CN206149391U - Explodent elimination circuit - Google Patents
Explodent elimination circuit Download PDFInfo
- Publication number
- CN206149391U CN206149391U CN201621237416.6U CN201621237416U CN206149391U CN 206149391 U CN206149391 U CN 206149391U CN 201621237416 U CN201621237416 U CN 201621237416U CN 206149391 U CN206149391 U CN 206149391U
- Authority
- CN
- China
- Prior art keywords
- circuit
- switch
- loudspeaker unit
- shaping
- eliminates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
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Abstract
The utility model relates to an explodent elimination circuit, include that power, quiet sound control make circuit, gate circuit and filter circuit, the power input end that the filter circuit AND circuit was crossed to the power -on links to each other, and power and quiet sound signal process door circuit logic operate the back, export quiet sound control system circuit to, quiet sound control system circuit includes shaping circuit, a switch circuit, the 2nd switch circuit, L channel loudspeaker unit and R channel loudspeaker unit, and L channel loudspeaker unit is connected between shaping circuit's output and ground through a switch circuit, and R channel loudspeaker unit is connected between shaping circuit's output and ground through the 2nd switch circuit, the output of shaping circuit's input AND circuit links to each other, and controls switching on or breaking off of first and second switch circuit. This circuit realizes that loudspeaker unit postpones silence when falling the electricity in the TV set system, eliminates the pop sound that loudspeaker unit department produced, promotes user experience, components and parts are few in this circuit, have reduced the technology cost to it is long -pending effectively to have utilized the PCB face.
Description
Technical field
The utility model belongs to technical field of circuit design, and in particular to a kind of plosive in TV set-top box power-off
Eliminate circuit.
Background technology
With the improvement of people's living standards, DTV has stepped into huge numbers of families, and wherein DTV STB exists
Play an important role in DTV.In system for TV set power down, TV set-top box can produce residual voltage, and the remnants are electric
Pressure is transferred directly to loudspeaker unit, and loudspeaker unit can be made to produce plosive（That is Pop sounds）, affect Consumer's Experience, wherein loudspeaker list
Unit is generally divided into L channel loudspeaker unit and R channel loudspeaker unit.To overcome the Pop sounds, increase on hardware in prior art
Anti- plosive circuit, as shown in figure 1, in power down, electric capacity C1 electric discharges so that PMOS Q1 time delayed turn-off, output end OUT is height
Level, it is ensured that loudspeaker unit continues quiet after shutdown, realizes eliminating plosive purpose, but this circuit components part compared with
Many, occupancy pcb board area is larger, so as to increased process costs.
Utility model content
The utility model provides a kind of for plosive elimination circuit, by the output signal control of mute signal output circuit
System connection disconnects loudspeaker unit so that realize that loudspeaker unit postpones in system for TV set power down quiet, so as to eliminate in loudspeaker
The Pop sounds produced at unit, lift Consumer's Experience；Components and parts are few in the circuit, reduce process costs, and effectively utilizes
Pcb board area.
In order to solve above-mentioned technical problem, the utility model proposes that following technical scheme is solved：
A kind of plosive eliminates circuit, it is characterised in that including power supply, mute signal output circuit and quiet control electricity
Road；The mute signal output circuit includes gate circuit and filter circuit, and power supply is defeated with the power supply of gate circuit by filter circuit
Enter end to be connected, power supply and mute signal are exported to muting control circuit after gate circuit logical operation；Muting control circuit bag
Include shaping circuit, first switch circuit, second switch circuit, L channel loudspeaker unit and R channel loudspeaker unit, L channel loudspeaker
Unit is electrically connected between the output end of shaping circuit and ground by first switch, and R channel loudspeaker unit is opened by second
Pass is electrically connected between the output end of shaping circuit and ground；The input of shaping circuit is connected with the output end of gate circuit, and
Control first switch circuit and second switch circuit are turned on or off.Further, the gate circuit is same OR circuit.
Further, the shaping circuit is reverse shaping circuit；The first switch circuit and second switch circuit are equal
For NMOS tube, the grid of each NMOS tube is connected with the output end of reverse shaping circuit.
Used as a scheme of reverse shaping circuit, reverse shaping circuit includes the switch element and pull-up of high level conducting
Resistance, the pull-up resistor is connected to the output end of the switch element of high level conducting.
Further, the switch element of the high level conducting is NPN triode, and its base stage connects with the output end of gate circuit
Connect, emitter stage is connected to ground, colelctor electrode is connected to pull-up resistor.
Used as another alternative of reverse shaping circuit, the reverse shaping circuit includes the switch of low level conducting
Element and pull down resistor, the pull down resistor is connected to the output end of the switch element of low level conducting.
Further, the switch element of the low level conducting is PNP triode, and its base stage connects with the output end of gate circuit
Connect, emitter stage is connected to high level, colelctor electrode is connected to pull down resistor.
Used as another alternative of shaping circuit, the shaping circuit is positive shaping circuit, the first switch
Circuit and second switch circuit are PMOS, and the grid of each PMOS is connected with the output end of positive shaping circuit.
In order in TV set-top box power down, make loudspeaker unit delay quiet, and then elimination power down is produced at loudspeaker unit
Raw plosive, the filter circuit is electric including the filter capacitor being connected in parallel between the power input of gate circuit and ground and first
Resistance, and power supply is connected to the input of filter circuit by forward diode.
Further, power supply is connected to the first input end of gate circuit and by 3rd resistor ground connection by second resistance,
Mute signal is connected to the second input of gate circuit by pull down resistor.
Compared with prior art, advantage of the present utility model and beneficial effect are：Power supply and mute signal are through gate circuit
Logical operation, exports for controlling first switch circuit and second switch circuit turn-on or disconnection, with normal in system for TV set
First switch circuit and second switch circuit turn-on realize the normal work of loudspeaker unit during work, or in first switch circuit
Realize that the active of loudspeaker unit is quiet when disconnecting with second switch circuit；In system for TV set power down, filter circuit is door electricity
Road provides the electric energy of short time, power supply and mute signal through gate circuit logical operation, its output control first switch circuit and
The disconnection of second switch circuit, realizes that delay of the loudspeaker unit in system power failure is quiet, eliminates what is produced at loudspeaker unit
Pop sounds, lift Consumer's Experience；Components and parts are few in the circuit, reduce process costs, and are effectively utilized pcb board area；Should
Circuit uses Digital Circuit Control, signal jitter to disturb little, efficiency high.
Description of the drawings
In order to be illustrated more clearly that the utility model embodiment or technical scheme of the prior art, below will be to this practicality
The accompanying drawing to be used needed for new embodiment or description of the prior art is made one and is briefly introduced, it should be apparent that, it is described below
Accompanying drawing is some embodiments of the present utility model, for one of ordinary skill in the art, is not paying creative work
On the premise of, can be with according to these accompanying drawings acquisition other accompanying drawings.
Fig. 1 is the circuit theory diagrams that prior art borehole blasting sound eliminates circuit；
Fig. 2 is the circuit theory diagrams that plosive of the present utility model eliminates mute signal output circuit in circuit；
Fig. 3 is the circuit theory diagrams that plosive of the present utility model eliminates muting control circuit in circuit.
Specific embodiment
It is new below in conjunction with this practicality to make purpose, technical scheme and the advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, is clearly and completely described, it is clear that retouched to the technical scheme in the utility model embodiment
The embodiment stated is a part of embodiment of the utility model, rather than the embodiment of whole.Based on the enforcement in the utility model
Example, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made is belonged to
The scope of the utility model protection.
In system for TV set power down moment, residual voltage pulse can be produced on TV set-top box, if the pulse is transferred to
Loudspeaker unit will produce Pop sounds, therefore the purpose of this utility model is to avoid TV set-top box power down moment by loudspeaker list
Unit is connected into loop, and such momentary pulse would not be transferred to loudspeaker unit, so as to reach the purpose for eliminating Pop sounds.
As shown in Fig. 2 the present embodiment is related to a kind of plosive eliminates circuit, including the electricity that electric energy is provided for system for TV set
Source VCC, mute signal output circuit and muting control circuit；Mute signal output circuit includes filter circuit 1 and gate circuit 2,
Power supply VCC is connected by filter circuit 1 with the power input VDD of gate circuit 2, and power supply VCC and mute signal MUTE pass through door
After the logical operation of circuit 2, export to muting control circuit；Muting control circuit includes shaping circuit 3, first switch circuit
Q3, second switch circuit Q4, L channel loudspeaker unit（It is not shown）With R channel loudspeaker unit（It is not shown）, L channel loudspeaker list
Unit is connected between the output end of shaping circuit 3 and ground by first switch circuit Q3, and R channel loudspeaker unit is opened by second
Powered-down road Q4 is connected between 3 output ends of shaping circuit and ground；Output end OUT of gate circuit 2 and the input of shaping circuit 3
CTRL is connected, and the input CTRL control first switch circuit Q3's and second switch circuit Q4 of shaping circuit 3 is turned on or off.
In the present embodiment, L_OUT refers to the positive pole of L channel loudspeaker unit, its minus earth；R_OUT is referring to R channel loudspeaker unit just
Pole, its minus earth.MUTE is the mute signal of L channel loudspeaker unit and R channel loudspeaker unit, normal in system for TV set
During work, MUTE is always low level, unless when extraneous active control loudspeaker unit is quiet, MUTE is changed into high level.
Specifically, in the present embodiment, as shown in Fig. 2 filter circuit 1 includes being connected in parallel on the power input of gate circuit 2
Filter capacitor C201 and first resistor R103 between VDD and ground, power supply VCC are connected to filtered electrical by forward diode D301
The input on road 1, is that filter capacitor C201 is charged while gate circuit 2 provides electric energy, and wherein forward diode D301 is avoided
When filter capacitor C201 discharges, electric current is poured in down a chimney to the first input end A of gate circuit 2 by second resistance R104.Power supply VCC leads to
Cross second resistance R104 to be connected to the first input end A of gate circuit 2 and be grounded by 3rd resistor R101, the second of gate circuit 2
Input B is connected by pull down resistor R102 with the mute signal MUTE of L channel loudspeaker unit and R channel loudspeaker unit.This
Gate circuit 2 in embodiment can be CD4077 chips or biconditional gate 54/74LS266 chips, it is also possible to be made up of NAND gate
Or be made up of nor gate, or the suitable gate circuit 2 being combined into by other gate circuits.In the present embodiment, gate circuit 2 is same
OR circuit, the truth table of the present embodiment gate circuit 2 is as follows：
In the present embodiment, during system for TV set power down, gate circuit 2 is not in state 4, because the first of gate circuit 1
When input A is low level, the external world will not again control active mute signal MUTE for high level.
As shown in figure 3, in the present embodiment, shaping circuit 3 can be reverse shaping circuit, and it includes NPN triode Q5
With pull-up resistor R4, the base stage of Q5 is connected with output end OUT of gate circuit 2, and its emitter stage is connected to ground, pull-up resistor R4 one end
The colelctor electrode of Q5 is connected to, the other end is connected to power supply VCC, when system for TV set normal work, in the input of shaping circuit 3
When end CTRL is low level, Q5 is not turned on, and is high level at Q5 colelctor electrodes, is height in the input CTRL inputs of shaping circuit 3
During level, Q5 conductings are low level at Q5 colelctor electrodes.Alternatively, shaping circuit 3 can also be PNP triode and pull down resistor,
The base stage of PNP is connected with output end OUT of gate circuit 2, and emitter stage is connected with power supply VCC, and pull down resistor one end is connected to PNP's
On colelctor electrode, the other end is connected to the ground, and when system for TV set normal work, is in the input CTRL inputs of shaping circuit 3
During low level, Q5 conductings are high level at Q5 colelctor electrodes, and when the input CTRL inputs of shaping circuit 3 are high level, Q5 is not
Conducting, it is drop-down for low level by pull down resistor at Q5 colelctor electrodes.Or reversely shaping circuit can be patrolled for NAND gate, nor gate etc.
Collect gate circuit.
As shown in Figures 2 and 3, in the present embodiment, first switch circuit Q3 and second switch circuit Q4 are NMOS tube,
The grid of each NMOS tube is connected with the colelctor electrode of Q5, and when in system for TV set normal work, power supply VCC is filter circuit 1
Power with gate circuit 2, the power input VDD of gate circuit 2 is high level, first input end A is high level, the second input B
It is drop-down for low level by pull down resistor R102, therefore output end OUT of gate circuit 2 is low level for the base stage of low level, i.e. Q5,
Q5 is not turned on, therefore is high level at the colelctor electrode of Q5, and Q3 and Q4 is turned on, and L channel loudspeaker unit and R channel loudspeaker unit connect
Entry loop, loudspeaker unit normal work；When needing actively quiet, active mute signal MUTE is output as high level, gate circuit 2
Output end OUT is high level for the base stage of high level, i.e. Q5, and Q5 is turned on, therefore is low level at the colelctor electrode of Q5, and Q3 and Q4 is not
Conducting, L channel loudspeaker unit and R channel loudspeaker unit do not access loop, and loudspeaker unit is in quiet；Work as system for TV set
During power down, the power input VDD short time of gate circuit 2（This time is due to the electric capacity of the filter capacitor C201 of filter circuit 1
The resistance of value and first resistor R103 determines, is about 0.1 second in the present embodiment）It is interior by filter capacitor C201 in filter circuit 1
Electric discharge is provided, and first input end A is low level, and the second input B is drop-down for low level by pull down resistor R102, therefore gate circuit
The 2 of short duration base stage for high level, i.e. Q5 of output end OUT is high level, due to the power supply VCC power down at the colelctor electrode of Q5, Q5
It is not turned on, accordingly Q3 and Q4 are not turned on, L channel loudspeaker unit and R channel loudspeaker unit do not access loop, loudspeaker unit
In quiet.Due to the presence of filter circuit 1, in system power failure, loudspeaker unit delay is quiet, eliminates and is produced in loudspeaker unit
Raw Pop sounds, lift Consumer's Experience.
Used as another alternative of shaping circuit 3, shaping circuit 3 can also be positive shaping circuit, wherein first
On-off circuit Q3 and second switch circuit Q4 are PMOS, the grid of each PMOS with the output end phase of positive shaping circuit
Even.The positive shaping circuit can be the logic gates such as OR gate and door.When in system for TV set normal work, power supply VCC
It is that filter circuit 1 and gate circuit 2 are powered, the power input VDD of gate circuit 2 is high level, and first input end A is high level,
Second input B is drop-down for low level by pull down resistor R102, therefore output end OUT of gate circuit 2 is low level, i.e., positive whole
Shape circuit output low level, Q3 and Q4 are turned on, and L channel loudspeaker unit and R channel loudspeaker unit access loop, and loudspeaker unit is just
Often work；When needing actively quiet, active mute signal MUTE is output as high level, and output end OUT of gate circuit 2 is high electricity
Flat, i.e., positive shaping circuit output high level, Q3 and Q4 is not turned on, and L channel loudspeaker unit and R channel loudspeaker unit do not connect
Entry loop, loudspeaker unit is in quiet；When system for TV set power down, the power input VDD short time of gate circuit 2（The section
Time is determined due to the filter capacitor C201 and first resistor R103 of filter circuit 1）It is interior by filter capacitor C201 in filter circuit 1
Electric discharge is provided, and first input end A is low level, and the second input B is drop-down for low level by pull down resistor R102, therefore gate circuit
2 output end OUT is of short duration for high level, i.e., the input of positive shaping circuit is high level, and the output of positive shaping circuit can be with
It is the connection of high level or positive shaping circuit disconnection and Q3 and Q4, both of these case can all cause Q3 and Q4 to be not turned on, left
Sound channel loudspeaker unit and R channel loudspeaker unit do not access loop, and loudspeaker unit is in quiet.
The present embodiment plosive eliminates circuit, and power supply VCC and mute signal MUTE carries out logical operation through gate circuit 2,
It is used to control being turned on or off for Q3 and Q4 with output end OUT of OR circuit 2, in system for TV set normal work, MUTE
For low level, low level is exported with OR circuit 2, the normal work of loudspeaker unit is realized in control Q3 and Q4 conductings, and MUTE is height
Level, with OR circuit 2 high level is exported, and control Q3 and Q4 disconnects, and realizes that the active of loudspeaker unit is quiet；In system for TV set
During power down, filter circuit 1 is the electric energy that same OR circuit 2 provides the short time, and MUTE is low level, and with OR circuit 2 height is exported
Level, continues to control Q3 and Q4 disconnections, realizes that delay of the loudspeaker unit in system power failure is quiet, eliminates and is produced at loudspeaker unit
Raw Pop sounds, lift Consumer's Experience；Components and parts are few in the circuit, reduce process costs, and are effectively utilized pcb board face
Product；The circuit uses Digital Circuit Control, signal jitter to disturb little, efficiency high.
Finally it should be noted that：Above example only to illustrate the technical solution of the utility model, rather than a limitation；
Although being described in detail to the utility model with reference to the foregoing embodiments, it will be understood by those within the art that：
It still can modify to the technical scheme described in foregoing embodiments, or which part technical characteristic is carried out etc.
With replacement；And these modifications or replacement, do not make each embodiment technology of essence disengaging the utility model of appropriate technical solution
The spirit and scope of scheme.
Claims (10)
1. a kind of plosive eliminates circuit, it is characterised in that including power supply, mute signal output circuit and muting control circuit；
The mute signal output circuit includes gate circuit and filter circuit, and power supply is by filter circuit and the power input of gate circuit
It is connected, power supply and mute signal are exported to muting control circuit after gate circuit logical operation；Muting control circuit includes whole
Shape circuit, first switch circuit, second switch circuit, L channel loudspeaker unit and R channel loudspeaker unit, L channel loudspeaker list
Unit is electrically connected between the output end of shaping circuit and ground by first switch, and R channel loudspeaker unit is by second switch electricity
Road is connected between the output end of shaping circuit and ground；The input of shaping circuit is connected with the output end of gate circuit, and controls
First switch circuit and second switch circuit are turned on or off.
2. plosive according to claim 1 eliminates circuit, it is characterised in that the gate circuit is same OR circuit.
3. plosive according to claim 1 and 2 eliminates circuit, it is characterised in that the shaping circuit is reverse shaping
Circuit；The first switch circuit and second switch circuit are NMOS tube, the grid of each NMOS tube with reverse shaping circuit
Output end be connected.
4. plosive according to claim 3 eliminates circuit, it is characterised in that the reverse shaping circuit includes high level
The switch element and pull-up resistor of conducting, the pull-up resistor is connected to the output end of the switch element of high level conducting.
5. plosive according to claim 4 eliminates circuit, it is characterised in that the switch element of the high level conducting is
NPN triode, its base stage is connected with the output end of gate circuit, and emitter stage is connected with low level, and colelctor electrode is connected to pull-up resistor.
6. plosive according to claim 3 eliminates circuit, it is characterised in that the reverse shaping circuit includes low level
The switch element and pull down resistor of conducting, the pull down resistor is connected to the output end of the switch element of low level conducting.
7. plosive according to claim 6 eliminates circuit, it is characterised in that the switch element of the low level conducting is
PNP triode, its base stage is connected with the output end of gate circuit, and emitter stage is connected to high level, and colelctor electrode is connected to pull down resistor.
8. plosive according to claim 1 and 2 eliminates circuit, it is characterised in that the shaping circuit is positive shaping
Circuit, the first switch circuit and second switch circuit are PMOS, the grid of each PMOS with positive shaping circuit
Output end be connected.
9. plosive according to claim 1 and 2 eliminates circuit, it is characterised in that the filter circuit includes being connected in parallel on
Filter capacitor and first resistor between the power input and ground of gate circuit, and power supply is connected to filtering by forward diode
The input of circuit.
10. the plosive according to any one of claim 4-7 eliminates circuit, it is characterised in that power supply is electric by second
Resistance is connected to the first input end of gate circuit and is grounded by 3rd resistor, and mute signal is connected to gate circuit by pull down resistor
The second input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621237416.6U CN206149391U (en) | 2016-11-18 | 2016-11-18 | Explodent elimination circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621237416.6U CN206149391U (en) | 2016-11-18 | 2016-11-18 | Explodent elimination circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206149391U true CN206149391U (en) | 2017-05-03 |
Family
ID=58626133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621237416.6U Withdrawn - After Issue CN206149391U (en) | 2016-11-18 | 2016-11-18 | Explodent elimination circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206149391U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106375690A (en) * | 2016-11-18 | 2017-02-01 | 歌尔科技有限公司 | Pop sound elimination circuit |
| CN113115180A (en) * | 2021-04-28 | 2021-07-13 | 广州朗国电子科技有限公司 | Plosive removing device of audio output end and audio equipment |
-
2016
- 2016-11-18 CN CN201621237416.6U patent/CN206149391U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106375690A (en) * | 2016-11-18 | 2017-02-01 | 歌尔科技有限公司 | Pop sound elimination circuit |
| CN106375690B (en) * | 2016-11-18 | 2023-07-14 | 歌尔科技有限公司 | Plosive eliminating circuit |
| CN113115180A (en) * | 2021-04-28 | 2021-07-13 | 广州朗国电子科技有限公司 | Plosive removing device of audio output end and audio equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170503 Effective date of abandoning: 20230714 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170503 Effective date of abandoning: 20230714 |