CN202353794U - Power amplifier with automatic mute priority function - Google Patents
Power amplifier with automatic mute priority function Download PDFInfo
- Publication number
- CN202353794U CN202353794U CN2011204902425U CN201120490242U CN202353794U CN 202353794 U CN202353794 U CN 202353794U CN 2011204902425 U CN2011204902425 U CN 2011204902425U CN 201120490242 U CN201120490242 U CN 201120490242U CN 202353794 U CN202353794 U CN 202353794U
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- voice signal
- circuit
- amplifying circuit
- input
- power amplifier
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Abstract
The utility model discloses a power amplifier with an automatic mute priority function. The power amplifier comprises a voice signal input terminal, a voice signal amplifying circuit, a music signal input terminal and a music signal amplifying circuit, wherein the voice signal input terminal is connected with the voice signal amplifying circuit; the music signal input terminal is connected with the music signal amplifying circuit; the music signal amplifying circuit comprises a first operation amplifier; the music signal input terminal is connected with the inverting input terminal of the first operation amplifier; and a first resistor is connected between the inverting input terminal of the first operation amplifier and the first operation amplifier. The power amplifier further comprises a voice signal sampling circuit, a diode and a triode, wherein one end of the voice signal sampling circuit is connected with the output terminal of the voice signal amplifying circuit; the other end of the voice signal sampling circuit is connected with the input terminal of the diode; the output terminal of the diode is connected with the base electrode of the triode; and the collecting electrode and the emitting electrode of the triode are respectively connected to two ends of the first resistor. The power amplifier is provided with an automatic mute priority circuit.
Description
Technical field
The utility model relates to a kind of power amplifier with automatic mute priority function.
Background technology
Power amplifier full name power amplifier is commonly called as sound amplifier, is equipment the most basic in the sound system, and its task is to amplify the ultra-weak electronic signal from signal source to drive loud speaker to sound.Present power amplifier does not have the automatic mute priority function;, talker's sound and music can play back together when importing together; People are difficult to catch the content that the spokesman speaks like this, because the content of speaking mixes with music signal fully, distinguish comes.
The utility model content
The technical problem that the utility model will solve is that a kind of power amplifier with automatic mute priority function that has the automatic mute priority circuit is provided.
The technical solution of the utility model is, a kind of power amplifier with automatic mute priority function with following structure is provided, and comprises people's acoustic signal input end, voice signal amplification circuit, music signal input and music signal amplifying circuit; Described people's acoustic signal input end is connected with the voice signal amplification circuit; Described music signal input is connected with the music signal amplifying circuit; Described music signal amplifying circuit comprises first operational amplifier; Described music signal input is connected the inverting input of first operational amplifier; Be connected with first resistance between the inverting input of described first operational amplifier and first operational amplifier, also comprise voice signal sample circuit, diode and triode; One end of described voice signal sample circuit is connected with the output of voice signal amplification circuit; The other end of described voice signal sample circuit is connected with the input of described diode; The output of described diode is connected with the base stage of described triode, and the collector and emitter of described triode is connected to the two ends of described first resistance.
After adopting above structure, the power amplifier with automatic mute priority function of the utility model compared with prior art has the following advantages:
Because the power amplifier with automatic mute priority function of the utility model also comprises voice signal sample circuit, diode and triode; People's acoustical signal that the voice signal sample circuit is used to gather the spokesman when speaking, diode is used for the signal of sampling is carried out becoming the Kai Heguan that direct voltage is controlled triode after the rectification; When the spokesman spoke, Acquisition Circuit can acquired signal, behind diode rectification to trigger voltage of base stage of triode; Triode is switched on, because the collector and emitter of triode is connected to the two ends of first resistance, therefore; First resistance is by short circuit, and at this moment, the multiplication factor of music signal amplifying circuit is zero; Music signal no-output, power amplifier are only exported spokesman's sound, therefore; People can only hear spokesman's sound in loud speaker or broadcasting, thereby can play the preferential function of automatic mute.
Described voice signal sample circuit comprises sampling resistor and sampled signal amplifying circuit; One end of described sampling resistor is connected with the output of voice signal amplification circuit; The other end of described sampling resistor is connected with the input of sampled signal amplifying circuit, and the output of described sampled signal amplifying circuit is connected with the input of described diode.
Description of drawings
Fig. 1 is the circuit theory diagrams of the power amplifier with automatic mute priority function of the utility model.
Shown in the figure: 1, people's acoustic signal input end, 2, the voice signal amplification circuit, 3, the music signal input, 4, the music signal amplifying circuit, 5, the voice signal sample circuit, 5.1, the sampled signal amplifying circuit.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is described further.
See also shown in Figure 1ly, the power amplifier with automatic mute priority function of the utility model comprises people's acoustic signal input end 1, voice signal amplification circuit 2, music signal input 3 and music signal amplifying circuit 4.Described people's acoustic signal input end 1 is connected with voice signal amplification circuit 2.Described music signal input 3 is connected with music signal amplifying circuit 4.Described music signal amplifying circuit 4 comprises the first operational amplifier U4; Described music signal input 3 is connected the inverting input of the first operational amplifier U4, is connected with first resistance R 49 between the inverting input of the described first operational amplifier U4 and the first operational amplifier U4.The model of the described first operational amplifier U4 is 4580.
The power amplifier with automatic mute priority function of the utility model also comprises voice signal sample circuit 5, diode D5 and triode Q2.One end of described voice signal sample circuit 5 is connected with the output of voice signal amplification circuit 2; The other end of described voice signal sample circuit 5 is connected with the input of described diode D5; The output of described diode D5 is connected with the base stage of described triode Q2, and the collector and emitter of described triode Q2 is connected to the two ends of described first resistance R 49.Described voice signal sample circuit 5 comprises sampling resistor R40 and sampled signal amplifying circuit 5.1; The end of described sampling resistor R40 is connected with the output of voice signal amplification circuit 2; The other end of described sampling resistor R40 is connected with the input of sampled signal amplifying circuit 5.1, and the output of described sampled signal amplifying circuit 5.1 is connected with the input of described diode D5.
The model of the operational amplifier in the described voice signal amplification circuit is 4580, and the voice signal amplification circuit is conventional amplifying circuit, repeats no more at this.The model of described sampled signal amplifying circuit is 2068, and the sampled signal amplifying circuit is conventional amplifying circuit, repeats no more at this.
Claims (2)
1. the power amplifier with automatic mute priority function comprises people's acoustic signal input end (1), voice signal amplification circuit (2), music signal input (3) and music signal amplifying circuit (4); Described people's acoustic signal input end (1) is connected with voice signal amplification circuit (2); Described music signal input (3) is connected with music signal amplifying circuit (4); Described music signal amplifying circuit (4) comprises first operational amplifier (U4); Described music signal input (3) is connected the inverting input of first operational amplifier (U4); Be connected with first resistance (R49) between the inverting input of described first operational amplifier (U4) and first operational amplifier (U4), it is characterized in that: also comprise voice signal sample circuit (5), diode (D5) and triode (Q2); One end of described voice signal sample circuit (5) is connected with the output of voice signal amplification circuit (2); The other end of described voice signal sample circuit (5) is connected with the input of described diode (D5); The output of described diode (D5) is connected with the base stage of described triode (Q2), and the collector and emitter of described triode (Q2) is connected to the two ends of described first resistance (R49).
2. the power amplifier with automatic mute priority function according to claim 1; It is characterized in that: described voice signal sample circuit (5) comprises sampling resistor (R40) and sampled signal amplifying circuit (5.1); One end of described sampling resistor (R40) is connected with the output of voice signal amplification circuit (2); The other end of described sampling resistor (R40) is connected with the input of sampled signal amplifying circuit (5.1), and the output of described sampled signal amplifying circuit (5.1) is connected with the input of described diode (D5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204902425U CN202353794U (en) | 2011-12-01 | 2011-12-01 | Power amplifier with automatic mute priority function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204902425U CN202353794U (en) | 2011-12-01 | 2011-12-01 | Power amplifier with automatic mute priority function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202353794U true CN202353794U (en) | 2012-07-25 |
Family
ID=46542748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204902425U Expired - Fee Related CN202353794U (en) | 2011-12-01 | 2011-12-01 | Power amplifier with automatic mute priority function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202353794U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110677778A (en) * | 2019-10-10 | 2020-01-10 | 深圳市九洲电器有限公司 | Audio mute control circuit and electronic equipment |
-
2011
- 2011-12-01 CN CN2011204902425U patent/CN202353794U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110677778A (en) * | 2019-10-10 | 2020-01-10 | 深圳市九洲电器有限公司 | Audio mute control circuit and electronic equipment |
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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: 20120725 Termination date: 20121201 |