CN201216013Y - Mute circuit for earphone - Google Patents
Mute circuit for earphone Download PDFInfo
- Publication number
- CN201216013Y CN201216013Y CNU2008200237680U CN200820023768U CN201216013Y CN 201216013 Y CN201216013 Y CN 201216013Y CN U2008200237680 U CNU2008200237680 U CN U2008200237680U CN 200820023768 U CN200820023768 U CN 200820023768U CN 201216013 Y CN201216013 Y CN 201216013Y
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- earphone
- power amplifier
- amplifier module
- module
- quiet
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Abstract
The utility model discloses an earphone muting circuit, which comprises an earphone power amplifier module and an audio power amplifier module, and further comprises an earphone muting control module, wherein the earphone muting control module is respectively connected with the earphone power amplifier module and the audio power amplifier module, the earphone muting control module can control the audio power amplifier module to mute when the earphone is inserted, and the earphone muting control module is muted when the earphone is not inserted. The earphone muting circuit changes a mechanical switch type in the original technique into an induction type, which leads a power amplifier of the earphone to be located in a muting state when a main power amplifier works, the power consumption is saved, the volume is reduced than before, and the volume occupied a PCB board is reduced.
Description
Technical field
The utility model relates to a kind of improvement of TV set circuit, specifically, relates to a kind of television set that is used for and realizes the quiet control circuit of earphone.
Background technology
At present, along with the develop rapidly of TV tech,, on many television sets, all be equipped with head circuit for satisfying the growing multiple demand of consumer.When the user appreciates TV programme,, can realize quiet to audio amplifier by earphone being inserted earphone socket on the television set for other people have a rest around not influencing.Existing television set generally can pass through main loudspeaker sounding or earphone sounding, and when inserting earphone, main loudspeaker is quiet; When not having earphone to insert, the loud speaker sounding.Traditional earphone mute circuit adopts mechanical type more, and as shown in Figure 1, when not inserting earphone, the mechanical switch of earphone disconnects, and the SHUTDOWN pin is unsettled, the main loudspeaker pronunciation.When inserting earphone, the mechanical switch closure that is connected with SHUTDOWN, SHUTDOWN pin shorted to earth, the SHUTDOWN pin of the main power amplifier chip that is attached thereto is effective, makes winner's power amplifier chip quiet.The earphone terminal that this design is adopted is relatively large, and the area that takies pcb board is bigger, and when not inserting earphone, the earphone power amplifier is in running order, and power consumed is big.
The utility model content
Main purpose of the present utility model provides a kind of earphone mute circuit of induction type, and when this circuit made audio frequency power amplifier module work, the earphone power amplifier was in mute state, saves power consumption, and volume reduces the feasible volume minimizing that takies pcb board than before to some extent.
The utility model adopts following technical scheme to realize goal of the invention:
A kind of earphone mute circuit, comprise earphone power amplifier module and audio frequency power amplifier module, in addition, also comprise the quiet control module of earphone, the quiet control module of described earphone is connected with earphone power amplifier module, audio frequency power amplifier module respectively, described audio frequency power amplifier module was quiet when the quiet control module of this earphone can be controlled the insertion earphone, and described earphone power amplifier module is quiet when not inserting earphone.
In order to save cost, simplify circuit structure, the utility model adopts power amplifier chip and discrete component to set up described earphone mute circuit, and it is specifically formed structure and can adopt following dual mode to realize:
A kind of structure is: the quiet control module of described earphone comprises control circuit and is attached thereto the signal controlling module that connects; Described control circuit comprises two signal output parts, one of them signal output part connects the sound output of described earphone power amplifier module, another signal output part connects the quiet end of described signal controlling module and described audio frequency power amplifier module respectively, and the signal output part of described signal controlling module connects the quiet end of described earphone power amplifier module; Described signal controlling module is CPU; Described control circuit comprises control switch Q1, discrete component resistance R 1, R2, R3, R4, R5 and capacitor C 1, C2, C3; Described control switch Q1 is a NPN type triode, and the base stage of described NPN type triode is connected the sound output of described earphone power amplifier module by divider resistance R2, R3, and collector electrode connects supply voltage, grounded emitter by divider resistance R1.
Another kind of structure is: the quiet control module of described earphone is a signal control circuit, described signal control circuit comprises two signal output parts, one of them signal output part connects the sound output of described earphone power amplifier module, and another signal output part connects the quiet end of described audio frequency power amplifier module, the quiet end of described earphone power amplifier module respectively; Described signal control circuit comprises control switch Q1, discrete component resistance R 1, R2, R3, R4, R5 and capacitor C 1, C2, C3; Described control switch Q1 is a NPN type triode, and the base stage of described NPN type triode is connected the sound output of described earphone power amplifier module by divider resistance R2, R3, and collector electrode connects supply voltage, grounded emitter by divider resistance R1.
The earphone power amplifier module that above-mentioned two kinds of structures adopt is that a model is the earphone power amplifier chip of BH3547F.
Compared with prior art, of the present utility model a bit and good effect be: earphone electrostatic circuit of the present utility model comprises earphone power amplifier module and audio frequency power amplifier module, increased the quiet control module of earphone in addition newly, the quiet control module of earphone comprises two signal output ports, one of them signal output part connects the sound output of earphone power amplifier module, another signal output part connects the quiet end of earphone power amplifier module respectively, the quiet end of audio frequency power amplifier module, audio frequency power amplifier module was quiet when the quiet control module of this earphone can be controlled the insertion earphone, and the earphone power amplifier module is quiet when not inserting earphone.The utility model becomes induction type with the mechanical switch mode of original technology, and when making winner's power amplifier work, the earphone power amplifier is in mute state, saves power consumption, and volume reduces the feasible volume minimizing that takies pcb board than before to some extent.
Description of drawings
The earphone mute circuit schematic diagram of Fig. 1 for using in the existing television set.
Fig. 2 is wherein a kind of signal controlling flow chart of preferred embodiment of the utility model.
Fig. 3 is the signal controlling flow chart of another preferred embodiment of the utility model.
Fig. 4 is the particular circuit configurations figure of the utility model preferred embodiment control circuit.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment the utility model is done further to describe in detail.
Earphone electrostatic circuit of the present utility model comprises earphone power amplifier module and audio frequency power amplifier module, increased the quiet control module of earphone in addition newly, control the quiet end of earphone power amplifier module and audio frequency power amplifier module respectively by the quiet control module of earphone, when inserting earphone, audio frequency power amplifier module is quiet, and sound is by the output of earphone power amplifier module, when extracting earphone, earphone is quiet, the audio frequency power amplifier module sounding.The utility model becomes induction type with the mechanical switch mode of original technology, and when making winner's power amplifier work, the earphone power amplifier is in mute state, saves power consumption, and volume reduces the feasible volume minimizing that takies pcb board than before to some extent.
The utility model adopts power amplifier chip and discrete component to set up described mute circuit, and concrete circuit structure is as follows:
Embodiment one, referring to Fig. 2, the quiet control module of earphone comprises control circuit and is attached thereto the signal controlling module that connects, control circuit comprises two signal output parts, one of them signal output part connects the sound output OUT2 of described earphone power amplifier module, another signal output part connects the quiet end SHUTDOWN of described signal controlling module and described audio frequency power amplifier module respectively, the signal output part of described signal controlling module connects the quiet end MUTE of described earphone power amplifier module, in the present embodiment, the signal controlling module is CPU.
The concrete circuit of present embodiment is formed structure referring to Fig. 4, and described control circuit comprises control switch Q1, discrete component resistance R 1, R2, R3, R4, R5 and capacitor C 1, C2, C3; Described control switch Q1 is a NPN type triode, and the base stage of described NPN type triode is connected the sound output of described earphone power amplifier module by divider resistance R4, R5, and collector electrode connects supply voltage, grounded emitter by divider resistance R3.Present embodiment adopts earphone power amplifier chip BH3547F, the OUTA pin of earphone power amplifier chip BH3547F is connected DC power supply with capacitor C 1 serial connection back by divider resistance R1, simultaneously by divider resistance R2 ground connection, filter capacitor C2 is connected between the MUTE pin and ground of chip BH3547F, the MUTE pin low level of this chip is effective, and an end of capacitor C 3 is by the base stage of resistance R 4 connection triode Q1, other end ground connection, the effect of capacitor C 3 is to filter the pulse that changes in the circuit, reduces ripple factor.
Referring to Fig. 2, the concrete course of work of Fig. 4 present embodiment be: when earphone does not insert, during the main loudspeaker sounding, direct voltage obtains a voltage through the dividing potential drop of R1 and R2 divider resistance, after the stack of the sound accompaniment voltage of this voltage and output through divider resistance R5, R4, arrive the base stage of Q1, this triode is in conducting state, its collector electrode is in low level, the output signal HP_PLUG_INT of collector electrode connects CPU, CPU connects the MUTE pin of earphone power amplifier chip by pin, the MUTE pin receives the low level useful signal, controls the quiet of earphone power amplifier.When inserting earphone, the impedance of earphone itself can be very little with its resistance after R2 is in parallel, like this R2 divide voltage can be very low, less than 0.7V, at this moment Q1 ends, the collector electrode of Q1 presents high level signal HP_PLUG_INT, and this HP_PLUG_INT signal is connected the SHUTDOWN pin of audio frequency power amplifier module, and it is quiet to control main power amplifier, simultaneously, this HP_PLUG_INT signal is a high level by the MUTE pin of CPU control chip BH3547F, and the MUTE input signal is invalid, earphone power amplifier sounding.
Embodiment two, referring to Fig. 3, Fig. 4, the control circuit structure of present embodiment and embodiment 1 is the same, difference is that the HP_PLUG_INT output signal of embodiment one connects CPU earlier, the pin of CPU is being connected on the MUTE pin then, and present embodiment HP_PLUG_INT output signal is directly connected on the MUTE pin.
Present embodiment circuit working flow process is: when earphone does not insert, during the main loudspeaker sounding, direct voltage obtains a voltage through the dividing potential drop of R1 and R2 divider resistance, through divider resistance R5, R4, arrive the base stage of Q1 after the sound accompaniment voltage stack of this voltage and output, this triode is in conducting state, its collector electrode is in low level, the output signal HP_PLUG_INT of collector electrode is input to the MUTE pin, and signal is effective, and the earphone power amplifier is quiet.When inserting earphone, the impedance of earphone itself can be very little with its resistance after R2 is in parallel, like this R2 divide voltage can be very low, less than 0.7V, at this moment Q1 ends, the collector electrode of Q1 presents high level signal HP_PLUG_INT, and this HP_PLUG_INT signal is connected the SHUTDOWN pin of audio frequency power amplifier module, and it is quiet to control main power amplifier, simultaneously, the MUTE pin that receives the HP_PLUG_INT signal is a high level, and the MUTE input signal is invalid, earphone power amplifier sounding.
Certainly; above-mentioned explanation is not to restriction of the present utility model; the utility model also is not limited only to above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also belong to protection range of the present utility model.
Claims (10)
1, a kind of earphone mute circuit, comprise earphone power amplifier module and audio frequency power amplifier module, it is characterized in that: also comprise the quiet control module of earphone, the quiet control module of described earphone is connected with earphone power amplifier module, audio frequency power amplifier module respectively, described audio frequency power amplifier module was quiet when the quiet control module of this earphone can be controlled the insertion earphone, and described earphone power amplifier module is quiet when not inserting earphone.
2, earphone mute circuit according to claim 1 is characterized in that: the quiet control module of described earphone comprises control circuit and is attached thereto the signal controlling module that connects.
3, earphone mute circuit according to claim 2, it is characterized in that: described control circuit comprises two signal output parts, one of them signal output part connects the sound output of described earphone power amplifier module, another signal output part connects the quiet end of described signal controlling module and described audio frequency power amplifier module respectively, and the signal output part of described signal controlling module connects the quiet end of described earphone power amplifier module.
4, according to claim 2 or 3 described earphone mute circuits, it is characterized in that: described signal controlling module is CPU.
5, according to claim 2 or 3 described earphone mute circuits, it is characterized in that: described control circuit comprises control switch Q1, discrete component resistance R 1, R2, R3, R4, R5 and capacitor C 1, C2, C3.
6, earphone mute circuit according to claim 5, it is characterized in that: described control switch Q1 is a NPN type triode, the base stage of described NPN type triode is connected the sound output of described earphone power amplifier module by divider resistance R2, R3, collector electrode connects supply voltage, grounded emitter by divider resistance R1.
7, earphone mute circuit according to claim 1, it is characterized in that: the quiet control module of described earphone is a signal control circuit, described signal control circuit comprises two signal output parts, one of them signal output part connects the sound output of described earphone power amplifier module, and another signal output part connects the quiet end of described audio frequency power amplifier module, the quiet end of described earphone power amplifier module respectively.
8, earphone mute circuit according to claim 7, it is characterized in that: described signal control circuit comprises control switch Q1, discrete component resistance R 1, R2, R3, R4, R5 and capacitor C 1, C2, C3.
9, earphone mute circuit according to claim 8, it is characterized in that: described control switch Q1 is a NPN type triode, the base stage of described NPN type triode is connected the sound output of described earphone power amplifier module by divider resistance R2, R3, collector electrode connects supply voltage, grounded emitter by divider resistance R1.
10, according to the described earphone mute circuit of one of claim 1-9, it is characterized in that: described earphone power amplifier module is that a model is the earphone power amplifier chip of BH3547F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200237680U CN201216013Y (en) | 2008-06-06 | 2008-06-06 | Mute circuit for earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200237680U CN201216013Y (en) | 2008-06-06 | 2008-06-06 | Mute circuit for earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201216013Y true CN201216013Y (en) | 2009-04-01 |
Family
ID=40521218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200237680U Expired - Fee Related CN201216013Y (en) | 2008-06-06 | 2008-06-06 | Mute circuit for earphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201216013Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103022831A (en) * | 2012-12-30 | 2013-04-03 | 青岛歌尔声学科技有限公司 | Earphone socket, earphone noise reduction device and earphone socket implementation method |
| CN101742383B (en) * | 2009-12-15 | 2013-06-05 | 中兴通讯股份有限公司 | Device and method for eliminating plosives of headset |
| CN111309282A (en) * | 2020-02-11 | 2020-06-19 | RealMe重庆移动通信有限公司 | Audio device power consumption control method and device, audio device and storage medium |
-
2008
- 2008-06-06 CN CNU2008200237680U patent/CN201216013Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101742383B (en) * | 2009-12-15 | 2013-06-05 | 中兴通讯股份有限公司 | Device and method for eliminating plosives of headset |
| CN103022831A (en) * | 2012-12-30 | 2013-04-03 | 青岛歌尔声学科技有限公司 | Earphone socket, earphone noise reduction device and earphone socket implementation method |
| CN111309282A (en) * | 2020-02-11 | 2020-06-19 | RealMe重庆移动通信有限公司 | Audio device power consumption control method and device, audio device and storage medium |
| CN111309282B (en) * | 2020-02-11 | 2023-08-22 | RealMe重庆移动通信有限公司 | Audio equipment power consumption control method and device, audio equipment and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090401 Termination date: 20130606 |