CN201328180Y - Silencing device capable of eliminating popcorn noise - Google Patents
Silencing device capable of eliminating popcorn noise Download PDFInfo
- Publication number
- CN201328180Y CN201328180Y CNU2008201770418U CN200820177041U CN201328180Y CN 201328180 Y CN201328180 Y CN 201328180Y CN U2008201770418 U CNU2008201770418 U CN U2008201770418U CN 200820177041 U CN200820177041 U CN 200820177041U CN 201328180 Y CN201328180 Y CN 201328180Y
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- electric crystal
- switch
- silencing apparatus
- control circuit
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Abstract
The utility model relates to a silencing device capable of eliminating popcorn noise, which is characterized by comprising a switch control circuit, a switch and a mute start circuit, wherein the switch is connected between the switch control circuit and the mute start circuit, the switch control circuit is connected with a work power supply, and generates first voltage and second voltage, and the switch control circuit controls the opening and the closing of the switch according to the voltage difference between the first voltage and the second voltage, the mute start circuit comprises a pair of sound channel ends, when the switch is opened, the mute start circuit is started, and each sound channel end is led to directly and electrically connect ground to stop outputting any sound source signals, and therefore, an image and sound sonic device is to enter a mute state instantly when a power supply is connected or disconnected for avoiding the problem of popcorn noise.
Description
Technical field
The utility model is relevant for a kind of silencing apparatus of eliminating sonic boom, and audio-visual stereo set will enter mute state in the moment of mains switch machine, to avoid producing the problem of sonic boom.
Background technology
General audio-visual stereo set often has the problem of the moment generation sonic boom of mains switch machine, its main cause is the moment of switching on and shutting down, the working power of power supply can produce the jumbo variation of voltage quasi position, and the source of sound signal that makes source of sound numerical digit analogy converter (Audio DAC) in the audio-visual stereo set and operational amplifier (OP AMP) be exported is interfered easily and produces extra noise, cause and cause the moment sonic boom, and bring the puzzlement in user's use.
Moreover, in order to solve the problem of moment sonic boom, add a turn-on muting circuit in the audio-visual stereo set of being everlasting, so that before the noise generation, the moment sonic boom that the start mute circuit can be suppressed to start shooting.Yet, the processing that this turn-on muting circuit only suppresses for the moment sonic boom of starting shooting, and the moment sonic boom of shutdown does not carry out any disposal, therefore the moment of shutdown still can produce the situation of sonic boom.
Summary of the invention
Main purpose of the present utility model is to provide a kind of silencing apparatus of eliminating sonic boom, to have power supply start quiet and power supply quiet function of shutdown moment of moment, effectively thoroughly solve the sonic boom problem that moment produced of audio-visual stereo set at the mains switch machine with this.
Secondary objective of the present utility model is to provide a kind of silencing apparatus of eliminating sonic boom, and the user uses a teleswitch and controls audio-visual stereo set and enter remote circuit shutdown, the effect of the reached elimination sonic boom that silencing apparatus is same.
The purpose of this utility model is achieved by following technical proposals:
A kind of silencing apparatus of eliminating sonic boom is characterized in that: comprise
ON-OFF control circuit connects working power, and generation has first voltage and second voltage;
Derailing switch connects described ON-OFF control circuit, and the voltage difference between this first voltage and this second voltage will be controlled the switch of this derailing switch;
Silent start circuit connects described derailing switch, and includes a pair of sound channel end, when this derailing switch is opened, starts this silent start circuit, makes the directly electrical ground connection of each sound channel end.
Described ON-OFF control circuit comprises:
First diode, its positive terminal connects this working power, and negative pole end is connected with first capacitor of ground connection and produces described first voltage;
First resistor, wherein an end is connected with the negative pole end and first capacitor of this first diode;
Second resistor, wherein an end connects the other end of this first resistor and produces described second voltage, and the other end is connected with second capacitor of ground connection;
Second diode, its positive terminal connect the other end of this second capacitor and this second resistor, and negative pole end connects the positive terminal of this working power and this first diode.
Described derailing switch includes first end, second end and the 3rd end; Described first end and second end connect this ON-OFF control circuit to receive described first voltage and second voltage respectively; When the voltage difference between this first voltage and this second voltage surpassed the critical voltage of this derailing switch, then this derailing switch was opened, and the 3rd end connects this silent start circuit and generation has driving voltage, and started this silent start circuit with this driving voltage.
Described derailing switch is PNP electric crystal or PMOS electric crystal.
Described silent start circuit comprises:
First electric crystal, its first end is the L channel end, second end connects described derailing switch by the 3rd resistor, and the 3rd end ground connection;
Second electric crystal, its first end is the R channel end, second end connects described derailing switch by the 4th resistor, and the 3rd end ground connection, and this R channel end and this L channel end will be formed this to the sound channel end.
Described first electric crystal and second electric crystal are respectively NPN electric crystal or NMOS electric crystal.
Described silencing apparatus includes the power supply of remote controller switching circuit; This power supply of remote controller switching circuit connects described ON-OFF control circuit, this power supply of remote controller switching circuit is in order to receiving the remote controller controlling signal, and according to this remote controller controlling signal remote-controlled power switch machine and change this second voltage that this ON-OFF control circuit produces.
Described remote controller control circuit includes the 3rd electric crystal; First end of the 3rd electric crystal connects this switch control device circuit, and second end receives this power supply of remote controller switch controlling signal by the 5th resistor, and the 3rd end ground connection.
Described the 3rd electric crystal is NPN electric crystal or NMOS electric crystal.
When described remote controller controlling signal is the high levle state, start the 3rd electric crystal, this second voltage that this ON-OFF control circuit is produced will draw reduces to zero potential.
The beneficial effects of the utility model are: this silencing apparatus that can eliminate sonic boom can make audio-visual stereo set will enter mute state in the moment of mains switch machine, to avoid producing the problem of sonic boom.
Description of drawings
Fig. 1 is the electrical block diagram that can eliminate the silencing apparatus preferred embodiment of sonic boom;
Fig. 2 is the circuit diagram of silencing apparatus when power supply is started shooting;
Fig. 3 is the circuit diagram of silencing apparatus when power supply shuts down;
Fig. 4 silencing apparatus uses a teleswitch and carries out the power supply circuit diagram in when shutdown.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Fig. 1 is the electrical block diagram that can eliminate the silencing apparatus preferred embodiment of sonic boom.As shown in the figure, silencing apparatus 100 of the present utility model includes an ON-OFF control circuit 10, a derailing switch 30 and a silent start circuit 50, and silencing apparatus 100 will be applied on the mains switch machine of audio-visual stereo set or computer equipment.
ON-OFF control circuit 10 connects working power, this working power is a direct voltage source, for example: and DC 12V, and be powered at audio-visual stereo set and inner silencing apparatus 100 thereof, ON-OFF control circuit 10 has the first voltage V1 and the second voltage V2 according to the power supply state of working power with the correspondence generation.
Derailing switch 30 connects ON-OFF control circuit 10, receiving the first voltage V1 and the second voltage V2, ON-OFF control circuit 10 according to the voltage difference between the first voltage V1 and the second voltage V2 with the unlatching of control switch device 30 or close.
ON-OFF control circuit 10 primary structures include first diode 11, first capacitor 12, first resistor 13, second resistor 14, second capacitor 15 and second diode 16.The positive terminal of first diode 11 connects working power, and negative pole end is connected with first capacitor 12 of a ground connection and produces the first voltage V1.A wherein end of first resistor 13 is connected with the negative pole end 11 and first capacitor 12 of first diode, the other end is connected with second resistor 14 and produces on tie point the second voltage V2, moreover the other end of second resistor 14 will be connected with second capacitor 15 of a ground connection.And the positive terminal of second diode 16 connects the other end of second capacitor 15 and second resistor 14, and negative pole end connects the positive terminal of the working power and first diode 11.
Derailing switch 30 is PNP electric crystal or PMOS electric crystal, and its primary structure includes first end, second end and the 3rd end, for example: emitter-base bandgap grading, base stage and the collection utmost point.First end of derailing switch 30 and second end connect ON-OFF control circuit 10 receiving the first voltage V1 and the second voltage V2 respectively, and the 3rd end connects silent start circuit 50.
Voltage difference between the first voltage V1 and the second voltage V2 surpass electric crystal derailing switch 30 critical voltage (for example: in the time of 0.7), then derailing switch 30 is opened, and produce the driving voltage Vm that a high potential is arranged, and start silent start circuit 50 with driving voltage Vm at the 3rd end.
And silent start circuit 50 primary structures include first electric crystal 51 and second electric crystal 55.First electric crystal 51 and second electric crystal 55 are respectively NPN electric crystal or NMOS electric crystal.First end of first electric crystal 51 is that L channel end 511, the second ends connect derailing switch 30 by the 3rd resistor 53, and the 3rd end ground connection.First end of second electric crystal 55 is that R channel end 551, the second ends connect derailing switch 30 by the 4th resistor 57, and the 3rd end ground connection, and this R channel end 511 will consist of a pair of sound channel end with this L channel end 551.
Fig. 2 is the circuit diagram of silencing apparatus when power supply is started shooting.As shown in the figure, in power supply when start,, working power moment (for example: 0v → 12v), 11 conductings of first diode is pulled up to high potential, the 16 not conductings of second diode, and the action of charging for first capacitor 12 and second capacitor 15 of ON-OFF control circuit 10.
Be not provided with any resistor among the charging current path I1 of first capacitor 12, and be provided with first resistor 13 and second resistor 14 among the charging current path I2 of second capacitor 15, therefore, the charging rate of first capacitor 12 will be faster than second capacitor 15, and then the speed that the current potential of the first voltage V1 rises will be faster than the second voltage V2.
When the current potential of the first voltage V1 draws high fast, and when making the voltage difference of winning between the voltage V1 and the second voltage V2 surpass the critical voltage of derailing switch 30, for example: V1-V2＞0.7v, derailing switch 30 will be opened, and the 3rd end of derailing switch 30 will produce the driving voltage Vm of a high potential, and it is about V1-0.2v (VCE potential difference).
The driving voltage Vm of high potential can be greater than first electric crystal 51 of silent start circuit 50 and the critical voltage (0.7v) of second electric crystal 55, to drive conducting first electric crystal 51 and second electric crystal 55, and audio-visual stereo set will enter the running of mute state, the end-point voltage of the R channel end 551 of the L channel end 511 of first electric crystal 51 and second electric crystal 55 can be forced to draw and reduce to zero potential, can't export any source of sound signal with source of sound treatment circuit and/or loudspeaker that this L channel end 511 and R channel end 551 are connected, and reach quiet effect.
12 chargings of first capacitor are saturated, and second capacitor 15 continues charging, voltage difference between the first voltage V1 and the second voltage V2 will be dwindled gradually, and the voltage difference between the first voltage V1 and the second voltage V2 is during less than the critical voltage of derailing switch 30, for example: V1-V2＜0.7v, derailing switch 30 cuts out, and the 3rd end of derailing switch 30 produces the driving voltage Vm of an electronegative potential, and it is about 0v.
The driving voltage Vm of electronegative potential can't drive first electric crystal 51 and second electric crystal 55, and audio-visual stereo set will enter the running of normal condition, the end-point voltage of the R channel end 551 of the L channel end 511 of first electric crystal 51 and second electric crystal 55 can revert to operating potential originally, and source of sound treatment circuit and/or the exportable source of sound signal of loudspeaker.
Over time, first capacitor 12 and second capacitor 15 all charge saturated after, silencing apparatus 100 will enter stable state, and the first voltage V1 approaches the second voltage V2, and make derailing switch 30 continue to close, audio-visual stereo set is still kept normal running, and can carry out the output of source of sound signal.
Fig. 3 is the circuit diagram of silencing apparatus when power supply shuts down.As shown in the figure, when power supply shut down, working power moment was reduced to zero potential (0v), the 11 not conductings of first diode, 16 conductings of second diode, and the action of discharging for first capacitor 12 and second capacitor 15 of ON-OFF control circuit 10.
Be not provided with any resistor among the discharge current path I3 of second capacitor 15, and be provided with first resistor 13 and second resistor 14 among the discharge current path I4 of first capacitor 11.Therefore, the velocity of discharge of second capacitor 15 will be faster than first capacitor 11, and then the speed that the current potential of the second voltage V2 descends will be faster than the first voltage V1.
Fall when the current potential of the second voltage V2 draws fast, and when making the voltage difference of winning between the voltage V1 and the second voltage V2 surpass the critical voltage of derailing switch 30, derailing switch 30 will be opened, and the 3rd end of derailing switch 30 produces the driving voltage Vm of a high potential.
In like manner, the driving voltage Vm of high potential can be greater than first electric crystal 51 of silent start circuit 50 and the critical voltage of second electric crystal 55, and with driving conducting first electric crystal 51 and second electric crystal 55, and audio-visual stereo set will enter the running of mute state.The end-point voltage of the R channel end 551 of the L channel end 511 of first electric crystal 51 and second electric crystal 55 can be forced to draw and reduce to zero potential, so that source of sound treatment circuit that L channel end 511 and R channel end 551 are connected and/or loudspeaker can't be exported any source of sound signal, and reach quiet effect.
15 discharges of second capacitor finish, and 12 continuous discharges of first capacitor, voltage difference between the first voltage V1 and the second voltage V2 will be dwindled gradually, and the voltage difference between the first voltage V 1 and the second voltage V2 is during less than the critical voltage of derailing switch 30, for example: V1-V2＜0.7v, derailing switch 30 will cut out, and the 3rd end of derailing switch 30 will produce the driving voltage Vm of an electronegative potential.The driving voltage Vm of electronegative potential can't drive first electric crystal 51 and second electric crystal 55, and audio-visual stereo set will enter off-mode, to stop all runnings.
Over time, first capacitor 12 and second capacitor 15 all discharge finish after, the first voltage V1 and the second voltage V2 are all zero potential (0v), and make derailing switch 30 continue to close, audio-visual stereo set will shut down fully.
In sum, in the moment of mains switch machine, silencing apparatus 100 discharges and recharges the difference of speed by first capacitor 11 and second capacitor 15 and causes voltage difference between the first voltage V1 and the second voltage V2, and therefore start quiet function immediately, effectively thoroughly to solve audio-visual stereo set or computer equipment the sonic boom problem that moment was produced at the mains switch machine.
Circuit diagram when Fig. 4 carries out the power supply shutdown for silencing apparatus uses a teleswitch.As shown in the figure, silencing apparatus 100 also includes power supply of remote controller switching circuit 70, this power supply of remote controller switching circuit 70 connects ON-OFF control circuit 10, in order to receiving the infrared remote controller controlling signal that remote controller sent, and carry out the action of remote-controlled power switch machine and change this second voltage V2 that ON-OFF control circuit 10 is produced according to the remote controller controlling signal.
Power supply of remote controller switching circuit 70 primary structures include the 3rd crystal 71, the three crystal 71 and can be NPN electric crystal or NMOS electric crystal.First end of the 3rd electric crystal 71 is connected in the tie point of positive terminal of second resistor 14, second capacitor 15 and second diode 16 of ON-OFF control circuit 10 altogether, and second end receives the remote controller controlling signal by the 5th resistor 73, and the 3rd end ground connection.
Receive the remote controller controlling signal of a low level state (Low) at power supply of remote controller switching circuit 70, audio-visual stereo set carries out the remote circuit start, and receiving the remote controller controlling signal of a high levle state (High), audio-visual stereo set carries out the remote circuit shutdown.
Moreover, carry out the power supply shutdown by controlling of remote controller, can't really enter the state of the total shutdown of power supply, working power still can be kept basic power supply, that is to say, uses and shakes the switching that the shutdown of control power supply can be considered standby mode.Audio-visual stereo set like this will be in holding state, and exhausted most circuit only keeps temporary close in order to receive the running of remote controller controlling signal interlock circuit, to reduce the consumption of circuit power.
As shown in Figure 2, after the power supply start, silencing apparatus 100 can progress into stable state, change the state of High into by Low when the power supply of remote controller switching circuit 70 remote controller controlling signal that receives, to indicate silencing apparatus 100 to enter remote circuit shutdown, the 3rd electric crystal 71 conductings of power supply of remote controller switching circuit 70 make directly electrical ground connection and having put fast of second capacitor 15, for example: discharge current path I5, and the second voltage V2 will draw and reduce to zero potential (0v).
(for example: DC 12v), it is saturated that first capacitor 12 will maintain charging, and the first voltage V1 is same as the magnitude of voltage (12v) of working power, 11 conductings of first diode, the 16 not conductings of second diode because working power still can be kept basic power supply.
Therefore, voltage difference between the first voltage V1 and the second voltage V2 will far surpass in the critical voltage of derailing switch 30, and with actuating switch device 30, and then start silent start circuit 50, and make audio-visual stereo set enter the running of mute state, stop to export any source of sound signal.
Otherwise, change the state of Low into by High when the power supply of remote controller switching circuit 70 remote controller controlling signal that receives, to indicate silencing apparatus 100 to enter the remote circuit start, the 3rd electric crystal 71 not conductings of power supply of remote controller switching circuit 70, slowly charging of second capacitor, 15 beginnings.
Between the charge period of second capacitor 15, the voltage difference that the first voltage V 1 and the second voltage V are 2 still can surpass in the critical voltage of derailing switch 30, therefore, derailing switch 30 and silent start circuit 50 still remain on the state of startup, and audio-visual stereo set maintains the running of mute state.
After second capacitor 15 is full of electricity, silencing apparatus 100 operates in stable state, the magnitude of voltage of the second voltage V2 will approach the first voltage V 1, and make derailing switch 30 and silent start circuit 50 close, and audio-visual stereo set will enter the running of normal condition, the end-point voltage of L channel end 511 and R channel end 551 reverts to operating potential originally, and the source of sound treatment circuit of audio-visual stereo set and/or the exportable source of sound signal of loudspeaker.
Therefore, the user uses a teleswitch and controls the standby mode that audio-visual stereo set enters the remote circuit shutdown, the effect of the reached elimination sonic boom that silencing apparatus 100 is same, when avoiding audio-visual stereo set standby because external factor (for example: surging power supply, electromagnetic interference etc.) is still sent sonic boom.
The above; it only is preferred embodiment of the present utility model; be not to be used for limiting practical range of the present utility model; be that all equalizations of doing according to the described shape of the utility model claim, structure, feature and spirit change, all should be included within the protection range of the present utility model.
Claims (10)
1. the silencing apparatus that can eliminate sonic boom is characterized in that: comprise
ON-OFF control circuit connects working power, and generation has first voltage and second voltage;
Derailing switch connects described ON-OFF control circuit, and the voltage difference between this first voltage and this second voltage will be controlled the switch of this derailing switch;
Silent start circuit connects described derailing switch, and includes a pair of sound channel end, when this derailing switch is opened, starts this silent start circuit, makes the directly electrical ground connection of each sound channel end.
2. silencing apparatus as claimed in claim 1 is characterized in that: described ON-OFF control circuit comprises:
First diode, its positive terminal connects this working power, and negative pole end is connected with first capacitor of ground connection and produces described first voltage;
First resistor, wherein an end is connected with the negative pole end and first capacitor of this first diode;
Second resistor, wherein an end connects the other end of this first resistor and produces described second voltage, and the other end is connected with second capacitor of ground connection;
Second diode, its positive terminal connect the other end of this second capacitor and this second resistor, and negative pole end connects the positive terminal of this working power and this first diode.
3. silencing apparatus as claimed in claim 1 is characterized in that: described derailing switch includes first end, second end and the 3rd end; Described first end and second end connect this ON-OFF control circuit to receive described first voltage and second voltage respectively; When the voltage difference between this first voltage and this second voltage surpassed the critical voltage of this derailing switch, then this derailing switch was opened, and the 3rd end connects this silent start circuit and generation has driving voltage, and started this silent start circuit with this driving voltage.
4. silencing apparatus as claimed in claim 3 is characterized in that: described derailing switch is PNP electric crystal or PMOS electric crystal.
5. silencing apparatus as claimed in claim 1 is characterized in that: described silent start circuit comprises:
First electric crystal, its first end is the L channel end, second end connects described derailing switch by the 3rd resistor, and the 3rd end ground connection;
Second electric crystal, its first end is the R channel end, second end connects described derailing switch by the 4th resistor, and the 3rd end ground connection, and this R channel end and this L channel end will be formed this to the sound channel end.
6. silencing apparatus as claimed in claim 5 is characterized in that: described first electric crystal and second electric crystal are respectively NPN electric crystal or NMOS electric crystal.
7. silencing apparatus as claimed in claim 1 is characterized in that: described silencing apparatus includes the power supply of remote controller switching circuit; This power supply of remote controller switching circuit connects described ON-OFF control circuit, this power supply of remote controller switching circuit is in order to receiving the remote controller controlling signal, and according to this remote controller controlling signal remote-controlled power switch machine and change this second voltage that this ON-OFF control circuit produces.
8. silencing apparatus as claimed in claim 7 is characterized in that: described remote controller control circuit includes the 3rd electric crystal; First end of the 3rd electric crystal connects this switch control device circuit, and second end receives this power supply of remote controller switch controlling signal by the 5th resistor, and the 3rd end ground connection.
9. silencing apparatus as claimed in claim 8 is characterized in that: described the 3rd electric crystal is NPN electric crystal or NMOS electric crystal.
10. silencing apparatus as claimed in claim 8 is characterized in that: when described remote controller controlling signal is the high levle state, start the 3rd electric crystal, this second voltage that this ON-OFF control circuit is produced will draw reduces to zero potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201770418U CN201328180Y (en) | 2008-11-11 | 2008-11-11 | Silencing device capable of eliminating popcorn noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201770418U CN201328180Y (en) | 2008-11-11 | 2008-11-11 | Silencing device capable of eliminating popcorn noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201328180Y true CN201328180Y (en) | 2009-10-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201770418U Expired - Fee Related CN201328180Y (en) | 2008-11-11 | 2008-11-11 | Silencing device capable of eliminating popcorn noise |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201328180Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108076417A (en) * | 2016-11-18 | 2018-05-25 | 扬智科技股份有限公司 | Output-stage circuit |
-
2008
- 2008-11-11 CN CNU2008201770418U patent/CN201328180Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108076417A (en) * | 2016-11-18 | 2018-05-25 | 扬智科技股份有限公司 | Output-stage circuit |
| CN108076417B (en) * | 2016-11-18 | 2020-09-01 | 扬智科技股份有限公司 | Output stage circuit |
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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: 20091014 Termination date: 20091211 |