CN202488584U - Mute circuit and set top box having same - Google Patents
Mute circuit and set top box having same Download PDFInfo
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- CN202488584U CN202488584U CN201220094376XU CN201220094376U CN202488584U CN 202488584 U CN202488584 U CN 202488584U CN 201220094376X U CN201220094376X U CN 201220094376XU CN 201220094376 U CN201220094376 U CN 201220094376U CN 202488584 U CN202488584 U CN 202488584U
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Abstract
The utility model discloses a mute circuit and a set top box having the mute circuit. The mute circuit comprises an audio output terminal, wherein the audio output terminal is connected with a current input end of a first controllable switch circuit through a first resistor; the control end of the first controllable switch circuit is connected with a shutdown mute control circuit sub-unit through a second resistor; the shutdown mute control circuit sub-unit comprises a second controllable switch circuit and a third controllable switch circuit; the control end of the second controllable switch circuit is connected with a first power supply trough a resistance potential-divider network; the current input end of the second controllable switch circuit is connected with a second power supply through a third resistor on one hand and connected with the current input end of the third controllable switch circuit through a fourth resistor on the other hand; the current output end of the third controllable switch circuit is connected with the second resistor; and the power failure of the first power supply is earlier than the power failure of the second power supply. The mute circuit of the embodiment is strong in generality, simple in structure and low in cost, and can be widely used in various set top boxes.
Description
Technical field
The utility model relates to electric and electronic technical field, specifically, relates to a kind of mute circuit and has the STB of this circuit.
Background technology
Along with the development of top box of digital machine, increasing decoding chip is applied in its conceptual design.The same with television set, top box of digital machine can produce sonic boom in the switching on and shutting down process, has reduced the comfortableness that the user uses STB.
For solving the sonic boom problem in the switching on and shutting down process, prior art is provided with mute circuit mostly, makes in set-top-box opening or shutdown process, to close audio frequency output.But mute circuit of the prior art generally is directed against concrete decoding chip and hardware platform and designs, and causes the circuit versatility poor; And existing mute circuit structure is lengthy and jumbled, occupies bigger mainboard area, and not only cost is higher, and the effect of elimination sonic boom is not ideal enough.
Summary of the invention
The purpose of the utility model is to provide a kind of mute circuit, uses that this circuit can solve effectively that the versatility that mute circuit of the prior art exists is poor, problems such as complex structure, big, the cost height of taking up space.
For solving the problems of the technologies described above, the utility model adopts following technical scheme to be achieved:
A kind of mute circuit; Comprise audio output; Audio output connects the current input terminal of the first gate-controlled switch circuit through first resistance; The current output terminal ground connection of the first gate-controlled switch circuit, the first gate-controlled switch circuit control end is connected with shutdown muting control circuit subelement through second resistance; Shutdown muting control circuit subelement comprises the second gate-controlled switch circuit and the 3rd gate-controlled switch circuit; The second gate-controlled switch circuit control end connects first power supply through resistance pressure-dividing network; The current input terminal of the second gate-controlled switch circuit connects second source through the 3rd resistance on the one hand; The current input terminal that connects the 3rd gate-controlled switch circuit on the other hand through the 4th resistance; The current output terminal of the 3rd gate-controlled switch circuit connects second resistance; And then be connected with the first gate-controlled switch circuit control end through second resistance, the second gate-controlled switch circuital current output and the 3rd gate-controlled switch circuit control end ground connection, and first power supply power-fail is early than second source.
Aforesaid mute circuit; For simplifying circuit structure; Said resistance pressure-dividing network includes the 5th resistance and the 6th resistance of series connection; The said second gate-controlled switch circuit control end is connected on the connecting line between the 5th resistance and the 6th resistance, and the other end of the 5th resistance connects said first power supply, the other end ground connection of the 6th resistance.
Aforesaid mute circuit; Complete quiet output during for the assurance shutdown; The said second gate-controlled switch circuit comprises a NPN type triode, and base stage, the collector and emitter of NPN type triode is respectively the second gate-controlled switch circuit control end, current input terminal and current output terminal; Said the 3rd gate-controlled switch circuit comprises a positive-negative-positive triode, and the base stage of positive-negative-positive triode, emitter and collector are respectively the 3rd gate-controlled switch circuit control end, current input terminal and current output terminal.
Aforesaid mute circuit, the audio mute output during for the realization start, the said first gate-controlled switch circuit control end also is connected with the turn-on muting control circuit subelement through said second resistance; The turn-on muting control circuit subelement includes the 4th gate-controlled switch circuit; The current output terminal of the 4th gate-controlled switch circuit connects second resistance; And then warp second resistance is connected with the first gate-controlled switch circuit control end; The current input terminal of the 4th gate-controlled switch circuit connects the 3rd power supply through the 7th resistance on the one hand, connects Selective Control terminal, the 4th gate-controlled switch circuit control end ground connection through the 8th resistance on the other hand.
Aforesaid mute circuit, the complete quiet output during for the realization start, said the 3rd power supply is the fastest power supply that powers in the mute circuit Circuits System of living in.
Aforesaid mute circuit, said the 4th gate-controlled switch circuit comprises a positive-negative-positive triode, the base stage of positive-negative-positive triode, emitter and collector are respectively the 3rd gate-controlled switch circuit control end, current input terminal and current output terminal.
Aforesaid mute circuit, for preventing the safety to other circuit and chip in the mute circuit Circuits System of living in, the resistance span of said the 7th resistance is 10-20 k Ω.
Aforesaid mute circuit, for further guaranteeing complete quiet output, the resistance span of said first resistance and said second resistance is 1-4.7k Ω.
The utility model also provides a kind of STB; This STB comprises mainboard and is arranged on the audio decoding circuit on the mainboard; On mainboard, also be provided with mute circuit; Said mute circuit adopts above-mentioned described circuit structure, and in mute circuit, audio output that said audio output is an audio decoding circuit.
Compared with prior art; The advantage and the good effect of the utility model are: the utility model utilizes the corresponding resistance of gate-controlled switch circuit arrangement to constitute mute circuit; Not only circuit structure is simple, and it is less to occupy board area, is beneficial to the composing design of circuit board; And shortened research and development and generation cycle, reduced circuit cost; In addition, whole mute circuit does not rely on specific audio decoder chip and hardware platform, applicable to various system and the products that need mute circuit, and the circuit highly versatile, thus further reduced the complexity of circuit design and exploitation.
After the embodiment in conjunction with advantages the utility model, other characteristics of the utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the structured flowchart of an embodiment of the utility model mute circuit;
Fig. 2 is based on the circuit theory diagrams of a mute circuit embodiment of Fig. 1 structured flowchart.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the utility model is carried out detailed description.
Please refer to the structured flowchart of an embodiment of the utility model mute circuit shown in Figure 1.The mute circuit of this embodiment includes quiet main circuit 11, and quiet main circuit 11 is connected with audio frequency output 14 on the one hand, is connected with shutdown muting control circuit 12 on the other hand.Whether shutdown muting control circuit 12 can be controlled quiet main circuit 11 and work; Specifically: in shutdown, during the Circuits System operate as normal; The quiet main circuit of shutdown muting control circuit 12 control 11 is inoperative; Also be that quiet main circuit 11 can not influence audio frequency output 14, at this moment, the corresponding audio signal of audio frequency output 14 normal outputs; And in shutdown process; The quiet main circuit 11 of shutdown muting control circuit 12 controls works; Also be that quiet main circuit 11 influences audio frequency output 14, make it can not output audio signal, thereby reach the purpose of the interference of quiet in the shutdown process, improper sound such as sonic boom when effectively preventing to shut down.
In addition, the quiet main circuit 11 of this embodiment also is connected with turn-on muting control circuit 13, and whether this control circuit can be controlled quiet main circuit 11 and work in start process.Specifically: in start process, the quiet main circuit 11 of turn-on muting control circuit 13 control works, and also is that quiet main circuit 11 influence audio frequency and exports 14, makes it can not output audio signal, thereby reaches purpose quiet in the start process; And after start, during the Circuits System operate as normal, the quiet main circuit of turn-on muting control circuit 12 controls 11 is inoperative, also is that quiet main circuit 11 can not influence audio frequency output 14, at this moment, and the corresponding audio signal of audio frequency output 14 normal outputs.
The mute circuit of the foregoing description can adopt circuit theory diagrams shown in Figure 2 to realize.
Please refer to Fig. 2, this is shown in Figure 2 to be the circuit theory diagrams based on a mute circuit embodiment of Fig. 1 structured flowchart, is example with mute circuit in Application in Set Top Box below, sets forth the circuit connection structure and the operation principle of mute circuit in detail.
As shown in Figure 2; In the circuit theory diagrams of this embodiment; Include the sub-A_OUT of audio output, when in STB, using, the sub-A_OUT of this audio output is audio output in the audio decoding circuit; This audio output will be connected on the television set through audio output line, and the audio frequency TV signal that audio decoding circuit solves is come out through television for play.The sub-A_OUT of audio output is connected with the quiet main circuit that resistance R 10 is constituted with NPN type triode Q2 and peripheral resistance R 8 thereof.Concrete annexation is: the sub-A_OUT of audio output connects the collector electrode C of triode Q2 through resistance R 10; And the base stage B of triode Q2 is connected with resistance R 8; And then shutdown muting control circuit and the turn-on muting control circuit that below resistance R 8 connections, will describe, the emitter E ground connection of triode Q2.
The quiet output of audio frequency during for the shutdown of realization STB, this embodiment is provided with the shutdown muting control circuit for quiet main circuit.As shown in Figure 2, the shutdown muting control circuit includes a NPN type triode Q1 and a positive-negative-positive triode Q14, and these two triodes cooperate peripheral resistance and two power supply P1 and P2, has constituted the shutdown muting control circuit of two-stage control.Particular circuit configurations is following:
The base stage B of triode Q1 is connected on the connecting line between resistance R 1 and the resistance R 2, resistance R 1 and the resistance R 2 formation resistance pressure-dividing network that is connected in series, and the other end of resistance R 1 connects power supply P1, the other end ground connection of resistance R 2.The emitter E ground connection of triode Q1, and collector electrode C connects the emitter E of triode Q14 on the other hand on the one hand through resistance R 3 connection power supply P2 through resistance R 4.The base stage B of triode Q14 is directly or through resistance R 5 ground connection; And its collector electrode C is connected with resistance R 8 in the quiet main circuit; And then the base stage of the triode Q2 in resistance R 8 and quiet main circuit is connected, thereby realizes being connected of shutdown muting control circuit and quiet main circuit.In the shutdown muting control circuit of said structure, power supply P1 power down will be early than power supply P2, also promptly when shutdown, and the power down of power supply P1 elder generation, power supply P2 power down again after power supply P1 power down.The shutdown muting control circuit is controlled the principle and the process of quiet main circuit can be with reference to follow-up description.
The quiet output of audio frequency during for the realization set-top-box opening, this embodiment also is provided with turn-on muting control circuit for quiet main circuit.As shown in Figure 2, the turn-on muting circuit is made up of a positive-negative-positive triode Q44, Selective Control terminal M_CTRL, power supply P0 and corresponding peripheral resistance, and particular circuit configurations is described below:
The base stage B of triode Q44 is directly or through resistance R 6 ground connection; Its emitter E connects a power supply P0 through resistance R 7 on the one hand; Connect Selective Control terminal M_CTRL through resistance R 9 on the other hand; And its collector electrode C is connected with resistance R 8 in the quiet main circuit, and then the base stage of the triode Q2 in resistance R 8 and quiet main circuit is connected, thereby realizes being connected of turn-on muting control circuit and quiet main circuit.In the turn-on muting control circuit of said structure, the complete quiet output when realizing start, the fastest power supply that powers on the power supply P0 selector top box circuit board for example, can be elected as in the power panel+the 5V power supply.In this embodiment, the effect of Selective Control terminal M_CTRL is to cooperate other circuit structures, and in the set-top-box opening course of normal operation, it is inoperative that the muting control circuit of guaranteeing to shut down can be controlled quiet main circuit, also the i.e. not normal output of interference tones.In this embodiment, Selective Control terminal M_CTRL is preferably an editable universal I/O port of STB master chip.The shutdown muting control circuit is controlled the principle and the process of quiet main circuit can be with reference to follow-up description.
The operation principle and the process of the described mute circuit of Fig. 2 are following:
During the STB operate as normal, for the shutdown muting control circuit, power supply P1 and power supply P2 all power on and are high level.Select resistance R 1 and the resistance of resistance R 2 in the suitable potential-divider network, make that the voltage at base stage B place of triode Q1 is about 0.7V, triode Q1 saturation conduction.Triode Q1 conducting; Make that the transmitter E of triode Q14 is a low level; Triode Q14 ends, and then makes triode Q2 also end, and whole mute circuit is inoperative; Voice data after the set top box decodes will transfer in the television set through the sub-A_OUT of audio output, and come out through television for play.Through the two-stage control of in the shutdown muting control circuit, adopting triode Q1 and triode Q14 to constitute; Simultaneously triode Q14 is connected with triode Q2 in the quiet main circuit; Path in the time of can blocking the STB operate as normal fully between quiet main circuit and power supply P1 and the P2; Make the noise in the power supply wave shape can not be coupled on the sub-A_OUT of audio output, guarantee that television audio signals is interference-free.
And, when the STB operate as normal, Selective Control terminal M_CTRL is exported a low level signal through software arrangements.Under the effect of this low level signal, triode Q44 ends, and guarantees that this moment triode Q2 can conducting yet, and whole mute circuit is inoperative.
During the STB shutdown, because the power down of power supply P1 elder generation causes the base stage B voltage of triode Q1 to descend, when not satisfying turn-on condition, triode Q1 ends.Because power supply P2 power down is slow, drawing on resistance R 3 and the resistance R 4 under the effect, the transmitter E of triode Q14 is a high level, and makes triode Q14 saturation conduction, and then draws high the base stage B voltage of triode Q2, makes also saturation conduction of triode Q2.Behind the triode Q2 saturation conduction, the sub-A_OUT level of audio output is haled to low, thereby closed the output of audio frequency, then the noises such as sonic boom in the shutdown process can not be exported, and have realized the quiet output in the STB shutdown process.
And when STB will be started shooting under off-mode, the STB energized, because power supply P0 elects the fastest power supply that powers on as, after P0 powered on, the master chip of STB was not also started working.At this moment, Selective Control terminal M_CTRL will be in high-impedance state as a universal I/O port of master chip, can think and open circuit.Like this, under the effect of pull-up resistor R7, the transmitter E of triode Q44 is a high level, and triode Q44 saturation conduction makes that the base stage B of triode Q2 is a high level, and triode Q2 is saturation conduction also.Behind the triode Q2 saturation conduction, the sub-A_OUT level of audio output is haled to low, thereby closed the output of audio frequency, then the noises such as sonic boom in the start process can not be exported, and have realized the quiet output in the set-top-box opening process.And after the set-top-box chip operate as normal, again with low level signal of Selective Control terminal M_CTRL configuration.Under the effect of this low level signal, triode Q44 ends, and guarantees that this moment triode Q2 can conducting, and whole mute circuit is inoperative, gets into television audio signals and normally exports broadcast state.
Certainly, the power supply P0 the fastest power supply that also do not power in the selector set-top box system can also be selected other power supplys, as long as can guarantee that this power supply powers on earlier before the work of STB master chip.
Through adopting positive-negative-positive triode Q44 as the gate-controlled switch circuit in the turn-on muting control circuit; Not only realized in the start process control to quiet main circuit; And in the STB course of normal operation; Can block the path between quiet main circuit and the power supply P0 fully, make that the noise in the power supply wave shape can not be coupled on the sub-A_OUT of audio output, guarantee that television audio signals is interference-free.
In this embodiment, in start, shutdown process, be in degree of depth saturation condition, can eliminate on-off noise fully, guarantee complete quiet output, need to select the resistance R 8 and resistance R 10 of suitable resistance in order to ensure triode Q2.In general, the resistance value of these two resistance is advisable between 1-4.7k Ω.
In addition, damage master chip in the master chip for preventing excessive being injected into through Selective Control terminal M_CTRL of electric current, the resistance of resistance R 7 can not be selected too little, and its value is to be advisable between 10-20k Ω.
In the circuit theory diagrams of Fig. 2 embodiment, the shutdown muting control circuit has adopted NPN type triode Q1 and positive-negative-positive triode Q14 as the gate-controlled switch circuit, and turn-on muting control circuit has selected positive-negative-positive triode Q44 as the gate-controlled switch circuit.To those skilled in the art, be not limited to the triode combination of these types and can select for use dissimilar metal-oxide-semiconductors to build circuit, as long as can realize above-mentioned described quiet operation principle and process as the gate-controlled switch circuit.
Above embodiment only in order to the technical scheme of explanation the utility model, but not limits it; Although the utility model has been carried out detailed explanation with reference to previous embodiment, for the person of ordinary skill of the art, still can make amendment to the technical scheme that previous embodiment is put down in writing, perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of relevant art scheme break away from the spirit and the scope of the utility model technical scheme required for protection.
Claims (9)
1. mute circuit; Comprise audio output; It is characterized in that; Audio output connects the current input terminal of the first gate-controlled switch circuit through first resistance, the current output terminal ground connection of the first gate-controlled switch circuit, and the first gate-controlled switch circuit control end is connected with shutdown muting control circuit subelement through second resistance; Shutdown muting control circuit subelement comprises the second gate-controlled switch circuit and the 3rd gate-controlled switch circuit; The second gate-controlled switch circuit control end connects first power supply through resistance pressure-dividing network; The current input terminal of the second gate-controlled switch circuit connects second source through the 3rd resistance on the one hand; The current input terminal that connects the 3rd gate-controlled switch circuit on the other hand through the 4th resistance; The current output terminal of the 3rd gate-controlled switch circuit connects second resistance; And then be connected with the first gate-controlled switch circuit control end through second resistance, the second gate-controlled switch circuital current output and the 3rd gate-controlled switch circuit control end ground connection, and first power supply power-fail is early than second source.
2. mute circuit according to claim 1; It is characterized in that; Said resistance pressure-dividing network includes the 5th resistance and the 6th resistance of series connection; The said second gate-controlled switch circuit control end is connected on the connecting line between the 5th resistance and the 6th resistance, and the other end of the 5th resistance connects said first power supply, the other end ground connection of the 6th resistance.
3. mute circuit according to claim 2; It is characterized in that; The said second gate-controlled switch circuit comprises a NPN type triode, and base stage, the collector and emitter of NPN type triode is respectively the second gate-controlled switch circuit control end, current input terminal and current output terminal; Said the 3rd gate-controlled switch circuit comprises a positive-negative-positive triode, and the base stage of positive-negative-positive triode, emitter and collector are respectively the 3rd gate-controlled switch circuit control end, current input terminal and current output terminal.
4. according to each described mute circuit in the claim 1 to 3, it is characterized in that the said first gate-controlled switch circuit control end also is connected with the turn-on muting control circuit subelement through said second resistance; The turn-on muting control circuit subelement includes the 4th gate-controlled switch circuit; The current output terminal of the 4th gate-controlled switch circuit connects second resistance; And then warp second resistance is connected with the first gate-controlled switch circuit control end; The current input terminal of the 4th gate-controlled switch circuit connects the 3rd power supply through the 7th resistance on the one hand, connects Selective Control terminal, the 4th gate-controlled switch circuit control end ground connection through the 8th resistance on the other hand.
5. mute circuit according to claim 4 is characterized in that, said the 3rd power supply is the fastest power supply that powers in the mute circuit Circuits System of living in.
6. mute circuit according to claim 4; It is characterized in that; Said the 4th gate-controlled switch circuit comprises a positive-negative-positive triode, and the base stage of positive-negative-positive triode, emitter and collector are respectively the 3rd gate-controlled switch circuit control end, current input terminal and current output terminal.
7. mute circuit according to claim 4 is characterized in that, the resistance span of said the 7th resistance is 10-20 k Ω.
8. mute circuit according to claim 1 is characterized in that, the resistance span of said first resistance and said second resistance is 1-4.7k Ω.
9. STB; Comprise mainboard and be arranged on the audio decoding circuit on the mainboard; On mainboard, also be provided with mute circuit, it is characterized in that, said mute circuit is each described mute circuit in the aforesaid right requirement 1 to 8; And in mute circuit, audio output that said audio output is an audio decoding circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220094376XU CN202488584U (en) | 2012-03-14 | 2012-03-14 | Mute circuit and set top box having same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220094376XU CN202488584U (en) | 2012-03-14 | 2012-03-14 | Mute circuit and set top box having same |
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| Publication Number | Publication Date |
|---|---|
| CN202488584U true CN202488584U (en) | 2012-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220094376XU Expired - Fee Related CN202488584U (en) | 2012-03-14 | 2012-03-14 | Mute circuit and set top box having same |
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| Country | Link |
|---|---|
| CN (1) | CN202488584U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107886981A (en) * | 2017-11-28 | 2018-04-06 | 晶晨半导体(上海)股份有限公司 | A kind of power down process method applied to embedded system |
| CN111601217A (en) * | 2020-06-12 | 2020-08-28 | 歌尔科技有限公司 | Noise processing method for audio player, audio player and storage medium |
-
2012
- 2012-03-14 CN CN201220094376XU patent/CN202488584U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107886981A (en) * | 2017-11-28 | 2018-04-06 | 晶晨半导体(上海)股份有限公司 | A kind of power down process method applied to embedded system |
| CN111601217A (en) * | 2020-06-12 | 2020-08-28 | 歌尔科技有限公司 | Noise processing method for audio player, audio player and storage medium |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121010 Termination date: 20190314 |
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| CF01 | Termination of patent right due to non-payment of annual fee |