CN104469605A - Electronic device provided with audio control circuit - Google Patents
Electronic device provided with audio control circuit Download PDFInfo
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- CN104469605A CN104469605A CN201310420178.7A CN201310420178A CN104469605A CN 104469605 A CN104469605 A CN 104469605A CN 201310420178 A CN201310420178 A CN 201310420178A CN 104469605 A CN104469605 A CN 104469605A
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- Prior art keywords
- triode
- power amplifier
- mute
- output port
- diode
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Abstract
The invention provides an electronic device provided with an audio control circuit. The electronic device comprises a system decoding chip, a power amplification chip and an output port, wherein the power amplification chip is connected between the system decoding chip and the output port. The electronic device further comprises a micro control unit and an audio control unit, wherein the audio control unit is connected with the micro control unit and the power amplification chip; and the micro control unit is used for generating a GPIO (General Purpose Input/Output) control signal to the audio control unit at startup/shutdown to control the audio control signal to generate a mute control signal to the MUTE port of the power amplification chip in order that the power amplification chip executes a mute function without outputting any audio signal to the output port. According to the electronic device, the decoding chip is controlled to perform mute output at startup/shutdown, so that the generation of POP sound is effectively avoided.
Description
Technical field
The present invention relates to a kind of electronic installation of tool audio control circuit, particularly relate to a kind of electronic installation preventing switching on and shutting down from producing POP sound.
Background technology
Current portable electron device can produce plosive at audio signal output end when switching on and shutting down, i.e. POP sound, thus affects the normal use of user.
Summary of the invention
The invention provides a kind of electronic installation of tool audio control circuit.
A kind of electronic installation, comprise a system decodes chip, a power amplifier chips and an output port, wherein, power amplifier chips is connected between system decodes chip and output port, output port is for connecting output equipment, and the audio signal that system decodes chip is used for electronic installation produces is decoded, and power amplifier chips is for amplifying decoded audio signal, then export output equipment to by output port, this power amplifier chips comprises a MUTE port.This electronic installation also comprises a micro-control unit and an audio control circuit, audio control circuit connects micro-control unit and power amplifier chips, described micro-control unit produces a GPIO and controls signal to described audio control circuit when switching on and shutting down, and control described audio control signal and produce a quiet MUTE port controlling signal to power amplifier chips, make power amplifier chips perform mute function and not output audio signal to output port.
The electronic installation of tool audio control circuit of the present invention, controls the defeated quiet output of decoding chip in switching on and shutting down, thus effectively prevent generation POP sound.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the audio control circuit under the preferred embodiment for the present invention in electronic installation.
Main element symbol description
| Electronic installation | 1 |
| System decodes chip | 10 |
| Power amplifier chips | 20 |
| Output port | 30 |
| L channel | 301 |
| R channel | 302 |
| MCU | 40 |
| Audio control circuit | 50 |
| Quiet control signal produces circuit | 500 |
| First resistance | 501 |
| Second resistance | 502 |
| Resistance | 503，504，601，611 |
| Triode | 505 |
| First diode | 506 |
| Second diode | 507 |
| 3rd resistance | 508 |
| 4th resistance | 509 |
| L channel mute circuit | 60a |
| R channel mute circuit | 60b |
| Triode | 602，612 |
| Electric capacity | 603，613 |
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Referring to Fig. 1, is the circuit diagram of the audio control circuit under the preferred embodiment for the present invention in electronic installation.Electronic installation 1 comprises system decodes chip 10, power amplifier chips 20, output port 30, micro-control unit (MCU) 40 and an audio control circuit 50.Wherein, power amplifier chips 20 is connected between system decodes chip 10 and output port 30.Output port 30 is for the output equipment such as frames connecting with headphone or loudspeaker.System decodes chip 10 is decoded for the audio signal produced by electronic installation 1, and power amplifier chips 20, for amplifying decoded audio signal, then exports the output equipment such as earphone or loudspeaker to by output port 30.This power amplifier chips comprises a MUTE port.
Audio control circuit 50 connects micro-control unit 40 and power amplifier chips 20.Control unit 40 produces a GPIO and controls signal to audio control circuit 50 and control audio control circuit 50 and produce a quiet MUTE port controlling signal to power amplifier chips 20 when switching on and shutting down, power amplifier chips 20 is made to perform mute function, namely output audio signal, to output port 30, thus not effectively prevent power amplifier chips 20 and produces POP sound.
Concrete, audio control circuit 50 comprises a quiet control signal and produces circuit 500.This quiet control signal produces circuit 500 and comprises one first resistance 501,1 second resistance 502, one triode 505,1 first diode 506,1 second diode 507, the 3rd resistance 508 and one the 4th resistance 509.
Wherein, the emitter of triode 505 connects described voltage end Vcc, collector electrode connects the anode of described first diode 506 and the second diode 507, and base stage is electrically connected with this micro-control unit 40, connects described voltage end Vcc and by the second resistance 502 ground connection by this first resistance 501 simultaneously.The negative electrode of the first diode 506, by the 4th resistance 509 ground connection, connects the MUTE port of power amplifier chips simultaneously.The negative electrode of the second diode 507 is by the 3rd resistance 508 ground connection.Wherein, this voltage end Vcc can be connected with the battery (not shown) of electronic installation 1 and obtain a high level voltage, the voltage of such as 5V.
In the present embodiment, this triode 505 is a PNP triode.In the present embodiment, this GPIO control signal is low level, and this quiet control signal is a high level signal.
When micro-control unit 40 produces low level GPIO control signal, the base stage of triode 505 receives this low level and makes this triode 505 conducting, then the collector electrode of triode 505 exports high level, make the first diode 506 conducting, the negative electrode of the first diode 506 exports the quiet MUTE port controlling signal to power amplifier chips 20 of a high level, thus make power amplifier chips 20 perform mute function, effectively prevent power amplifier chips 20 and produce POP sound when switching on and shutting down.
Audio control circuit 50 also comprises an a L channel mute circuit 60a and R channel mute circuit 60b.The input of L channel mute circuit 60a and R channel mute circuit 60b is connected to the negative electrode of the second diode 507 jointly, and output connects left and right two sound channel 301,302 of output port 30 respectively.L channel mute circuit 60a and R channel mute circuit 60b has identical internal structure.
Concrete, L channel mute circuit 60a comprises triode 602 and an electric capacity 603.The base stage of triode 602 is electrically connected with this input and is connected with the cathodic electricity of this diode 507, the emitter grounding of triode 602, and collector electrode connects the left channel pin 301 of output port 30.Between the collector electrode that electric capacity 603 is connected to triode 602 and emitter-base bandgap grading.R channel mute circuit 60b comprises triode 612 and an electric capacity 613.The base stage of triode 612 is electrically connected the input of this R channel mute circuit 60b and is connected with the cathodic electricity of this diode 507, the emitter grounding of triode 612, and collector electrode connects the R channel pin 302 of output port 30.Between the collector electrode that electric capacity 613 is connected to triode 612 and emitter-base bandgap grading.
In the present embodiment, this triode 602 and 612 is NPN triode.
When MCU40 produces low level GPIO control signal, triode 505 conducting, then the emitter-base bandgap grading of triode 505 exports high level, and make the second diode 507 conducting, the negative electrode of the second diode 506 exports the common input end of a high level to L channel mute circuit 60a and R channel mute circuit 60b.
The base stage of triode 602 receives this high level, makes triode 602 conducting, and the left channel pin 301 of output port 30 passes through triode 602 ground connection of this conducting.Simultaneously, the base stage of triode 612 receives this high level, make triode 612 conducting, the R channel of output port 30 passes through the triode 612 also ground connection of this conducting, thus will the signal ground connection of the left and right acoustic channels of output port 30 be sent to, when again effectively prevent external device (ED) connection output port 30, during as plug external device, the POP sound of generation.
Claims (5)
1. an electronic installation, comprise a system decodes chip, a power amplifier chips and an output port, wherein, power amplifier chips is connected between system decodes chip and output port, and output port is for connecting output equipment, and the audio signal that system decodes chip is used for electronic installation produces is decoded, power amplifier chips is for amplifying decoded audio signal, then export output equipment to by output port, this power amplifier chips comprises a MUTE port, it is characterized in that:
This electronic installation also comprises a micro-control unit and an audio control circuit, audio control circuit connects micro-control unit and power amplifier chips, described micro-control unit produces a GPIO and controls signal to described audio control circuit when switching on and shutting down, and control described audio control signal and produce a quiet MUTE port controlling signal to power amplifier chips, make power amplifier chips perform mute function and not output audio signal to output port.
2. electronic installation as claimed in claim 1, it is characterized in that, this audio control circuit comprises a quiet control signal and produces circuit, this quiet control signal produces circuit, comprise one first resistance, one second resistance, first triode, one first diode, one second diode, one the 3rd resistance and one the 4th resistance, wherein, the emitter of the first triode connects described voltage end Vcc, collector electrode connects the anode of described first diode and the second diode, base stage is electrically connected with this micro-control unit, connect described voltage end Vcc by this first resistance and by the second grounding through resistance simultaneously, the negative electrode of the first diode is by the 4th grounding through resistance, connect the MUTE port of power amplifier chips simultaneously, the negative electrode of the second diode is by the 3rd grounding through resistance.
3. electronic installation as claimed in claim 2, is characterized in that, the GPIO control signal that this micro-control unit produces is low level signal, and described first triode is a PNP triode; When micro-control unit produces low level GPIO control signal, the base stage of the first triode receives this low level and makes this triode ON, then the collector electrode of the first triode exports high level, make the first diode current flow, the negative electrode of the first diode exports the MUTE port of a high level to power amplifier chips, thus make power amplifier chips perform mute function, effectively prevent power amplifier chips and produce POP sound when switching on and shutting down.
4. electronic installation as claimed in claim 2, it is characterized in that, described L channel mute circuit comprises one second triode and one first electric capacity, the base stage of the second triode is electrically connected with this input and is connected with the cathodic electricity of this diode, the emitter grounding of the second triode, collector electrode connects the left channel pin of output port, between the collector electrode that the first electric capacity is connected to the second triode and emitter-base bandgap grading; R channel mute circuit comprises one the 3rd triode and one second electric capacity, the base stage of the 3rd triode is electrically connected the input of this R channel mute circuit and is connected with the cathodic electricity of this diode, the emitter grounding of the 3rd triode, collector electrode connects the R channel pin of output port, between the collector electrode that the second electric capacity is connected to the 3rd triode and emitter-base bandgap grading.
5. electronic installation as claimed in claim 4, it is characterized in that, the GPIO control signal that described micro-control unit produces is low level signal, this second triode and the 3rd triode are NPN triode, when MCU produces low level GPIO control signal, quiet control signal produces the first triode ON of circuit, then emitter-base bandgap grading exports high level, makes quiet control signal produce the second diode current flow negative electrode of circuit and exports the common input end of a high level to L channel mute circuit and R channel mute circuit; The base stage of the second triode of L channel mute circuit receives this high level, makes the second triode ON, and the left channel pin of output port passes through the second triode ground connection of this conducting; Meanwhile, the base stage of the 3rd triode of R channel mute circuit receives this high level, makes the 3rd triode ON, and the R channel of output port passes through the 3rd triode also ground connection of this conducting, thus will be sent to the signal ground connection of the left and right acoustic channels of output port.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310420178.7A CN104469605A (en) | 2013-09-16 | 2013-09-16 | Electronic device provided with audio control circuit |
| TW102134394A TW201513564A (en) | 2013-09-16 | 2013-09-24 | Electronic device with audio control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310420178.7A CN104469605A (en) | 2013-09-16 | 2013-09-16 | Electronic device provided with audio control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104469605A true CN104469605A (en) | 2015-03-25 |
Family
ID=52914841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310420178.7A Pending CN104469605A (en) | 2013-09-16 | 2013-09-16 | Electronic device provided with audio control circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104469605A (en) |
| TW (1) | TW201513564A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105357610A (en) * | 2015-11-16 | 2016-02-24 | 宁波音王电声股份有限公司 | Microphone |
| CN106375903A (en) * | 2016-10-27 | 2017-02-01 | 福建星海通信科技有限公司 | Circuit and method thereof used for detecting and controlling audio playback device |
| CN106686492A (en) * | 2017-01-22 | 2017-05-17 | 深圳市华星光电技术有限公司 | Audio output circuit and audio device |
| WO2022155912A1 (en) * | 2021-01-22 | 2022-07-28 | 深圳欣锐科技股份有限公司 | Control circuit of bidirectional charging system and vehicle-mounted bidirectional charger |
| CN116112846A (en) * | 2022-10-08 | 2023-05-12 | 广州市保伦电子有限公司 | Restarting impact sound eliminating circuit and audio circuit |
-
2013
- 2013-09-16 CN CN201310420178.7A patent/CN104469605A/en active Pending
- 2013-09-24 TW TW102134394A patent/TW201513564A/en unknown
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105357610A (en) * | 2015-11-16 | 2016-02-24 | 宁波音王电声股份有限公司 | Microphone |
| CN106375903A (en) * | 2016-10-27 | 2017-02-01 | 福建星海通信科技有限公司 | Circuit and method thereof used for detecting and controlling audio playback device |
| CN106686492A (en) * | 2017-01-22 | 2017-05-17 | 深圳市华星光电技术有限公司 | Audio output circuit and audio device |
| CN106686492B (en) * | 2017-01-22 | 2019-06-25 | 深圳市华星光电技术有限公司 | A kind of audio output circuit and audio frequency apparatus |
| WO2022155912A1 (en) * | 2021-01-22 | 2022-07-28 | 深圳欣锐科技股份有限公司 | Control circuit of bidirectional charging system and vehicle-mounted bidirectional charger |
| CN116112846A (en) * | 2022-10-08 | 2023-05-12 | 广州市保伦电子有限公司 | Restarting impact sound eliminating circuit and audio circuit |
| CN116112846B (en) * | 2022-10-08 | 2024-01-30 | 广东保伦电子股份有限公司 | Restarting impact sound eliminating circuit and audio circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201513564A (en) | 2015-04-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150325 |
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| WD01 | Invention patent application deemed withdrawn after publication |