CN101742379A - Turn-on muting control circuit of sound equipment - Google Patents
Turn-on muting control circuit of sound equipment Download PDFInfo
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- CN101742379A CN101742379A CN200810217613A CN200810217613A CN101742379A CN 101742379 A CN101742379 A CN 101742379A CN 200810217613 A CN200810217613 A CN 200810217613A CN 200810217613 A CN200810217613 A CN 200810217613A CN 101742379 A CN101742379 A CN 101742379A
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- 238000000034 method Methods 0.000 claims abstract description 5
- 238000007493 shaping process Methods 0.000 claims description 18
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- RKCAIXNGYQCCAL-UHFFFAOYSA-N porphin Chemical compound N1C(C=C2N=C(C=C3NC(=C4)C=C3)C=C2)=CC=C1C=C1C=CC4=N1 RKCAIXNGYQCCAL-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Abstract
The invention discloses a turn-on muting control circuit of sound equipment. The circuit comprises an electrifying impulse generating circuit, a switching circuit, and a muting control level supplying circuit, wherein the electrifying impulse generating circuit takes electrifying of a power supply as a triggering condition, and generating a control impulse through a charging process of the circuit; the switching circuit is controlled by a control impulse to turn on or turn off a switching element in the switching circuit; the muting control level supplying circuit supplies a muting control level matched with controlled equipment; the electrifying impulse generating circuit, the switching circuit, and the muting control level supplying circuit are sequentially connected between the power supply and the controlled equipment in series; the control pulse generated when the electrifying impulse generating circuit is electrified is transmitted to the switching circuit; and the switching circuit turns on the switching element in the switching circuit in the presence of the control pulse, so the muting control level supplying circuit outputs the muting control level to the controlled equipment. The turn-on muting control circuit of the sound equipment can effectively keep the controlled equipment in a mute state when the power supply is electrified, and eliminate an abnormal sound during the starting up process.
Description
Technical field
The present invention relates to stereo set, particularly relate to a kind of turn-on muting control circuit of sound equipment.
Background technology
At present we use stereo set power supply electrifying all than comparatively fast, otherwise be easy to generate the sound that powers on, such as the sound that sends " porphin " starting shooting.For addressing this problem, common way is that the quiet pin of power amplifier is put when powering in mute state by quiet control I/O mouth, with the elimination sound that powers on.But some power amplifier has ON, MUTE, three kinds of states of STANDBY, puts when powering in mute state and still can produce sound.Also the long and I/O mouth control of the initialization time of some software is complicated, still abnormal sound can occur when start.
Summary of the invention
The objective of the invention is to overcome above-mentioned problems of the prior art, propose a kind of improved turn-on muting control circuit of sound equipment.
The technical solution used in the present invention is, designs a kind of turn-on muting control circuit of sound equipment, comprising:
The pulse shaping circuit that powers on is a trigger condition with powering on of power supply, and the charging process by circuit forms control impuls;
Switching circuit by control impuls control, makes the switch block conducting in the switching circuit or ends;
Quiet control level provides circuit, and the quiet control level with the controlled device coupling is provided;
The described pulse shaping circuit that powers on, switching circuit, quiet control level provide circuit to be serially connected in proper order between power supply and the controlled device, the control impuls that will form when the pulse shaping circuit that powers on will power on flows to switching circuit, switching circuit makes the switch block conducting in the switching circuit when control impuls exists, thereby makes quiet control level provide circuit to export quiet control level to controlled device.
In one embodiment of the invention, the described pulse shaping circuit that powers on comprises one first triode, and the collector electrode of this first triode connects described switching circuit, and emitter connects power end by a resistance, base stage connects power end by a resistance, passes through a capacity earth between base stage and the resistance.Described switching circuit comprises one second triode, the grounded emitter of this second triode, collector electrode connects described quiet control level circuit is provided, base stage connects the described pulse shaping circuit that powers on by a resistance, base stage and described powering between the pulse shaping circuit respectively by a resistance and a capacity earth.Described quiet control level provides circuit to be made of the series connection of two resistance, and the common port of two resistance is quiet output, the branch beginning of two resistance, a termination power end, the described switching circuit of another termination.
Compare with existing turn-on muting technology, quiet level and time that the present invention discloses circuit all are controlled, the time started of pulse is only relevant with powering on of power supply, it is a kind of circuit of pure hardware, do not get in touch with the I/O mouth of software control, be independent of each other, control simple and reliablely, can eliminate the start sound effectively.
Description of drawings
The present invention will be described in detail below in conjunction with accompanying drawing and preferred embodiment, wherein:
Fig. 1 is the circuit diagram of one embodiment of the invention.
Embodiment
Principle of the present invention is: in a bit of time that sound equipment powers on, apply a quiet level for the quiet control end of sound equipment, make stereo set be in mute state in this time, with the elimination sound that powers on.
As shown in Figure 1, the turn-on muting control circuit of sound equipment that the present invention proposes comprises: the pulse shaping circuit 1 that powers on is a trigger condition with powering on of power Vcc, and the charging process by circuit forms control impuls; Switching circuit 2, the control of controlled pulse makes the switch block conducting in the switching circuit or ends; Quiet control level provides circuit 3, and the quiet control level with the controlled device coupling is provided; The described pulse shaping circuit that powers on, switching circuit, quiet control level provide circuit to be serially connected in proper order between power supply and the controlled device, the control impuls that will form when the pulse shaping circuit that powers on will power on flows to switching circuit, switching circuit makes the switch block conducting in the switching circuit when control impuls exists, thereby makes quiet control level provide circuit to export quiet control level to controlled device.
The described pulse shaping circuit that powers on comprises one first triode V955, the collector electrode of this first triode connects described switching circuit, emitter meets power end Vcc by a resistance, and base stage meets power end Vcc by a resistance, passes through a capacity earth between base stage and the power supply.
Described switching circuit comprises one second triode V952, the grounded emitter of this second triode, collector electrode connects described quiet control level circuit is provided, base stage connects the described pulse shaping circuit that powers on by a resistance, base stage and powering between the pulse shaping circuit respectively by a resistance and a capacity earth.
Described quiet control level provides circuit to be made of the resistance series connection that two resistances are respectively 22 kilohms and 15 kilohms, and the common port of two resistance is the branch beginning of quiet output 4, two resistance, a termination power end Vcc, the described switching circuit of another termination.
During work, the sound equipment start, when power Vcc powered on, the current potential that the base stage VA of first triode is ordered kept a period of time low level, keeps the low level time to depend on R955, the time constant of C975; At this moment, the collector electrode VB point output high level of first triode, thereby make quiet output 4 VC point output low level just, and low level height depends on R959, the partial pressure value of R960, this output low level removes to control the MUTE terminal of power amplifier, makes power amplifier be in mute state, thereby reaches the effect of eliminating start " porphin " sound.
After the sound equipment start finishes, the power Vcc stable power-supplying, the current potential that the base stage VA of first triode is ordered keeps high level, after this, the collector electrode VB point output low level of first triode, thereby make quiet output 4 VC point output just high level, this output high level removes to control the MUTE terminal of power amplifier, makes power amplifier break away from mute state.
Claims (5)
1. turn-on muting control circuit of sound equipment is characterized in that comprising:
The pulse shaping circuit that powers on is a trigger condition with powering on of power supply, and the charging process by circuit forms control impuls;
Switching circuit by control impuls control, makes the switch block conducting in the switching circuit or ends;
Quiet control level provides circuit, and the quiet control level with the controlled device coupling is provided;
The described pulse shaping circuit that powers on, switching circuit, quiet control level provide circuit to be serially connected in proper order between power supply and the controlled device, the control impuls that will form when the pulse shaping circuit that powers on will power on flows to switching circuit, switching circuit makes the switch block conducting in the switching circuit when control impuls exists, thereby makes quiet control level provide circuit to export quiet control level to controlled device.
2. turn-on muting control circuit of sound equipment according to claim 1, it is characterized in that: the described pulse shaping circuit that powers on comprises one first triode, the collector electrode of this first triode connects described switching circuit, emitter connects power end by a resistance, base stage connects power end by a resistance, passes through a capacity earth between base stage and the resistance.
3. turn-on muting control circuit of sound equipment according to claim 1, it is characterized in that: described switching circuit comprises one second triode, the grounded emitter of this second triode, collector electrode connects described quiet control level circuit is provided, base stage connects the described pulse shaping circuit that powers on by a resistance, base stage and described powering between the pulse shaping circuit respectively by a resistance and a capacity earth.
4. turn-on muting control circuit of sound equipment according to claim 1, it is characterized in that: described quiet control level provides circuit to be made of the series connection of two resistance, and the common port of two resistance is quiet output, the branch beginning of two resistance, one termination power end, the described switching circuit of another termination.
5. turn-on muting control circuit of sound equipment according to claim 1 is characterized in that: described controlled device is the television audio power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810217613A CN101742379A (en) | 2008-11-21 | 2008-11-21 | Turn-on muting control circuit of sound equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810217613A CN101742379A (en) | 2008-11-21 | 2008-11-21 | Turn-on muting control circuit of sound equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101742379A true CN101742379A (en) | 2010-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810217613A Pending CN101742379A (en) | 2008-11-21 | 2008-11-21 | Turn-on muting control circuit of sound equipment |
Country Status (1)
| Country | Link |
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| CN (1) | CN101742379A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102480664A (en) * | 2010-11-30 | 2012-05-30 | 现代自动车株式会社 | Apparatus and method of controlling driving of popup tweeter speaker |
| CN102480664B (en) * | 2010-11-30 | 2016-12-14 | 现代自动车株式会社 | Control the apparatus and method of the driving of Pop-up high pitch loudspeaker |
-
2008
- 2008-11-21 CN CN200810217613A patent/CN101742379A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102480664A (en) * | 2010-11-30 | 2012-05-30 | 现代自动车株式会社 | Apparatus and method of controlling driving of popup tweeter speaker |
| CN102480664B (en) * | 2010-11-30 | 2016-12-14 | 现代自动车株式会社 | Control the apparatus and method of the driving of Pop-up high pitch loudspeaker |
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| AD01 | Patent right deemed abandoned |
Effective date of abandoning: 20100616 |
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| C20 | Patent right or utility model deemed to be abandoned or is abandoned |