CN203193857U - Audio frequency signal synthesis drive circuit - Google Patents
Audio frequency signal synthesis drive circuit Download PDFInfo
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- CN203193857U CN203193857U CN 201320077098 CN201320077098U CN203193857U CN 203193857 U CN203193857 U CN 203193857U CN 201320077098 CN201320077098 CN 201320077098 CN 201320077098 U CN201320077098 U CN 201320077098U CN 203193857 U CN203193857 U CN 203193857U
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Abstract
An audio frequency signal synthesis drive circuit is disclosed, comprising an audio frequency control unit, a loudness control unit, an audio frequency driving unit, and a sounding device. The audio frequency signal synthesis drive circuit is characterized in that the audio frequency control unit is connected with the loudness control unit, the loudness control unit controls amplitude of audio frequency square wave signals generated by the audio frequency control unit, the audio frequency driving unit is respectively connected with the audio frequency control unit and the loudness control unit, and the audio frequency driving unit is also connected with the sounding device. After the audio frequency square wave signals are adjusted by the loudness control unit, the audio frequency square wave signals are amplified by the audio frequency driving unit and then drive the sounding device to produce sound. The audio frequency signal synthesis drive circuit is advantaged by strong driving capability of the audio frequency drive circuit, small noise, good sound quality, low energy consumption, and the like. Music sound produced through combination of two of controls signals which are an audio frequency control signal and a loudness control signal.
Description
Technical field
The utility model relates to the synthetic field of audio signal, especially relates to the synthetic drive circuit of a kind of buzzer or loudspeaker audio signal.
Background technology
At present electronic product mainly is that square-wave signal by the electroacoustic component of inside directly drives buzzer as: the prompt tone on computer, multimedia, household electrical appliance, electronic toy, automatic control device and each electronic product, its circuit easily exists output unstable, the problem that output current is excessive.Existing buzzer circuit adopts frequency signal output more, amplifies the back and adopts the half-bridge circuit driving transformer to produce the circuit of voice signal.Because single-ended amplifier intelligence takes single operating state, its operating efficiency is not high, and high, the buzzing sheet electric current instability of power end electric current output, thereby has that reliability is low, voice output is unstable, consumed power is many.For the better sound effect that obtains, some is improved to music circuit, divides two the tunnel to control one road control frequency, one tunnel control beat, though these improved music circuits have remedied above shortcomings, but still exist noise bigger, a little less than the driving force, and need shortcomings such as multi-group power.
Summary of the invention
The utility model purpose provides the synthetic drive circuit of a kind of audio signal.With solve existing in prior technology audio drive circuitry driving force a little less than, technical problem such as noise is big, tonequality is not ideal enough, consumed power is many.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of audio signal is synthesized drive circuit, comprises audio frequency control unit, loudness control unit, audio driven unit, microphone device; Described audio frequency control unit is connected with the loudness control unit, the amplitude of the audio frequency square-wave signal that loudness control unit control audio frequency control unit produces, described audio driven unit is connected with audio frequency control unit, loudness control unit respectively, and this audio driven unit also is connected with microphone device; After described loudness control unit is adjusted the audio frequency square-wave signal, amplify and driving microphone device sounding by the audio driven unit.
As preferably, described audio frequency control unit comprises MCU, PWM, coupling capacitance C1, resistance R 2, resistance R 5, resistance R 6, described MCU produces the audio frequency square-wave signal by PWM and is coupled on resistance R 2, resistance R 5, the resistance R 6 by coupling capacitance C1, and sends the audio driven unit to after resistance R 2, resistance R 5, resistance R 6 dividing potential drops.
As preferably, described loudness control unit comprises triode Q1, resistance R 1, resistance R 3, resistance R 4, and wherein resistance R 1, resistance R 3 are connected with the base stage of triode Q1, resistance R 3 ground connection, and the collector electrode of described triode Q1 is connected with resistance R 4.
As preferably, described audio driven unit comprises Music Clip U1, and this Music Clip U1 is the LM386 integrated power amplifier.
As preferably, the 3rd pin 3 of described Music Clip U1 is connected with the low pass filter that resistance R 7 and capacitor C 2 are formed, and second pin 2 is connected with the emitter of triode Q1; Described Music Clip U1 the 5th pin 5 is connected with the low pass filter that resistance R 8 and capacitor C 5 are formed, and the low pass filter that resistance R 8 and capacitor C 5 are formed is by capacitor C 6 couple drive BZ1 acoustical generator sounding.
It is stronger to the utlity model has the audio drive circuitry driving force, advantages such as noise is less, tonequality good, low energy consumption.By two tunnel control signals, one road audio frequency control signal, one tunnel loudness control signal combines and sends musical sound.Reasonably audio frequency signal and loudness signal are combined with resistance R 2, R4, R5, R6 and triode Q1 by capacitor C 1.This circuit is will drive triode to change to LM386 and drive microphone device on the basis of music circuit circuit, and it is little to have noise like this, and driving force is strong, does not need multi-group power.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is further described in detail.
Fig. 1 is circuit theory diagrams of the present utility model.As shown in Figure 1, a kind of audio signal is synthesized drive circuit, mainly is made up of audio frequency control unit, loudness control unit, audio driven unit, microphone device etc.; Described audio frequency control unit is connected with the loudness control unit, the amplitude of the audio frequency square-wave signal that loudness control unit control audio frequency control unit produces, described audio driven unit is connected with audio frequency control unit, loudness control unit respectively, and this audio driven unit also is connected with microphone device; After described loudness control unit is adjusted the audio frequency square-wave signal, amplify and driving microphone device sounding by the audio driven unit.
The audio frequency control unit comprises MCU, PWM, coupling capacitance C1, resistance R 2, resistance R 5, resistance R 6, described MCU produces the audio frequency square-wave signal by PWM and is coupled on resistance R 2, resistance R 5, the resistance R 6 by coupling capacitance C1, and sends the audio driven unit to after resistance R 2, resistance R 5, resistance R 6 dividing potential drops.
The loudness control unit comprises triode Q1, resistance R 1, resistance R 3, resistance R 4, and wherein resistance R 1, resistance R 3 are connected with the base stage of triode Q1, resistance R 3 ground connection, and the collector electrode of described triode Q1 is connected with resistance R 4.
The audio driven unit comprises Music Clip U1, and this Music Clip U1 is the LM386 integrated power amplifier, and the 3rd pin 3 of this Music Clip U1 is connected with the low pass filter that resistance R 7 and capacitor C 2 are formed, and second pin 2 is connected with the emitter of triode Q1; Described Music Clip U1 the 5th pin 5 is connected with the low pass filter that resistance R 8 and capacitor C 5 are formed, the low pass filter that resistance R 8 and capacitor C 5 are formed is by capacitor C 6 couple drive BZ1 acoustical generator sounding, the 7th pin 7 external bypass decoupling capacitor C 3 of this Music Clip U1 are formed high pass filter, suppress ability in order to improve ripple, eliminate the low frequency self-excitation.
MCU enters from the A point by the audio frequency square-wave signal that PWM produces, by the C1 coupling capacitance, after resistance R 2, resistance R 5, resistance R 6 dividing potential drops, send 3 pin of LM386 to, loudness signal enters by the B point, by triode Q1 and resistance R 4, the amplitude of control signal A, the audio signal after being adjusted drive the microphone device sounding through capacitor C 6 after amplifying by LM386.By the frequency of change A point input and the amplitude of B point input, just can be combined into various pleasing to the ear musical sounds.
Working method and process:
MCU enters from the A point by the audio frequency square-wave signal that PWM produces, square-wave signal is coupled on R2, R5, the R6 by C1, because the charging and discharging circuit of C1 is R2, R5, R6, so R2, R5, the last formation of R6 triangular wave, during A point high level, R5 and R6 tie point voltage positive voltage occurs because of the charging current of C1, when A point low-voltage, R5 and R6 tie point voltage negative voltage occurs because of the discharging current of C1, and the positive negative signal of R5 and R6 tie point removes positive input the 3rd pin 3 that enters LM386 behind the high-frequency noise through the low pass filter of R7 and C2 composition again.
Another road signal is entered by the B point, by driving triode Q1 after R1 and the R3 dividing potential drop resistance R 4 is connected to ground.Because of resistance R 3 ground connection, during when B point no signal or less than 1.4V, triode Q1 carries that only R4 is inoperative.A-signal when B point saturation conduction, passes to back level high pass filter directly by passing to the back level after R2, R5, the R6 dividing potential drop again after R2, R4, four resistivity dividing potential drops of R5, R6.
The low pass filter that 2 pin of LM386 and 3 pin signals are formed through R8 and C5 after amplifying again remove high-frequency noise afterwards again process capacitor C 6 couple drive BZ1 microphone devices send musical sound.Advantages such as two tunnel audio signal reasonable combination are amplified output through LM386 afterwards again, and it is strong to satisfy driving force, and audio is good, and stand-by power consumption is low.Can promote at household appliances.
Claims (5)
1. the synthetic drive circuit of audio signal comprises audio frequency control unit, loudness control unit, audio driven unit, microphone device; It is characterized in that, described audio frequency control unit is connected with the loudness control unit, the amplitude of the audio frequency square-wave signal that loudness control unit control audio frequency control unit produces, described audio driven unit is connected with audio frequency control unit, loudness control unit respectively, and this audio driven unit also is connected with microphone device; After described loudness control unit is adjusted the audio frequency square-wave signal, amplify and driving microphone device sounding by the audio driven unit.
2. a kind of audio signal according to claim 1 is synthesized drive circuit, it is characterized in that, described audio frequency control unit comprises MCU, PWM, coupling capacitance C1, resistance R 2, resistance R 5, resistance R 6, described MCU produces the audio frequency square-wave signal by PWM and is coupled on resistance R 2, resistance R 5, the resistance R 6 by coupling capacitance C1, and sends the audio driven unit to after resistance R 2, resistance R 5, resistance R 6 dividing potential drops.
3. a kind of audio signal according to claim 1 is synthesized drive circuit, it is characterized in that, described loudness control unit comprises triode Q1, resistance R 1, resistance R 3, resistance R 4, wherein resistance R 1, resistance R 3 are connected with the base stage of triode Q1, resistance R 3 ground connection, the collector electrode of described triode Q1 is connected with resistance R 4.
4. the synthetic drive circuit of a kind of audio signal according to claim 1 is characterized in that described audio driven unit comprises Music Clip U1, and this Music Clip U1 is the LM386 integrated power amplifier.
5. the synthetic drive circuit of a kind of audio signal according to claim 4 is characterized in that, the 3rd pin 3 of described Music Clip U1 is connected with the low pass filter that resistance R 7 and capacitor C 2 are formed, and second pin 2 is connected with the emitter of triode Q1; Described Music Clip U1 the 5th pin 5 is connected with the low pass filter that resistance R 8 and capacitor C 5 are formed, and the low pass filter that resistance R 8 and capacitor C 5 are formed is by capacitor C 6 couple drive BZ1 acoustical generator sounding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320077098 CN203193857U (en) | 2013-02-19 | 2013-02-19 | Audio frequency signal synthesis drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320077098 CN203193857U (en) | 2013-02-19 | 2013-02-19 | Audio frequency signal synthesis drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203193857U true CN203193857U (en) | 2013-09-11 |
Family
ID=49110679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320077098 Expired - Lifetime CN203193857U (en) | 2013-02-19 | 2013-02-19 | Audio frequency signal synthesis drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203193857U (en) |
-
2013
- 2013-02-19 CN CN 201320077098 patent/CN203193857U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518000 Guangdong city in Shenzhen Province, Baoan District Whampoa manhole Street East Ring Road No. 148 building, third industrial park is the wind Patentee after: SHENZHEN LONGTECH SMART CONTROL Co.,Ltd. Address before: 518000 Guangdong city in Shenzhen Province, Baoan District Whampoa manhole Street East Ring Road No. 148 building, third industrial park is the wind Patentee before: Shenzhen Longtech Electronics Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20130911 |
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| CX01 | Expiry of patent term |