CN102081960A - Sonic boom-eliminating circuit - Google Patents
Sonic boom-eliminating circuit Download PDFInfo
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- CN102081960A CN102081960A CN2009103105841A CN200910310584A CN102081960A CN 102081960 A CN102081960 A CN 102081960A CN 2009103105841 A CN2009103105841 A CN 2009103105841A CN 200910310584 A CN200910310584 A CN 200910310584A CN 102081960 A CN102081960 A CN 102081960A
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Abstract
The invention provides a sonic boom-eliminating circuit which is used for eliminating sonic boom for an electronic device. The sonic boom-eliminating circuit comprises an audio-playing circuit. The audio-playing circuit comprises a digital processor, a coupling capacitance and an audio player, wherein the digital processor is used for outputting audio signals, and the coupling capacitor is connected between the digital processor and the audio player. The sonic boom-eliminating circuit also comprises a controller and an initialization circuit, wherein the controller comprises a control terminal and an output terminal, the control terminal is connected to the digital processor, the output terminal is used for outputting a first controlled level on the circuit between the coupling capacitor and the audio player when a kickback voltage is generated as the electronic device is turned on or off; and the initialization circuit comprises a first electronic switch which is conducted under the control of a controlling level output by the controller so as to lead the voltage on the circuit between the digital processor and the coupling capacitor to the ground, thereby eliminating the sonic boom. The sonic boom-eliminating circuit in the invention is low in cost.
Description
Technical field
The present invention relates to a kind of sonic boom and eliminate circuit.
Background technology
Current audio-frequence player device, portable playback device such as mobile phone, MP3 player particularly, the general normal moment that has the power switch machine produces the problem of sonic boom, and its main cause is the moment of switching on and shutting down, impacts audio player because voltage jump produces burst current.
Yet present most sonic boom is eliminated circuit and is adopted integrated chip to carry out the sonic boom elimination mostly, as MAX9890.This integrated chip price comparison costliness has increased the cost that sonic boom is eliminated circuit greatly.
Summary of the invention
In view of this, be necessary to provide the low sonic boom of a kind of cost to eliminate circuit.
A kind of sonic boom is eliminated circuit, and it is used to an electronic installation to eliminate sonic boom.Described audio playing circuit comprises that a digital processing unit, an audio player and are coupled in the coupling capacitance between described digital processing unit and the audio player.Described digital processing unit is used for output audio signal.Described coupling capacitance is used for exporting the sound signal coupling of digital processing unit output to audio player.Described audio player is used for converting sound signal to voice signal and plays.This sonic boom is eliminated circuit and is also comprised a controller, an initializing circuit.Described controller comprises a control end and an output terminal.Described control end is connected to described digital processing unit.Described output terminal is used on the circuit between described coupling capacitance and described audio player because one first control level is exported in electronic installation start just or shutdown when producing leaping voltage.Described initializing circuit comprises one first electronic switch, and described first electronic switch comprises first control end, the first electronics end and the second electronics end.Described first control end is used to control conducting and the disconnection between the first electronics end and the second electronics end.First control end of described first electronic switch is connected to the output terminal of described controller.The first electronics end of described first electronic switch is connected to the input end of described audio player.The second electronics end ground connection of described first electronic switch.First control end of described first electronic switch is controlled the described first electronic switch conducting when receiving described first control level.Voltage on the circuit between described coupling capacitance and the described audio player flow to ground via the first electronics end and the second electronics end of described first electronic switch, to eliminate the sonic boom phenomenon.
Compared to prior art, when described sonic boom elimination circuit can be eliminated the firm start of electronic installation or normal shutdown or abnormal power-down by described initializing circuit, because the sonic boom that the voltage on the circuit between described coupling capacitance and the described audio player produces owing to saltus step.Eliminate thereby need not to adopt integrated chip to carry out sonic boom, reduced the cost of sonic boom elimination circuit.
Description of drawings
Fig. 1 is the circuit diagram that the sonic boom that provides of better embodiment of the present invention is eliminated circuit.
Embodiment
Below with reference to the drawings, the present invention is described in further detail.
See also Fig. 1, eliminate circuit 100 for the sonic boom that better embodiment of the present invention provides, it can be used in some electronic installations such as mobile phone, MP4, digital camera.In the present embodiment, described electronic installation is digital camera (figure does not show).This sonic boom is eliminated the audio playing circuit 10 that circuit 100 connects digital camera, the sonic boom phenomenon when being used to eliminate the digital camera switching on and shutting down.This sonic boom is eliminated circuit 100 and is comprised a controller 15, an initializing circuit 20 and a holding circuit 30.
Described audio playing circuit 10 comprises that a digital processing unit 11, an audio player 12 and are coupled in the coupling capacitance C between described digital processing unit 11 and the audio player 12.Described digital processing unit 11 is used for output audio signal.Described coupling capacitance C is used for exporting the sound signal coupling of digital processing unit 11 outputs to audio player 12.Described audio player 12 is used for converting sound signal to voice signal and plays.
Described controller 15 comprises a control end 150 and an output terminal 151.Described control end 150 is connected to described digital processing unit 11.Described output terminal 151 is used to export one first control level to described initializing circuit 20.In the present embodiment, described first control level is a high level.Be understandable that described controller 15 can be two separate elements with described digital processing unit 11, also controller 15 directly can be integrated on the described digital processing unit 11, is not limited to present embodiment.In the present embodiment, the central processing unit that controller 15 adopts in the digital camera.
Described initializing circuit 20 comprises one first resistance R and one first electronic switch Q1.The described first electronic switch Q1 comprises one first control end, one first electronics end and one second electronics end.Described first control end is used to control conducting and the disconnection between the first electronics end and the second electronics end.In the present embodiment, the described first electronic switch Q1 is a NPN type triode, and the base stage B of described triode, collector C and emitter E constitute first control end, the first electronics end and the second electronics end of the first electronic switch Q1 respectively.First control end of the described first electronic switch Q1 is connected to the output terminal 151 of described controller 15 by described first resistance R, and the first electronics end of the described first electronic switch Q1 is connected to the input end of described audio player 12.The second electronics end ground connection of the described first electronic switch Q1.
Described holding circuit 30 comprises a battery 31, one second electronic switch Q2, a reset circuit 32 and one second resistance R 2.In the present embodiment, described battery 31 is the clock battery in the described digital camera.The described second electronic switch Q2 comprises one second control end, the 3rd electronics end and quadrielectron end.Described second control end is used to control conducting and the disconnection between the 3rd electronics end and the quadrielectron end.In the present embodiment, the described second electronic switch Q2 is a positive-negative-positive triode, and the base stage B of described triode, collector C and emitter E constitute second control end, the 3rd electronics end and the quadrielectron end of the second electronic switch Q2 respectively.Second control end of the described second electronic switch Q2 is connected to the output terminal of described reset circuit 32 by described second resistance R 2, and the 3rd electronics end of the described second electronic switch Q2 is connected the output terminal 151 of described controller 15.The quadrielectron end of the described second electronic switch Q2 is connected to the output terminal of described clock battery 31.Described reset circuit 32 is used to export one second control level.In the present embodiment, described reset circuit 32 is the chip that resets in the digital camera, and second control level of described reset circuit 32 outputs is a low level.
When being integrated with the digital camera start of described sonic boom elimination circuit 100, described controller 15 is opened digital processing unit 11 and is sent sound signal for the previous period, as 10 milliseconds, first control end of output terminal 151 outputs one first control level to the first electronic switch Q1 of described controller 15, this first control level is impelled the first electronic switch Q1 conducting.On the circuit between described coupling capacitance C and the described audio player 12 because the leaping voltage that digital camera has produced when just having started shooting flow to ground via the described first electronic switch Q1.To eliminate the sonic boom that firm when start produces.A period of time after described controller 15 is opened digital processing unit 11 to send sound signal, as 10 milliseconds, the output terminal 151 of described controller 15 stops to export first control level, and the described first electronic switch Q1 ends.The sound signal of described digital processing unit 11 outputs is coupled to described audio player 12 through coupling capacitance C and plays.
When digital camera shuts down, similarly, described controller 15 cuts out digital processing unit 11 and sends sound signal for the previous period, as 10 milliseconds, described first control level of output terminal 151 outputs of described controller 15, this first control level is impelled the first electronic switch Q1 conducting.On the circuit between described coupling capacitance C and the described audio player 12 because the leaping voltage that digital camera has produced when just having shut down flow to ground via the described first electronic switch Q1, the sonic boom of generation when eliminating the electronic installation shutdown.
When the digital camera abnormal power-down, one output pin of described reset circuit 32 is exported second control end of second control level to the second electronic switch Q2, the described second electronic switch Q2 conducting, described clock battery 31 output high level cause the first electronic switch Q1 conducting through first control end that the second electronic switch Q2 flow to the first electronic switch Q1.Because digital processing unit 11 has just stopped the moment of output audio signal, voltage between described coupling capacitance C and the described audio player 12 is owing to the sonic boom that saltus step produces flow to ground via the described first electronic switch Q1, the sonic boom that produces when eliminating electronic installation generation abnormal power-down.
When described sonic boom is eliminated circuit and can be eliminated electronic installation start just or normal shutdown by described initializing circuit, because the sonic boom that the voltage on the circuit between described coupling capacitance and the described audio player produces owing to saltus step.In the time of also can eliminating the electronic installation abnormal power-down, because digital processing unit has just stopped the moment of output audio signal, the sonic boom that the voltage on the circuit between described coupling capacitance and the described audio player produces owing to saltus step by described holding circuit.Eliminate owing to need not to adopt integrated chip to carry out sonic boom, reduced sonic boom and eliminated the circuit design cost.
Be understandable that, for the person of ordinary skill of the art, can make other various corresponding changes and distortion by technical conceive according to the present invention, and all these change the protection domain that all should belong to claim of the present invention with distortion.
Claims (10)
1. a sonic boom is eliminated circuit, it is used to an electronic installation to eliminate sonic boom, described audio playing circuit comprises a digital processing unit, one audio player and one is coupled in the coupling capacitance between described digital processing unit and the audio player, described digital processing unit is used for output audio signal, described coupling capacitance is used for exporting the sound signal coupling of digital processing unit output to audio player, described audio player is used for converting sound signal to voice signal and plays, it is characterized in that: also comprise a controller, one initializing circuit, described controller comprises a control end and an output terminal, described control end is connected to described digital processing unit, described output terminal is used on the circuit between described coupling capacitance and described audio player because one first control level is exported in electronic installation start just or shutdown when producing leaping voltage, described initializing circuit comprises one first electronic switch, described first electronic switch comprises first control end, the first electronics end and the second electronics end, described first control end is used to control conducting and the disconnection between the first electronics end and the second electronics end, first control end of described first electronic switch is connected to the output terminal of described controller, the first electronics end of described first electronic switch is connected to the input end of described audio player, the second electronics end ground connection of described first electronic switch, first control end of described first electronic switch is when receiving described first control level, control the described first electronic switch conducting, voltage on the circuit between described coupling capacitance and the described audio player flow to ground via the first electronics end and the second electronics end of described first electronic switch, to eliminate the sonic boom phenomenon.
2. sonic boom as claimed in claim 1 is eliminated circuit, it is characterized in that: described first electronic switch is a NPN type triode, and the base stage of described triode, collector and emitter constitute first control end, the first electronics end and the second electronics end of first electronic switch respectively.
3. sonic boom as claimed in claim 2 is eliminated circuit, and it is characterized in that: described first control level is a high level.
4. sonic boom as claimed in claim 1 is eliminated circuit, it is characterized in that: described just as change circuit and also comprise one first resistance, described first resistance is connected between first output terminal of first control end of described first switching tube and described controller.
5. sonic boom as claimed in claim 2 is eliminated circuit; it is characterized in that: described sonic boom is eliminated circuit and is also comprised a holding circuit; described holding circuit comprises a battery; one second electronic switch and a reset circuit; described second electronic switch comprises one second control end; the 3rd electronics end and quadrielectron end; described second control end is used to control conducting and the disconnection between the 3rd electronics end and the quadrielectron end; second control end of described second electronic switch is connected to an output terminal of described reset circuit; the 3rd electronics end of described second electronic switch is connected between first control end of first output terminal of described controller and first electron tube, and the quadrielectron end of described second electronic switch is connected to the output terminal of described clock battery.
6. sonic boom as claimed in claim 5 is eliminated circuit, it is characterized in that: when the electronic installation abnormal power-down, described reset circuit is exported second control end of one second control level to the second electronic switch, the described second electronic switch conducting, described clock battery output high level flow to first control end of first electronic switch through second electronic switch, cause the first electronic switch conducting, voltage between described coupling capacitance and the described audio player flow to ground via described first electronic switch, to eliminate the sonic boom phenomenon.
7. sonic boom as claimed in claim 5 is eliminated circuit, it is characterized in that: described second electronic switch is a positive-negative-positive triode, and the base stage of described triode, collector and emitter constitute second control end, the 3rd electronics end and the quadrielectron end of second electronic switch respectively.
8. sonic boom as claimed in claim 6 is eliminated circuit, and it is characterized in that: described second control level is a low level.
9. sonic boom as claimed in claim 6 is eliminated circuit, it is characterized in that: described battery is the clock battery in the described electronic installation, and described reset circuit is the chip that resets in the electronic installation.
10. sonic boom as claimed in claim 6 is eliminated circuit, and it is characterized in that: described holding circuit further comprises one second resistance, and second control end of described second electronic switch is connected to the output terminal of described reset circuit by described second resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103105841A CN102081960A (en) | 2009-11-27 | 2009-11-27 | Sonic boom-eliminating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103105841A CN102081960A (en) | 2009-11-27 | 2009-11-27 | Sonic boom-eliminating circuit |
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| CN102081960A true CN102081960A (en) | 2011-06-01 |
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| CN2009103105841A Pending CN102081960A (en) | 2009-11-27 | 2009-11-27 | Sonic boom-eliminating circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104363547A (en) * | 2014-12-04 | 2015-02-18 | 青岛歌尔声学科技有限公司 | Audio processing circuit for eliminating plug-in noise of earphone and line control earphone |
| CN105024674A (en) * | 2015-03-13 | 2015-11-04 | 苏州迈瑞微电子有限公司 | Asynchronous resetting device |
| CN105263087A (en) * | 2015-11-18 | 2016-01-20 | 广东威创视讯科技股份有限公司 | Audio output circuit capable of eliminating startup and shutdown impact sound |
| CN106936972A (en) * | 2015-12-30 | 2017-07-07 | 小米科技有限责任公司 | Control method, the apparatus and system of voice-frequency channel |
| WO2023093684A1 (en) * | 2021-11-23 | 2023-06-01 | 深圳市长丰影像器材有限公司 | Audio system for eliminating turn-on pop noise and power supply control method |
-
2009
- 2009-11-27 CN CN2009103105841A patent/CN102081960A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104363547A (en) * | 2014-12-04 | 2015-02-18 | 青岛歌尔声学科技有限公司 | Audio processing circuit for eliminating plug-in noise of earphone and line control earphone |
| CN104363547B (en) * | 2014-12-04 | 2017-09-26 | 青岛歌尔声学科技有限公司 | Audio frequency processing circuit and line control earphone for eliminating headset plugging noise |
| CN105024674A (en) * | 2015-03-13 | 2015-11-04 | 苏州迈瑞微电子有限公司 | Asynchronous resetting device |
| CN105024674B (en) * | 2015-03-13 | 2018-06-12 | 苏州迈瑞微电子有限公司 | A kind of asynchronous reset |
| CN105263087A (en) * | 2015-11-18 | 2016-01-20 | 广东威创视讯科技股份有限公司 | Audio output circuit capable of eliminating startup and shutdown impact sound |
| CN105263087B (en) * | 2015-11-18 | 2020-01-10 | 广东威创视讯科技股份有限公司 | Audio output circuit for eliminating startup and shutdown impact sound |
| CN106936972A (en) * | 2015-12-30 | 2017-07-07 | 小米科技有限责任公司 | Control method, the apparatus and system of voice-frequency channel |
| WO2023093684A1 (en) * | 2021-11-23 | 2023-06-01 | 深圳市长丰影像器材有限公司 | Audio system for eliminating turn-on pop noise and power supply control method |
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Application publication date: 20110601 |