rectification unit and the output of described bias voltage generation unit, the comparing unit that the voltage exported for the voltage that exports described rectification unit and described bias voltage generation unit compares.
In the audio signal detection control circuit described in the utility model embodiment, described bias voltage generation unit comprises the first filter capacitor, the 4th resistance and the 5th resistance;
Feeder ear and the externally fed voltage of described audio signal amplifying unit is connected to after the first end of described first filter capacitor and the first end of described 4th resistance connect altogether, second end ground connection of described first filter capacitor, the second end of described 4th resistance and the first end of described 5th resistance connect the output forming described bias voltage generation unit altogether and are connected to described audio signal amplifying unit.
In the audio signal detection control circuit described in the utility model embodiment, described audio signal amplifying unit comprises the first resistance, the second resistance and the first operational amplifier;
The first end of described first resistance is the audio input end of described audio signal detection module, the inverting input of described first operational amplifier is connected to after second end of described first resistance and the first end of described second resistance connect altogether, second end of described second resistance is connected to the output of described first operational amplifier and the input of described rectification unit, the normal phase input end of described first operational amplifier is connected to the output of described bias voltage generation unit, the feeder ear of described first operational amplifier is the feeder ear of described audio signal amplifying unit, the earth terminal ground connection of described first operational amplifier.
In the audio signal detection control circuit described in the utility model embodiment, described rectification unit comprises rectifier diode and the 3rd resistance;
The anode of described rectifier diode is that the input of described rectification unit is connected to described audio signal amplifying unit, the negative electrode of described rectifier diode and the first end of described 3rd resistance connect the output forming described rectification unit altogether and are connected to described comparing unit, the second end ground connection of described 3rd resistance.
In the audio signal detection control circuit described in the utility model embodiment, described comparing unit comprises the second operational amplifier and the 6th resistance;
The normal phase input end of described second operational amplifier is connected to the output of described rectification unit, the inverting input of described second operational amplifier is connected to the output of described bias voltage generation unit, and the output of described second operational amplifier is connected to described control module by described 6th resistance.
In the audio signal detection control circuit described in the utility model embodiment, described control module comprises switching tube, the 4th electric capacity, the 5th electric capacity and the 7th resistance;
The control end of described switching tube is the input of described control module, be connected to the output of described comparing unit, externally fed voltage is connected to after the first end of the input of described switching tube, the first end of described 4th electric capacity and described 7th resistance connects altogether, second end of described 4th electric capacity and the second end of described 7th resistance connect rear ground connection altogether, the output of described switching tube and the first end of described 5th electric capacity connect the control end that the output forming described control module is connected to described switch element, the second end ground connection of described 5th electric capacity altogether.
In the audio signal detection control circuit described in the utility model embodiment, described switching tube adopts metal-oxide-semiconductor, the base stage of described metal-oxide-semiconductor is the control end of described switching tube, and the drain electrode of described metal-oxide-semiconductor is the input of described switching tube, and the source electrode of described metal-oxide-semiconductor is the output of described switching tube.
The audio signal detection control circuit that implementing the utility model embodiment provides has following beneficial effect:
The audio signal detection control circuit that the utility model embodiment provides is owing to comprising the audio coupling module be connected with described audio input interface, be connected with described audio coupling module, for detecting the audio signal detection module whether having audio signal to input, be connected with described audio signal detection module, for exporting the control module of control signal according to the output state of described audio signal detection module; Described power amplifier module also comprises and being connected with described control module, for controlling the switch element of the operating state of described power amplifier module according to described control signal, described switch element is also connected with described audio output interface with described audio input interface, thus can detect whether there is audio signal input work amplification module, and power amplifier module can be made automatically to enter holding state when no audio signal input work amplification module being detected, greatly reduce the energy consumption of power amplifier module, and the useful life of power amplifier module can be extended.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the audio signal detection control circuit that the utility model embodiment provides;
Fig. 2 is the physical circuit fundamental diagram of the audio signal detection control circuit that the utility model embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 is the structured flowchart of the audio signal detection control circuit that the utility model embodiment provides.Illustrate only the part relevant to the utility model embodiment for convenience of explanation.
Shown in Figure 1, a kind of audio signal detection control circuit that the utility model embodiment provides, comprise power amplifier module 1 and loud speaker 2, described power amplifier module 1 comprises audio input interface 11 and audio output interface 12, the output of described audio output interface 12 is connected with described loud speaker 2, described audio signal detection control circuit also comprises: the audio coupling module 3 be connected with described audio input interface 11, be connected with described audio coupling module 3, for detecting the audio signal detection module 4 whether having audio signal to input, be connected with described audio signal detection module 4, for exporting the control module 5 of control signal according to the output state of described audio signal detection module 4, described power amplifier module 1 also comprises and being connected with described control module 5, for controlling the switch element 13 of the operating state of described power amplifier module 1 according to described control signal, described switch element 13 is also connected with described audio output interface 12 with described audio input interface 11.
In the utility model embodiment, described audio signal detection module 4 comprises and being connected with externally fed voltage, for generation of the bias voltage generation unit 41 of bias voltage, be connected with the output of described bias voltage generation unit 41 and the output of described audio coupling module 3, audio signal for exporting described audio coupling module 3 carries out the audio signal amplifying unit 42 amplifying process, be connected with described audio signal amplifying unit 42, signal for exporting described audio signal amplifying unit 42 carries out the rectification unit 43 of rectification, be connected with the output of described rectification unit 43 and the output of described bias voltage generation unit 41, for the comparing unit 44 that the voltage exported voltage and the described bias voltage generation unit 41 of described rectification unit 43 output compares.
Fig. 2 shows the physical circuit fundamental diagram of the audio signal detection control circuit that the utility model embodiment provides.Illustrate only the part relevant to the utility model embodiment for convenience of explanation.
Shown in Figure 2, in the utility model embodiment, described audio coupling module 3 comprises the first coupling capacitance C1 and the second coupling capacitance C2, the first end of described first coupling capacitance C1 and the first end of described second coupling capacitance C2 are connected to the first pin and second pin of described audio input interface 11 respectively, and second end of described first coupling capacitance C1 and second end of described second coupling capacitance C2 connect the audio input end that the output forming described audio coupling module 3 is connected to described audio signal detection module 4 altogether.
Further, in the utility model embodiment, described bias voltage generation unit 41 comprises the first filter capacitor C3, the 4th resistance R4 and the 5th resistance R5; Feeder ear and the externally fed voltage of described audio signal amplifying unit 42 is connected to after the first end of described first filter capacitor C3 and the first end of described 4th resistance R4 connect altogether, the second end ground connection of described first filter capacitor C3, second end of described 4th resistance R4 and the first end of described 5th resistance R5 connect the output forming described bias voltage generation unit 41 altogether and are connected to described audio signal amplifying unit 42.
Further, in the utility model embodiment, described audio signal amplifying unit 42 comprises the first resistance R1, the second resistance R2 and the first operational amplifier U1, the first end of described first resistance R1 is the audio input end of described audio signal detection module 4, the inverting input of described first operational amplifier U1 is connected to after second end of described first resistance R1 and the first end of described second resistance R2 connect altogether, second end of described second resistance R2 is connected to the described output of the first operational amplifier U1 and the input of described rectification unit 43, the normal phase input end of described first operational amplifier U1 is connected to the output of described bias voltage generation unit 41, the feeder ear of described first operational amplifier U1 is the feeder ear of described audio signal amplifying unit 42, the earth terminal ground connection of described first operational amplifier U1.
Further, in the utility model embodiment, described rectification unit 43 comprises rectifier diode D1 and the 3rd resistance R3; The anode of described rectifier diode D1 is that the input of described rectification unit 43 is connected to described audio signal amplifying unit 42, the negative electrode of described rectifier diode D1 and the first end of described 3rd resistance R3 connect the output forming described rectification unit 43 altogether and are connected to described comparing unit 44, the second end ground connection of described 3rd resistance R3.
Further, in the utility model embodiment, described comparing unit 44 comprises the second operational amplifier U2 and the 6th resistance R6; The normal phase input end of described second operational amplifier U2 is connected to the output of described rectification unit 43, the inverting input of described second operational amplifier U2 is connected to the output of described bias voltage generation unit 41, and the output of described second operational amplifier U2 is connected to described control module 5 by described 6th resistance R6.
Further, in the utility model embodiment, described control module 5 comprises switching tube Q1, the 4th electric capacity C4, the 5th electric capacity C5 and the 7th resistance R7, the control end of described switching tube Q1 is the input of described control module 5, be connected to the output of described comparing unit 44, the input of described switching tube Q1, externally fed voltage is connected to after the first end of described 4th electric capacity C4 and the first end of described 7th resistance R7 connect altogether, second end of described 4th electric capacity C4 and second end of described 7th resistance R7 connect rear ground connection altogether, the output of described switching tube Q1 and the first end of described 5th electric capacity C5 connect the control end that the output forming described control module 5 is connected to described switch element 13 altogether, the second end ground connection of described 5th electric capacity C5.
Further, in the utility model embodiment, described switching tube Q1 adopts metal-oxide-semiconductor, and the base stage of described metal-oxide-semiconductor is the control end of described switching tube Q1, the drain electrode of described metal-oxide-semiconductor is the input of described switching tube Q1, and the source electrode of described metal-oxide-semiconductor is the output of described switching tube Q1.
The operation principle of the audio signal detection control circuit that the utility model embodiment provides is elaborated below in conjunction with Fig. 1 and Fig. 2:
In the utility model embodiment, first the audio signal of the audio input interface 11 of power amplifier module 1 is gathered by the first coupling capacitance C1 and the second coupling capacitance C2, and the inverting input of the first operational amplifier U1 after the audio signal collected is processed, is inputed to by the first resistance R1 and the second resistance R2, carry out amplification by the first operational amplifier U1 to it to process, the normal phase input end of this first operational amplifier U1 connects a bias voltage being in linear working state, wherein, first operation amplifier gain is determined by the first resistance R1 and the second resistance R2, voltage Vout1=(R2/R1) the * Vin of the first operational amplifier U1 output, then, by rectifier diode D1, output voltage U2 after rectification process is carried out to the voltage that the first operational amplifier U1 exports, to eliminate the negative voltage that the first operational amplifier U1 exports, and the voltage U 2 after rectification is inputed to the normal phase input end of the second operational amplifier U2, the inverting input of the second operational amplifier U2 is connected to the output of bias voltage generation unit 41, by the second operational amplifier U2, bias voltage and voltage U 2 are compared, and conducting and the cut-off of metal-oxide-semiconductor is controlled according to comparative result, thus by the conducting of metal-oxide-semiconductor and the closed and disconnected of cut-off control switch unit 13, reach the object controlling power amplifier module 1 operating state.Further, in the utility model embodiment, when audio input interface 11 place of power amplifier module 1 has audio signal to input, now carried out exporting high level after amplification processes to it by the first operational amplifier U1, now, output voltage U2 after first operational amplifier U1 rectification is greater than the bias voltage that bias voltage generation unit 41 generates, second operational amplifier U2 exports high level, metal-oxide-semiconductor conducting, therefore, control module 5 also exports high level, and switch element 13 is closed, and power amplifier module 1 is in running order; Otherwise, when the audio input interface 11 place no audio signal input of power amplifier module 1, first operational amplifier U1 output LOW voltage, now voltage U 2 is less than the bias voltage that bias voltage generation unit 41 generates, second operational amplifier U2 output low level, metal-oxide-semiconductor is in cut-off state, therefore, now control module 5 also output low level, switch element 13 is made to be in off-state, power amplifier module 1 enters holding state automatically, and the audio signal detection control circuit that so far the utility model embodiment provides completes audio signal detection control function.
Therefore, can find out, whether the audio signal detection that the utility model embodiment provides can not only detect audio signal input work amplification module 1, but also power amplifier module 1 can be made automatically to enter holding state when no audio signal input work amplification module 1 being detected, greatly reduce the energy consumption of power amplifier module 1, and the useful life of power amplifier module 1 can be extended.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (9)
1. an audio signal detection control circuit, comprise power amplifier module and loud speaker, described power amplifier module comprises audio input interface and audio output interface, the output of described audio output interface is connected with described loud speaker, it is characterized in that, described audio signal detection control circuit also comprises: the audio coupling module be connected with described audio input interface, be connected with described audio coupling module, for detecting the audio signal detection module whether having audio signal to input, be connected with described audio signal detection module, for exporting the control module of control signal according to the output state of described audio signal detection module, described power amplifier module also comprises and being connected with described control module, and for controlling the switch element of the operating state of described power amplifier module according to described control signal, described switch element is also connected with described audio output interface with described audio input interface.
2. audio signal detection control circuit as claimed in claim 1, it is characterized in that, described audio coupling module comprises the first coupling capacitance and the second coupling capacitance, the first end of described first coupling capacitance and the first end of described second coupling capacitance are connected to the first pin and second pin of described audio input interface respectively, and the second end of described first coupling capacitance and the second end of described second coupling capacitance connect the audio input end that the output forming described audio coupling module is connected to described audio signal detection module altogether.
3. audio signal detection control circuit as claimed in claim 2, it is characterized in that, described audio signal detection module comprises and being connected with externally fed voltage, for generation of the bias voltage generation unit of bias voltage, be connected with the output of described bias voltage generation unit and the output of described audio coupling module, audio signal for exporting described audio coupling module carries out the audio signal amplifying unit amplifying process, be connected with described audio signal amplifying unit, signal for exporting described audio signal amplifying unit carries out the rectification unit of rectification, be connected with the output of described rectification unit and the output of described bias voltage generation unit, the comparing unit that the voltage exported for the voltage that exports described rectification unit and described bias voltage generation unit compares.
4. audio signal detection control circuit as claimed in claim 2, it is characterized in that, described bias voltage generation unit comprises the first filter capacitor, the 4th resistance and the 5th resistance;
Feeder ear and the externally fed voltage of described audio signal amplifying unit is connected to after the first end of described first filter capacitor and the first end of described 4th resistance connect altogether, second end ground connection of described first filter capacitor, the second end of described 4th resistance and the first end of described 5th resistance connect the output forming described bias voltage generation unit altogether and are connected to described audio signal amplifying unit.
5. audio signal detection control circuit as claimed in claim 2, it is characterized in that, described audio signal amplifying unit comprises the first resistance, the second resistance and the first operational amplifier;
The first end of described first resistance is the audio input end of described audio signal detection module, the inverting input of described first operational amplifier is connected to after second end of described first resistance and the first end of described second resistance connect altogether, second end of described second resistance is connected to the output of described first operational amplifier and the input of described rectification unit, the normal phase input end of described first operational amplifier is connected to the output of described bias voltage generation unit, the feeder ear of described first operational amplifier is the feeder ear of described audio signal amplifying unit, the earth terminal ground connection of described first operational amplifier.
6. audio signal detection control circuit as claimed in claim 5, it is characterized in that, described rectification unit comprises rectifier diode and the 3rd resistance;
The anode of described rectifier diode is that the input of described rectification unit is connected to described audio signal amplifying unit, the negative electrode of described rectifier diode and the first end of described 3rd resistance connect the output forming described rectification unit altogether and are connected to described comparing unit, the second end ground connection of described 3rd resistance.
7. audio signal detection control circuit as claimed in claim 6, it is characterized in that, described comparing unit comprises the second operational amplifier and the 6th resistance;
The normal phase input end of described second operational amplifier is connected to the output of described rectification unit, the inverting input of described second operational amplifier is connected to the output of described bias voltage generation unit, and the output of described second operational amplifier is connected to described control module by described 6th resistance.
8. audio signal detection control circuit as claimed in claim 7, it is characterized in that, described control module comprises switching tube, the 4th electric capacity, the 5th electric capacity and the 7th resistance;
The control end of described switching tube is the input of described control module, be connected to the output of described comparing unit, externally fed voltage is connected to after the first end of the input of described switching tube, the first end of described 4th electric capacity and described 7th resistance connects altogether, second end of described 4th electric capacity and the second end of described 7th resistance connect rear ground connection altogether, the output of described switching tube and the first end of described 5th electric capacity connect the control end that the output forming described control module is connected to described switch element, the second end ground connection of described 5th electric capacity altogether.
9. audio signal detection control circuit as claimed in claim 7, it is characterized in that, described switching tube adopts metal-oxide-semiconductor, the base stage of described metal-oxide-semiconductor is the control end of described switching tube, the drain electrode of described metal-oxide-semiconductor is the input of described switching tube, and the source electrode of described metal-oxide-semiconductor is the output of described switching tube.
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| CN201520596832.4U CN204929213U (en) | 2015-08-10 | 2015-08-10 | Audio signal detects control circuit |
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| CN201520596832.4U CN204929213U (en) | 2015-08-10 | 2015-08-10 | Audio signal detects control circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107687891A (en) * | 2017-08-25 | 2018-02-13 | 苏州博众精工科技有限公司 | A kind of sound frequency harvester |
| CN108063599A (en) * | 2017-12-26 | 2018-05-22 | 深圳京柏医疗科技股份有限公司 | Audio amplifier circuit and its method of work |
| CN108200518A (en) * | 2018-03-07 | 2018-06-22 | 合肥惠科金扬科技有限公司 | A kind of voicefrequency circuit and audio frequency apparatus for eliminating powered on moment noise |
| CN111885462A (en) * | 2020-07-17 | 2020-11-03 | 上海艾为电子技术股份有限公司 | Audio power amplifier circuit, power amplifier mode control method thereof and electronic equipment |
| CN113345235A (en) * | 2021-06-07 | 2021-09-03 | 恒明星光智慧文化科技(深圳)有限公司 | Road intelligence emergency treatment device, sculpture, wisdom street lamp |
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2015
- 2015-08-10 CN CN201520596832.4U patent/CN204929213U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107687891A (en) * | 2017-08-25 | 2018-02-13 | 苏州博众精工科技有限公司 | A kind of sound frequency harvester |
| CN107687891B (en) * | 2017-08-25 | 2020-01-10 | 博众精工科技股份有限公司 | Sound frequency acquisition device |
| CN108063599A (en) * | 2017-12-26 | 2018-05-22 | 深圳京柏医疗科技股份有限公司 | Audio amplifier circuit and its method of work |
| CN108200518A (en) * | 2018-03-07 | 2018-06-22 | 合肥惠科金扬科技有限公司 | A kind of voicefrequency circuit and audio frequency apparatus for eliminating powered on moment noise |
| CN108200518B (en) * | 2018-03-07 | 2024-04-12 | 合肥惠科金扬科技有限公司 | Audio circuit and audio equipment for eliminating instant noise during power-on |
| CN111885462A (en) * | 2020-07-17 | 2020-11-03 | 上海艾为电子技术股份有限公司 | Audio power amplifier circuit, power amplifier mode control method thereof and electronic equipment |
| CN113345235A (en) * | 2021-06-07 | 2021-09-03 | 恒明星光智慧文化科技(深圳)有限公司 | Road intelligence emergency treatment device, sculpture, wisdom street lamp |
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Address after: Longgang District of Shenzhen City, Guangdong province 518116 Ping Street Takahashi Industrial Park East Area Patentee after: SHENZHE GUANXU ELECTRONIC CO., LTD. Address before: Longgang District of Shenzhen City, Guangdong province 518116 Ping Street Takahashi Industrial Park East Area Patentee before: Shenzhen Grandsun Electronic Co., Ltd. |