CN205213029U - Audio system - Google Patents
Audio system Download PDFInfo
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- CN205213029U CN205213029U CN201520915274.3U CN201520915274U CN205213029U CN 205213029 U CN205213029 U CN 205213029U CN 201520915274 U CN201520915274 U CN 201520915274U CN 205213029 U CN205213029 U CN 205213029U
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- audio system
- thermistor
- bias voltage
- noise
- voltage
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- 238000004880 explosion Methods 0.000 claims abstract description 24
- 230000008859 change Effects 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 15
- 230000007423 decrease Effects 0.000 claims description 9
- 230000001934 delay Effects 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 3
- 230000001629 suppression Effects 0.000 abstract 6
- 230000005611 electricity Effects 0.000 abstract 4
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The utility model discloses an audio system, include: loudspeaker, filter capacitance, driver chip, noise suppression circuit, noise suppression circuit's input termination power supply voltage VCC, noise suppression circuit's output termination driver chip's input, driver chip's output termination filter capacitance's positive pole, filter capacitance's negative pole connects the second termination ground of the first end of loudspeaker, loudspeaker, noise suppression circuit for restrain the change that audio system went up the electricity and/or fell the intermediate -current of circuit in the twinkling of an eye of electricity, avoid offset voltage saltus step production explosion sound noise in the twinkling of an eye, wherein, offset voltage is the anodal voltage -to -ground of filter capacitance. Preferably, noise suppression circuit includes thermistor. The utility model provides an audio system in the system electricity with fall the electricity in the twinkling of an eye, the change of effective suppression circuit intermediate -current avoids producing in the twinkling of an eye the big discharge current that fills and cause the explosion sound noise, and behind the system start -up, impact systems is not normally worked, has promoted properties of product and user experience.
Description
Technical field
The utility model relates to Audiotechnica field, particularly a kind of audio system.
Background technology
The loudspeaker of single-ended drive generally adopt larger coupling capacitance in the market, and because system is mostly single power supply, therefore need to provide DC offset voltage to loudspeaker, size is the half of supply power voltage VCC, and loudspeaker are vibrated near this bias voltage.
Fig. 2 is the graph of a relation of bias voltage and noise voltage in existing single-ended drive loudspeaker, as shown in Figure 2, coupling capacitance system electrification moment positive pole bias voltage 210 can rise to 1/2VCC instantaneously, the voltage of negative pole is 0, noise voltage 220 between coupling capacitance both positive and negative polarity is 1/2VC, can produce larger charging current; Coupling capacitance system power failure moment positive pole bias voltage 210 can drop to 0 instantaneously, the voltage of negative pole is 1/2VCC, and the noise voltage 220 between coupling capacitance both positive and negative polarity is-1/2VCC, can produce larger discharging current.Therefore there will be explosion sound noise in the moment of system electrification and power down, affect the performance of product and the experience of user.
Utility model content
In order to solve existing loudspeaker in the problem that there will be explosion sound noise with the moment of power down that powers on, the utility model provides a kind of audio system, comprising: loudspeaker, filter capacitor, driving chip, noise reducing circuit; The input termination supply power voltage VCC of described noise reducing circuit;
The input of driving chip described in the output termination of described noise reducing circuit, the positive pole of filter capacitor described in the output termination of described driving chip, the negative pole of described filter capacitor connects the first end of described loudspeaker, the second end ground connection of described loudspeaker;
Described noise reducing circuit, power on for suppressing described audio system and/or power down moment electric current in circuit change, avoid bias voltage instantaneous abrupt change to produce explosion sound noise;
Wherein, described bias voltage is the voltage to earth of described filter capacitor positive pole.
Wherein, described noise reducing circuit specifically for:
When described audio system powers on, the electric current that described noise reducing circuit controls in described audio system increases gradually, delays the rising of described bias voltage, avoids described bias voltage to raise instantaneously and produces explosion sound noise;
When described audio system normally works, described noise reducing circuit does not affect the voltage of each point in described audio system;
During described audio system power down, the electric current that described noise reducing circuit controls in described audio system reduces gradually, delays the decline of described bias voltage, avoids described bias voltage to reduce instantaneously and produces explosion sound noise.
Wherein, described noise reducing circuit comprises thermistor;
Described thermistor resistance decreasing when the temperature increases, resistance becomes large when the temperature decreases;
Described in the moment that described audio system powers on, thermistor temp is lower, resistance is larger, electric current flows through the heat that described thermistor produces makes that the temperature of described thermistor raises, resistance decreasing, electric current increases gradually, delay the rising of described bias voltage, avoid described bias voltage to raise instantaneously and produce explosion sound noise;
Wherein, the temperature of described thermistor is higher, resistance is less, can not affect the voltage of each point in described audio system;
Described in the moment of described audio system power down, thermistor temp is higher, resistance is less, power down after-current flows through described thermistor generation heat to be reduced gradually, reduction resistance along with described thermistor temp becomes large, electric current reduces gradually, delay the decline of described bias voltage, avoid described bias voltage to reduce instantaneously and produce explosion sound noise.
Wherein, described thermistor is NTC thermistor.
Wherein, described bias voltage is 1/2VCC.
The beneficial effect of the utility model embodiment is: the audio system that the utility model provides is in the moment of system electrification and power down, effectively can suppress the change of electric current in circuit, avoid producing large charging and discharging currents instantaneously and cause explosion sound noise, and after system start-up, normally can not work by influential system, improve properties of product and Consumer's Experience.
Accompanying drawing explanation
The structural representation of the audio system that Fig. 1 provides for the utility model embodiment;
Fig. 2 is the graph of a relation of bias voltage and noise voltage in existing single-ended drive loudspeaker;
The graph of a relation of bias voltage and noise voltage in the audio system that Fig. 3 provides for the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model execution mode is described in further detail.
The structural representation of the audio system that Fig. 1 provides for the utility model embodiment.As shown in Figure 1, the utility model provides a kind of audio system, comprising: loudspeaker 110, filter capacitor C, driving chip 120, noise reducing circuit 130.
The input termination supply power voltage VCC of noise reducing circuit 130, the input of the output termination driving chip 120 of noise reducing circuit 130, the positive pole of the output termination filter capacitor C of driving chip 120, the negative pole of filter capacitor C connects the first end of loudspeaker 110, the second end ground connection of loudspeaker 110.
Noise reducing circuit 130, power on for suppressing audio system and/or power down moment electric current in circuit change, avoid the bias voltage instantaneous abrupt change of filter capacitor C positive pole to produce explosion sound noise.Explosion sound noise refer to audio parts powering on, shutdown transient and power on stable after, the explosion sound that the transient impact that various operation brings produces.Produce normally a kind of very narrow spike of transient impact of explosion sound noise.
The graph of a relation of bias voltage and noise voltage in the audio system that Fig. 3 provides for the utility model embodiment, bias voltage 310 is filter capacitor C positive pole voltage over the ground, and noise voltage 320 is the voltage of filter capacitor C positive pole anticathode.
As shown in Figure 3, when audio system powers on, the electric current that noise reducing circuit 130 controls in audio system increases gradually, delays the rising of bias voltage 310, avoids bias voltage 130 to raise instantaneously and produces explosion sound noise.
When audio system normally works, noise reducing circuit 130 does not affect the voltage of each point in audio system.
When audio system power down, the electric current that noise reducing circuit 130 controls in audio system reduces gradually, delays the decline of bias voltage 130, avoids bias voltage 130 to reduce instantaneously and produces explosion sound noise.
In the utility model one preferred embodiment, noise reducing circuit 130 comprises thermistor R, and thermistor R resistance diminishes when the temperature increases, and thermistor R resistance becomes large when the temperature decreases.
Power on when audio system or be switched to moment of operating state from holding state, needing to charge to filter capacitor C, therefore electric current is comparatively large, and powered on moment thermistor R is in lower temperature, and the resistance of thermistor R is comparatively large, due to P=I
2r known electric current one timing resistor is more high-power larger, and now thermistor R generates heat, and by the known temperature of thermistor characteristic, more high resistance is lower, then along with temperature raises, thermistor R resistance diminishes.In the process of electrifying startup, the resistance of thermistor R reduces gradually, and electric current raises gradually, has effectively delayed the rising of bias voltage 310, make noise voltage 320 compared with the noise voltage 220 in Fig. 2, pulse strength reduces, and pulsewidth broadens, and effectively inhibits explosion sound noise.
Audio system power down or enter moment of holding state, thermistor R temperature is higher, resistance is less, power down after-current flows through thermistor R generation heat to be reduced gradually, reduction resistance along with thermistor R temperature becomes large, electric current reduces gradually, delay the decline of bias voltage 310, avoid bias voltage 310 to reduce instantaneously and produce explosion sound noise.
When normally working after audio system starts, electric current is more stable, and thermistor R is in a higher temperature, and resistance is smaller, can not affect the voltage of audio system each point.
Preferably, thermistor R is NTC thermistor.
In sum, a kind of audio system that the utility model provides, compared with prior art, there is following beneficial effect: the audio system that the utility model provides is in the moment of system electrification and power down, effectively can suppress the change of electric current in circuit, avoid producing large charging and discharging currents instantaneously and cause explosion sound noise, and after system start-up, normally can not work by influential system, improve properties of product and Consumer's Experience.
The foregoing is only preferred embodiment of the present utility model, be not intended to limit protection range of the present utility model.All do within spirit of the present utility model and principle any amendment, equivalent replacement, improvement etc., be all included in protection range of the present utility model.
Claims (5)
1. an audio system, is characterized in that, described audio system comprises: loudspeaker, filter capacitor, driving chip, noise reducing circuit; The input termination supply power voltage VCC of described noise reducing circuit;
The input of driving chip described in the output termination of described noise reducing circuit, the positive pole of filter capacitor described in the output termination of described driving chip, the negative pole of described filter capacitor connects the first end of described loudspeaker, the second end ground connection of described loudspeaker;
Described noise reducing circuit, power on for suppressing described audio system and/or power down moment electric current in circuit change, avoid bias voltage instantaneous abrupt change to produce explosion sound noise;
Wherein, described bias voltage is the voltage to earth of described filter capacitor positive pole.
2. audio system as claimed in claim 1, is characterized in that, described noise reducing circuit specifically for:
When described audio system powers on, the electric current that described noise reducing circuit controls in described audio system increases gradually, delays the rising of described bias voltage, avoids described bias voltage to raise instantaneously and produces explosion sound noise;
When described audio system normally works, described noise reducing circuit does not affect the voltage of each point in described audio system;
During described audio system power down, the electric current that described noise reducing circuit controls in described audio system reduces gradually, delays the decline of described bias voltage, avoids described bias voltage to reduce instantaneously and produces explosion sound noise.
3. audio system as claimed in claim 2, it is characterized in that, described noise reducing circuit comprises thermistor;
Described thermistor resistance decreasing when the temperature increases, resistance becomes large when the temperature decreases;
Described in the moment that described audio system powers on, thermistor temp is lower, resistance is larger, electric current flows through the heat that described thermistor produces makes that the temperature of described thermistor raises, resistance decreasing, electric current increases gradually, delay the rising of described bias voltage, avoid described bias voltage to raise instantaneously and produce explosion sound noise;
When described audio system normally works, electric current is comparatively large, and the temperature of described thermistor is higher, resistance is less, can not affect the voltage of each point in described audio system;
Described in the moment of described audio system power down, thermistor temp is higher, resistance is less, power down after-current flows through described thermistor generation heat to be reduced gradually, reduction resistance along with described thermistor temp becomes large, electric current reduces gradually, delay the decline of described bias voltage, avoid described bias voltage to reduce instantaneously and produce explosion sound noise.
4. audio system as claimed in claim 3, it is characterized in that, described thermistor is NTC thermistor.
5. audio system as claimed in claim 1, it is characterized in that, described bias voltage is 1/2VCC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520915274.3U CN205213029U (en) | 2015-11-16 | 2015-11-16 | Audio system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520915274.3U CN205213029U (en) | 2015-11-16 | 2015-11-16 | Audio system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205213029U true CN205213029U (en) | 2016-05-04 |
Family
ID=55850714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520915274.3U Active CN205213029U (en) | 2015-11-16 | 2015-11-16 | Audio system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205213029U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231491A (en) * | 2016-08-01 | 2016-12-14 | 深圳市福智软件技术有限公司 | The method of power down POP sound is extracted in a kind of elimination |
| CN109922394A (en) * | 2017-12-13 | 2019-06-21 | 华为终端有限公司 | Bias voltage output circuit and driving circuit |
-
2015
- 2015-11-16 CN CN201520915274.3U patent/CN205213029U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106231491A (en) * | 2016-08-01 | 2016-12-14 | 深圳市福智软件技术有限公司 | The method of power down POP sound is extracted in a kind of elimination |
| CN106231491B (en) * | 2016-08-01 | 2017-10-27 | 深圳市福智软件技术有限公司 | It is a kind of to eliminate the method for extracting power down POP sound |
| CN109922394A (en) * | 2017-12-13 | 2019-06-21 | 华为终端有限公司 | Bias voltage output circuit and driving circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240524 Address after: 266104 No. 500, Songling Road, Laoshan District, Qingdao, Shandong Patentee after: GOERTEK TECHNOLOGY Co.,Ltd. Country or region after: China Address before: 266061 5, 3 building, Fortune Plaza, 18 Qinling Mountains Road, Laoshan District, Qingdao, Shandong. Patentee before: QINGDAO GOERTEK TECHNOLOGY Co.,Ltd. Country or region before: China |
|
| TR01 | Transfer of patent right |