CN206865726U - Shock-wave noise preventing circuit and electronic equipment - Google Patents
Shock-wave noise preventing circuit and electronic equipment Download PDFInfo
- Publication number
- CN206865726U CN206865726U CN201720680206.2U CN201720680206U CN206865726U CN 206865726 U CN206865726 U CN 206865726U CN 201720680206 U CN201720680206 U CN 201720680206U CN 206865726 U CN206865726 U CN 206865726U
- Authority
- CN
- China
- Prior art keywords
- switch circuit
- shock
- wave noise
- output end
- noise preventing
- 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.)
- Active
Links
Abstract
The disclosure provides a kind of shock-wave noise preventing circuit and electronic equipment.Wherein, the shock-wave noise preventing circuit is applied to the electronic equipment comprising master chip and power amplifier chips, and shock-wave noise preventing circuit includes first switch circuit and second switch circuit；First switch circuit and second switch circuit connect voltage source respectively；The output end of the input connection master chip of first switch circuit；The output end of the input connection first switch circuit of second switch circuit, the control terminal of the output end connection power amplifier chips of second switch circuit；When electric on an electronic device, the low level signal of master chip output end triggers the first control signal of first switch circuit output to the input of second switch circuit, to trigger the control terminal that second switch circuit output controls the second control signal that power amplifier chips are off to power amplifier chips.The shock-wave noise preventing circuit and electronic equipment of the embodiment of the present disclosure, electronic equipment can be avoided to produce plosive in powered on moment, and shock-wave noise preventing circuit is simple in construction, cost-effective.
Description
Technical field
This disclosure relates to electronic technology field, more particularly to shock-wave noise preventing circuit and electronic equipment.
Background technology
Household appliances are in start, because the simulation output pin position of master chip has flashy voltage change, this voltage
Change can produce electric current via the coupled capacitor coupling in audio frequency simulation output circuit, and electric current passes through audio output apparatus (such as loudspeaker
, earphone etc.) when produce plosive.And coupled capacitor is bigger, or voltage change is faster, and plosive will be more obvious.Some
The circuit element of better performances is used in product, to eliminate start-up noises, but circuit element is relative complex, cost is very high.
Utility model content
The disclosure provides a kind of shock-wave noise preventing circuit and electronic equipment.
A kind of shock-wave noise preventing circuit is provided according to the first aspect of the embodiment of the present disclosure, applied to including master chip, power amplifier core
The electronic equipment of piece and voltage source, shock-wave noise preventing circuit include first switch circuit and second switch circuit；The first switch electricity
Road and the second switch circuit connect the voltage source respectively；The input of the first switch circuit connects the master chip
Output end；The input of the second switch circuit connects the output end of the first switch circuit, the second switch electricity
The output end on road connects the control terminal of the power amplifier chips；
Wherein, when electric on the electronic equipment, the low level signal of the master chip output end triggers the first switch
The control signal of circuit output first is controlled to the input of the second switch circuit with triggering the second switch circuit output
The second control signal that the power amplifier chips are off to the power amplifier chips control terminal.
Further, the first switch circuit includes the first triode；Described in the base stage connection of first triode
The output end of master chip, the grounded emitter of first triode, the colelctor electrode of first triode connect the voltage
Source.
Further, the second switch circuit includes the second triode；Described in the base stage connection of second triode
The output end of first switch circuit, the grounded emitter of second triode, the colelctor electrode connection institute of second triode
State voltage source.
Further, the shock-wave noise preventing circuit also includes storage capacitor, diode and first resistor；The storage capacitor
One end ground connection, the other end connects the output end of the second switch circuit, and the anode of the diode connects the energy storage electricity
The ungrounded end held, the negative electrode of the diode connect the voltage source, and the first resistor is connected with the diodes in parallel；
Wherein, on the electronic equipment after electricity, the diode is in cut-off state, and the voltage source is the power amplifier core
Piece provides operating voltage, and the storage capacitor is charged；When electric under the electronic equipment, the diode is on
State, the loop that the storage capacitor is formed by the diode and the first resistor are discharged.
Further, the first resistor is connected to the output end of the second switch circuit and the anode of the diode
Between, or, the first resistor is connected between output end and the voltage source of the second switch circuit.
Further, the output end of the master chip is connected to the base stage of first triode through second resistance.
Further, the voltage source is connected to the colelctor electrode of first triode through 3rd resistor.
Further, the output end of the first switch circuit is connected to the base of second triode through the 4th resistance
Pole.
A kind of electronic equipment, including voltage source, master chip, power amplifier chips are provided according to the second aspect of the embodiment of the present disclosure
And above-mentioned shock-wave noise preventing circuit；The shock-wave noise preventing circuit is connected to the output end of the master chip and the control of the power amplifier chips
Between end processed；First switch circuit and second switch circuit in the shock-wave noise preventing circuit connect the voltage source respectively；It is described
The input of first switch circuit in shock-wave noise preventing circuit connects the output end of the master chip, and the in the shock-wave noise preventing circuit
The output end of two on-off circuits connects the control terminal of the power amplifier chips.
The shock-wave noise preventing circuit and electronic equipment of the embodiment of the present disclosure, by setting first switch circuit and second switch electricity
Road, on an electronic device electric moment, master chip output end is low level signal, so as to control first switch circuit output first
Control signal, to cause the control signal of second switch circuit output second, it is off power amplifier chips, therefore can keep away
Exempt from moment generation plosive electric on electronic equipment.And the shock-wave noise preventing circuit of the embodiment of the present disclosure only needs two on-off circuits
Coordinate and realize, circuit structure is simple, cost-effective.
It should be appreciated that the general description and following detailed description of the above are only exemplary and explanatory, not
The disclosure can be limited.
Brief description of the drawings
Accompanying drawing herein is merged in specification and forms the part of this specification, shows and meets disclosure implementation
Example, and for explaining principle of the invention together with specification.
Fig. 1 is a kind of structured flowchart of shock-wave noise preventing circuit shown in the exemplary embodiment of the disclosure one；
Fig. 2 is the structured flowchart of another shock-wave noise preventing circuit shown in the exemplary embodiment of the disclosure one；
Fig. 3 is the structured flowchart of another shock-wave noise preventing circuit shown in the exemplary embodiment of the disclosure one；
Fig. 4 is the structured flowchart of another shock-wave noise preventing circuit shown in the exemplary embodiment of the disclosure one；
Fig. 5 is the structured flowchart of a kind of electronic equipment shown in the exemplary embodiment of the disclosure one.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the disclosure.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects be described in detail in claims, the disclosure.
It is only merely for the purpose of description specific embodiment in the term that the disclosure uses, and is not intended to be limiting the disclosure.
" one kind " of singulative used in disclosure and the accompanying claims book, " described " and "the" are also intended to including majority
Form, unless context clearly shows that other implications.
Below in conjunction with the accompanying drawings, the shock-wave noise preventing circuit and electronic equipment of utility model are described in detail.What is do not conflicted
In the case of, the feature in following embodiment and embodiment can be mutually combined.
Fig. 1 is a kind of structured flowchart of shock-wave noise preventing circuit 10 of the exemplary embodiment of the disclosure one.The shock-wave noise preventing circuit 10
Applied to the electronic equipment for including master chip 20, power amplifier chips 30 and voltage source 40.Shock-wave noise preventing circuit 10 includes first switch electricity
Road 11 and second switch circuit 12, as shown in Figure 1.
First switch circuit 11 and second switch circuit 12 connect voltage source 40 respectively.In an optional embodiment, the
One on-off circuit 11 and second switch circuit 12 can be connected to same voltage source 40, in another optional embodiment, the
One on-off circuit 11 connects a voltage source 40, and second switch circuit 12 can connect another voltage source 40, i.e. first switch
Circuit 11 and second switch circuit 12 are powered by two independent power supplys respectively.Opened in Fig. 1 with first switch circuit 11 and second
Powered-down road 12 illustrates exemplified by each connecting a voltage source 40.
With reference to figure 1, the input 111 of first switch circuit 11 connects the output end 201 of master chip 20；Second switch circuit
12 input 121 connects the output end 112 of first switch circuit 11, and the output end 122 of second switch circuit 12 connects power amplifier
The control terminal 301 of chip 30.In the embodiment of the present disclosure, the control terminals 301 of power amplifier chips 30 can be Jing Yin control terminal, power amplifier core
Piece 30 can also connect loudspeaker, earphone even load.In some instances, when the control terminal 301 of power amplifier chips 30 is in high level,
The normal work of power amplifier chips 30, power amplifier chips 30 do not work (i.e. power amplifier chips 30 do not export sound) during low level.Certainly, at it
In his some examples, when the control terminal 301 of power amplifier chips 30 is in low level, the normal work of power amplifier chips 30, work(during high level
Chip 30 is put not work.
When following examples with the control terminal 301 of power amplifier chips 30 by high level is in, the normal work of power amplifier chips 30 is low
Power amplifier chips 30 further illustrate exemplified by not working during level.
Generally, when electric on electronic equipment, the alternating current of electronic equipment access first passes through AC-DC and is converted to direct current
Electricity, then it is converted into each system by DC-DC or LDO (Low Dropout Regulator, low pressure difference linear voltage regulator) again
Powered needed for system.In the present embodiment, voltage source 40 can access the voltage after AC-DC is changed, and master chip 20 can access DC-DC
Or the voltage after LDO conversions.Therefore, when electric on an electronic device, master chip 30 electric electric must must have delay than voltage source 40.
That is, electric (moment can be millisecond, the period of musec order) in a flash on an electronic device, master chip 30 not yet it is electric, and
Voltage source 40 it is electric.
In the present embodiment, when electric on electronic equipment, refer on electronic equipment it is electric in a flash, in the moment, master chip 30
Not yet it is electric, the voltage of 30 each pin of master chip (including input and output end) is low level, and master chip 30 does not have started
Work.On electronic equipment after electricity, refer to master chip 30 it is electric and electric under starting to electronic equipment at the time of start working when.
When electric on an electronic device (refer on electronic equipment electric in a flash), voltage source 40 electric and output voltage, now
Master chip 20 not yet it is electric, i.e., the output end 201 of master chip 20 is still in low level.The low electricity of the output end 201 of master chip 20
Ordinary mail number triggering first switch circuit 11 exports the first control signal to the input 121 of second switch circuit 12, to trigger the
The second control signal that the output control power amplifier chips 30 of two on-off circuit 12 are off to power amplifier chips 30 control terminal
301.Therefore, electric moment on an electronic device, power amplifier chips 30 are off, therefore the loudspeaker being connected with power amplifier chips 30
Or earphone even load be also stopped, so as to avoid the generation of electronic equipment powered on moment plosive.And the disclosure
The shock-wave noise preventing circuit 10 of embodiment only needs two on-off circuits to coordinate realization, and circuit structure is simple, cost-effective.
Fig. 2 is the structured flowchart of another shock-wave noise preventing circuit 10 of the exemplary embodiment of the disclosure one.As shown in Fig. 2
In one optional embodiment, first switch circuit 11 includes the first triode；Second switch circuit 12 includes the second triode；
In another optional embodiment, first switch circuit 11 and second switch circuit 12 can also include MOS field
Effect pipe, or other electronic switches etc..Illustrated in the present embodiment by taking triode as an example, wherein the base of the first triode
The output end 201 of pole b connections master chip 20, the emitter e ground connection of the first triode, the colelctor electrode connection voltage of the first triode
Source 40.The output end 112 of the base stage b connection first switches circuit 11 of second triode, the emitter e ground connection of the second triode,
The colelctor electrode c connections voltage source 40 of second triode.
When electric on an electronic device (refer on electronic equipment electric in a flash), voltage source 40 electric and output voltage, and this
When master chip 20 not yet it is electric, i.e., the output end 201 of master chip 20 is still in low level.The now output end 201 of master chip 20
Low level signal the first triode is in cut-off state, therefore the voltage that exports of voltage source 40 makes the base stage of the second triode
B is in high level, so as to trigger the second triode ON, because the emitter e of the second triode is grounded so that power amplifier chips 30
Control terminal 301 be pulled low, power amplifier chips 30 do not work, therefore the loudspeaker or earphone even load being connected with power amplifier chips 30
It is stopped, plosive is produced so as to avoid electronic equipment powered on moment.And the shock-wave noise preventing circuit 10 of the embodiment of the present disclosure
Only need two triodes to coordinate to realize, circuit structure is simple, cost-effective.
Because in the prior art, when in shutdown, the simulation output pin position of master chip also has in a flash household appliances
Voltage change, this voltage change can equally produce plosive.Based on this, the embodiment of the present disclosure proposes another anti-sonic boom
The structured flowchart of circuit 10.As shown in figure 3, as the presently preferred embodiments, shock-wave noise preventing circuit 10 can also include storage capacitor C, two
Pole pipe D and first resistor R1.
In the embodiment of the present disclosure, with reference to figure 3, storage capacitor C one end is grounded, other end connection second switch circuit 12
Output end 122.Diode D anode connection storage capacitor C ungrounded end, diode D negative electrode connection voltage source 40.One
In optional embodiment, storage capacitor C negative pole can be grounded, the output end 122 of positive pole connection second switch circuit 12, and
And storage capacitor C cathode connecting diode D anode.
In the embodiment of the present disclosure, first resistor R1 is connected in parallel with diode D, in an optional embodiment, the first electricity
Resistance R1 can be connected between the output end 122 of second switch circuit 12 and diode D anode, i.e.,：The one of first resistor R1
The output end 122 of end connection second switch circuit 12, other end connection diode D anode, the output of second switch circuit 12
Wire connects between end 122 and voltage source 40；In another optional embodiment, first resistor R1 can be connected to second switch
Between the output end 122 and voltage source 40 of circuit 12, i.e.,：The output end of first resistor R1 one end connection second switch circuit 12
122, other end connection voltage source 40, wire connects between the output end 122 of second switch circuit 12 and diode D anode；
In another optional embodiment, first resistor R1 can include two resistance, be R1a and R1b respectively, as shown in Fig. 3, its
Middle R1a is connected between the output end 122 of second switch circuit 12 and diode D anode, and R1b is connected to second switch circuit
Between 12 output end 122 and voltage source 40.
In the disclosed embodiments, when electric on an electronic device (refer on electronic equipment electric in a flash), now master chip
20 not yet it is electric, the output end 201 of master chip 20 still in low level, and voltage source 40 it is electric and start output voltage.Now
The low level signal of the output end 201 of master chip 20 makes the first triode be in cut-off state, therefore the electricity that voltage source 40 exports
Pressure makes the base stage b of the second triode be in high level, so as to trigger the second triode ON, due to the emitter stage of the second triode
E is grounded so that and the control terminal 301 of power amplifier chips 30 is pulled low, and power amplifier chips 30 do not work, therefore be connected with power amplifier chips 30
Loudspeaker or earphone even load are also stopped, and plosive is produced so as to avoid electronic equipment powered on moment.
On electronic equipment after electricity, master chip 30 is obtained electric and started working, and the output end 201 of master chip 20 exports high level,
Now the high level signal of the output end 201 of master chip 20 makes the first triode in the conduction state, due to the first triode
Emitter e is grounded so that the base stage b of the second triode be in low level state, so that the cut-off of the second triode, then voltage source
The voltage of 40 outputs causes the normal work of power amplifier chips 30.Now, the voltage that voltage source 40 exports causes diode D to be in reverse
On the one hand cut-off state, the voltage that voltage source 40 exports provide operating voltage for power amplifier chips 30, be on the other hand storage capacitor C
Charged.
(refer to electric moment under electronic equipment) when electric under electronic equipment, voltage source 40 moment dead electricity, diode D is in positive guide
Logical state, storage capacitor C are discharged by the diode D and first resistor R1 loops formed.Therefore, the control of power amplifier chips 30
End 301 processed is dragged down by moment, is off power amplifier chips 30, therefore the loudspeaker or earphone being connected with power amplifier chips 30
Even load is also stopped, and plosive is produced so as to avoid electric moment under electronic equipment.
In the embodiment of the present disclosure, first resistor R1 resistance, and R1a and R1b resistance can be set as needed
Put, R1a and R1b resistance can be the same or different, depending on specific visual actual conditions.
Fig. 4 is the structured flowchart of another shock-wave noise preventing circuit 10 shown in the exemplary embodiment of the disclosure one.As preferred
Embodiment, the shock-wave noise preventing circuit 10 in the present embodiment can also include second resistance R2, and with reference to figure 4, second resistance R2 is connected to
Between the base stage b of the triode of output end 201 and first of master chip 20, current limliting can be carried out to the electric current that master chip 20 exports,
So as to reduce the conducting power consumption of the first triode.
In an optional embodiment, with continued reference to Fig. 4.Shock-wave noise preventing circuit 10 can also include 3rd resistor R3, and the 3rd
Resistance R3 is connected between the colelctor electrode c of the triode of voltage source 40 and first.In another optional embodiment, with continued reference to figure
4, shock-wave noise preventing circuit 10 can also include the 4th resistance R4, and the 4th resistance R4 is connected to the colelctor electrode c and second of the first triode
Between the base stage b of triode.3rd resistor R3 and the 4th resistance R4 can equally play metering function, for reducing by the two or three pole
The conduction loss of pipe.
In the disclosed embodiments, second resistance R2,3rd resistor R3 and the 4th resistance R4 resistance can bases
Depending on being actually needed.
Fig. 5 is the structured flowchart of a kind of electronic equipment 60 shown in the exemplary embodiment of the disclosure one, as shown in figure 5, electric
Sub- equipment 60 includes the shock-wave noise preventing circuit 10 of voltage source 40, master chip 20, power amplifier chips 30 and above-mentioned diagram embodiment.
Wherein, shock-wave noise preventing circuit 10 be connected to the output end 201 of master chip 20 and power amplifier chips 30 control terminal 301 it
Between；First switch circuit 11 and second switch circuit 12 in shock-wave noise preventing circuit 10 connect a voltage source 40 respectively；Anti- sonic boom
The input 111 of first switch circuit 11 in circuit 10 connects the output end 201 of master chip 20, and the in shock-wave noise preventing circuit 10
The output end 122 of two on-off circuits 12 connects the control terminal 301 of power amplifier chips 30.
In an optional embodiment, power amplifier chips 30 can also connect loudspeaker, earphone even load, electric on an electronic device
Moment, by the effect of two on-off circuits in shock-wave noise preventing circuit 10, power amplifier chips 30 is stopped, avoid in electronics
Product powered on moment produces plosive.Moreover, in another optional embodiment, the electric moment under electronic equipment, also by anti-
The loop that diode D and first resistor R1 in sonic boom circuit 10 are formed is discharged, and power amplifier chips 30 can be made to obtain control terminal
Moment drags down, and avoids the electric moment under electronic product from producing plosive.And shock-wave noise preventing circuit 10 must be simple in construction, cost is low.
The preferred embodiment of the disclosure is the foregoing is only, not limiting the disclosure, all essences in the disclosure
God any modification, equivalent substitution and improvements done etc., should be included within the scope of disclosure protection with principle.
Claims (9)
- A kind of 1. shock-wave noise preventing circuit, applied to the electronic equipment for including master chip, power amplifier chips and voltage source, it is characterised in that The shock-wave noise preventing circuit includes：First switch circuit and second switch circuit；The first switch circuit and the second switch circuit connect the voltage source respectively；The input of the first switch circuit connects the output end of the master chip；The input of the second switch circuit connects the output end of the first switch circuit, the second switch circuit it is defeated Go out the control terminal that end connects the power amplifier chips；Wherein, when electric on the electronic equipment, the low level signal of the master chip output end triggers the first switch circuit The first control signal is exported to the input of the second switch circuit, to trigger described in the second switch circuit output control The second control signal that power amplifier chips are off to the power amplifier chips control terminal.
- 2. shock-wave noise preventing circuit according to claim 1, it is characterised in that the first switch circuit includes the one or three pole Pipe；The base stage of first triode connects the output end of the master chip, the grounded emitter of first triode, institute The colelctor electrode for stating the first triode connects the voltage source.
- 3. shock-wave noise preventing circuit according to claim 1, it is characterised in that the second switch circuit includes the two or three pole Pipe；The base stage of second triode connects the output end of the first switch circuit, and the emitter stage of second triode connects Ground, the colelctor electrode of second triode connect the voltage source.
- 4. according to the shock-wave noise preventing circuit described in any one of claims 1 to 3, it is characterised in that the shock-wave noise preventing circuit also includes Storage capacitor, diode and first resistor；One end ground connection of the storage capacitor, the other end connect the output end of the second switch circuit, the sun of the diode Pole connects the ungrounded end of the storage capacitor, and the negative electrode of the diode connects the voltage source, the first resistor and institute State diodes in parallel connection；Wherein, on the electronic equipment after electricity, the diode is in cut-off state, and the voltage source is that the power amplifier chips carry Charged for operating voltage, and to the storage capacitor；When electric under the electronic equipment, the diode is in the conduction state, and the storage capacitor passes through the diode and institute Discharged in the loop for stating first resistor formation.
- 5. shock-wave noise preventing circuit according to claim 4, it is characterised in that the first resistor is connected to the second switch Between the anode of the output end of circuit and the diode, or, the first resistor is connected to the second switch circuit Between output end and the voltage source.
- 6. shock-wave noise preventing circuit according to claim 2, it is characterised in that the output end of the master chip connects through second resistance It is connected to the base stage of first triode.
- 7. shock-wave noise preventing circuit according to claim 2, it is characterised in that the voltage source is connected to described through 3rd resistor The colelctor electrode of first triode.
- 8. shock-wave noise preventing circuit according to claim 3, it is characterised in that the output end of the first switch circuit is through the 4th Resistance is connected to the base stage of second triode.
- 9. a kind of electronic equipment, including voltage source, master chip and power amplifier chips, it is characterised in that the electronic equipment also wraps Include the shock-wave noise preventing circuit as any one of claim 1 to 8；The shock-wave noise preventing circuit is connected between the output end of the master chip and the control terminal of the power amplifier chips；First switch circuit and second switch circuit in the shock-wave noise preventing circuit connect the voltage source respectively；The input of first switch circuit in the shock-wave noise preventing circuit connects the output end of the master chip, the anti-sonic boom electricity The output end of second switch circuit in road connects the control terminal of the power amplifier chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720680206.2U CN206865726U (en) | 2017-06-12 | 2017-06-12 | Shock-wave noise preventing circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720680206.2U CN206865726U (en) | 2017-06-12 | 2017-06-12 | Shock-wave noise preventing circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206865726U true CN206865726U (en) | 2018-01-09 |
Family
ID=60831624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720680206.2U Active CN206865726U (en) | 2017-06-12 | 2017-06-12 | Shock-wave noise preventing circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206865726U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019029563A1 (en) * | 2017-08-10 | 2019-02-14 | 捷开通讯(深圳)有限公司 | Mute control circuit used upon power-on or power-of, control method, and audio device |
| 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 |
| CN113541616A (en) * | 2020-04-16 | 2021-10-22 | 烽火通信科技股份有限公司 | Method and system for starting radio frequency port of drive amplifier with protection function |
| CN114125660A (en) * | 2021-11-23 | 2022-03-01 | 深圳市长丰影像器材有限公司 | Audio system for eliminating startup plosive and power supply control method |
| CN116736752A (en) * | 2022-09-21 | 2023-09-12 | 荣耀终端有限公司 | Switching circuit, electronic device and electronic system |
-
2017
- 2017-06-12 CN CN201720680206.2U patent/CN206865726U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019029563A1 (en) * | 2017-08-10 | 2019-02-14 | 捷开通讯(深圳)有限公司 | Mute control circuit used upon power-on or power-of, control method, and audio device |
| US10826455B2 (en) | 2017-08-10 | 2020-11-03 | JRD Communication (Shenzhen) Ltd. | Mute control circuit used upon power-on or power-of, control method, and audio device |
| CN113541616A (en) * | 2020-04-16 | 2021-10-22 | 烽火通信科技股份有限公司 | Method and system for starting radio frequency port of drive amplifier with protection function |
| 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 |
| CN111601217B (en) * | 2020-06-12 | 2021-11-30 | 歌尔科技有限公司 | Noise processing method for audio player, audio player and storage medium |
| CN114125660A (en) * | 2021-11-23 | 2022-03-01 | 深圳市长丰影像器材有限公司 | Audio system for eliminating startup plosive and power supply control method |
| CN114125660B (en) * | 2021-11-23 | 2023-08-15 | 深圳市长丰影像器材有限公司 | Audio system for eliminating startup plosive and power supply control method |
| CN116736752A (en) * | 2022-09-21 | 2023-09-12 | 荣耀终端有限公司 | Switching circuit, electronic device and electronic system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206865726U (en) | Shock-wave noise preventing circuit and electronic equipment | |
| CN101632210B (en) | Current limit control with current limiit detector | |
| CN101826791B (en) | UVLO circuit | |
| CN106463943B (en) | Current-limiting protection circuit and electronic equipment | |
| CN106878872A (en) | A kind of peripheral circuit for eliminating noise signal | |
| CN207150798U (en) | Stereo set | |
| CN101685961B (en) | Power supply circuit of audio frequency power amplifier | |
| CN100527563C (en) | Power supply | |
| CN104270505A (en) | Mobile terminal and mobile terminal startup method | |
| CN202759580U (en) | Audio equipment and circuit for removing switching-on/off noise of audio equipment | |
| CN207603895U (en) | A kind of booting, wake-up circuit and electronic product | |
| CN103458342A (en) | Circuit eliminating shutdown POP sound of audio power amplifier | |
| CN206272332U (en) | A kind of power control circuit | |
| CN201682412U (en) | Undervoltage latch circuit | |
| CN204697033U (en) | System reset circuit and electronic equipment | |
| CN108199446B (en) | Circuit and soft start equipment are protected in lithium battery trickle charge | |
| CN206313977U (en) | Plosive cancellation element and power amplifier | |
| CN105700983B (en) | A kind of judgment method of USBKey and USBKey operating mode | |
| CN203661276U (en) | A mute control circuit | |
| CN209134297U (en) | A kind of starting control circuit | |
| CN208509218U (en) | A kind of wireless headset with function of power protection | |
| CN207070425U (en) | Speech controling switch device | |
| CN103179458B (en) | A kind of Set Top Box and antenna supply module thereof | |
| CN207995245U (en) | The start control circuit and television set of television set | |
| CN206226401U (en) | A kind of delay protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |