CN201846466U - USB loudspeaker box having function of eliminating low frequency noise - Google Patents
USB loudspeaker box having function of eliminating low frequency noise Download PDFInfo
- Publication number
- CN201846466U CN201846466U CN2010202623184U CN201020262318U CN201846466U CN 201846466 U CN201846466 U CN 201846466U CN 2010202623184 U CN2010202623184 U CN 2010202623184U CN 201020262318 U CN201020262318 U CN 201020262318U CN 201846466 U CN201846466 U CN 201846466U
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- audio
- low frequency
- power supply
- power amplifier
- usb
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Abstract
The utility model relates to a USB loudspeaker box having a function of eliminating low frequency noise. The USB loudspeaker box comprises a DC power supply, a filter capacitor, a power supply switch, an audio power amplifier, a sound volume potential controller, an audio signal input terminal as well as a horn connected with the audio power amplifier, which are sequentially connected. The DC power supply supplies the audio power amplifier with power through the filter capacitor and the power supply switch sequentially. After receiving audio signals, the audio signal input terminal outputs the audio signals to the horn through the sound volume potential controller and the audio power amplifier. The USB loudspeaker box also comprises a low frequency filter inductor which is connected between the DC power supply and the audio power amplifier. Low frequency noise in the USB power supply is filtered through connecting the low frequency inductor at the front end of the audio power amplifier in series, so that sound is more exquisite and clear when music is played. Besides, the series connection of the low frequency inductor can also prevent consuming oversize current and damaging the computer USB power supply when large dynamic music is played.
Description
Technical field
The utility model relates to electronic technology field, relates in particular to a kind of USB sound equipment of eliminating the low frequency noise function that has.
Background technology
At present, the USB sound equipment is with the power supply of computer USB power supply, because have the low frequency noise in the USB power supply, this low frequency noise can directly directly interfere with audio-frequency power amplifier from the amplifier power supply end and must export, the noise that loudspeaker output people ear can be heard when making after the start of USB sound equipment plus music signal not.
Solving the present used conventional method of USB sound equipment background noise problem has: strengthen power filtering capacitor, prime increases noise reduction IC etc.But, strengthen power filtering capacitor, not too obvious to the effect that suppresses background noise, and the electric capacity volume is excessive can't be applied in the less sound equipment of ID volume.Prime increases noise reduction IC (increasing the common mode differential amplifier circuit in the audio signal input end prime), and the method is fine to the effect that suppresses background noise, but causes electrical index signal to noise ratio to have only 35dB because the ground of signal source can not be connected with the ground of power amplifier.
In sum, a kind of USB sound equipment that can eliminate the low frequency noise of industry active demand.
The utility model content
At above-mentioned the problems of the prior art, the utility model need solve provides a kind of USB sound equipment that can eliminate the low frequency noise.
For solving the problems of the technologies described above, the utility model provides a kind of USB sound equipment of eliminating the low frequency noise function that has, and it comprises DC power supply, filter capacitor, mains switch, audio-frequency power amplifier, volume potentiometric controller, audio signal input end that connects successively and the loudspeaker that link to each other with described audio-frequency power amplifier; Described DC power supply is powered to audio-frequency power amplifier by filter capacitor, mains switch successively; Export to described loudspeaker by volume potentiometric controller and audio-frequency power amplifier behind the sub-received audio signal of described audio signal input end; It also comprises the filter inductance that is connected between described DC power supply and the audio-frequency power amplifier.
As a kind of improvement with USB sound equipment of eliminating the low frequency noise function of the utility model, described filter inductance is the low frequency filtering inductance.
Power to audio-frequency power amplifier again behind the low frequency noise in the power supply front end serial connection low frequency inductance filtering USB power supply that the utility model passes through at audio-frequency power amplifier, thereby the standby noise of sound equipment is eliminated, sound is graceful more clear during playing back music, and the power supply front end of the audio-frequency power amplifier serial connection low frequency inductance excessive damage computer USB of current sinking power supply can avoid big dynamically music again the time.
Description of drawings
Fig. 1 has the USB sound equipment structural representation in one embodiment of eliminating the low frequency noise function for the utility model is a kind of.
Fig. 2 has the USB sound equipment partial circuit figure in one embodiment that eliminates the low frequency noise function for the utility model is a kind of.
Fig. 3 has the USB sound equipment partial circuit figure in one embodiment that eliminates the low frequency noise function for the utility model is a kind of.
Embodiment
With reference to figure 1-3, a kind of embodiment with USB sound equipment of eliminating the low frequency noise function of the utility model is described, at first with reference to figure 1, the sound equipment in the present embodiment comprises DC power supply 10, low frequency filtering inductance 20, low frequency filtering electric capacity 30, mains switch 40, audio-frequency power amplifier 50, volume potentiometric controller 60, audio signal input end 70 that connects successively and the loudspeaker 80 that link to each other with the signal output part of described audio-frequency power amplifier 50.
Described DC power supply 10 is the DC5 volt, is generally the power supply of computer USB power supply.This electric current is successively by 20 filtering of low frequency filtering inductance, and filter capacitor 30 filtering are connected power supply by mains switch 40 with the power supply front end of audio-frequency power amplifier 50 again.Also be connected with power supply indicator 90 on the described mains switch, be used to indicate power supply normally whether.
Described audio signal input end 70 connects the external audio source signal, and links to each other with audio-frequency power amplifier 50 signal input parts by volume potentiometric controller 60.The audio signal that receives is exported to described loudspeaker 80 by volume potentiometric controller 60 and audio-frequency power amplifier 50.Described volume potentiometric controller 60 can be regulated the power of control audio power amplifier 50 output signals, thus the size of control loudspeaker 80 output volumes.
Because have the low frequency noise in the USB power supply, this low frequency noise can directly interfere with audio-frequency power amplifier and must export, loudspeaker can be exported noise when making the USB sound equipment start shooting not the plus music signal.Present embodiment is powered to audio-frequency power amplifier by be connected in series the low frequency noise in the low frequency inductance filtering USB power supply at audio-frequency power amplifier power supply front end after again, thereby the standby noise of sound equipment is eliminated, and sound is graceful more clear during playing back music.The excessive damage computer USB of current sinking power supply when the power supply front end of sound equipment audio-frequency power amplifier serial connection low frequency inductance can be avoided big dynamically music again.
With reference to figure 2, this figure is described DC power supply, low frequency filtering inductance, low frequency filtering electric capacity, mains switch physical circuit figure in embodiment of the utility model.This DC power supply is USB 5V DC IN, is the input of USB working power.This input is connected in series a low frequency inductance L 1, is parallel with electrochemical capacitor C26 and capacitor C 27 between No. 2 terminals of low frequency inductance L 1 and ground, and this capacitor C 26 and capacitor C 27 strobe.No. 2 terminal places of low frequency inductance L 1 switch SW 1 of connecting simultaneously, and at the two ends of switch SW 1 shunt capacitance C55, switch SW 1 is used to control the connecting and disconnecting of VCC power supply, capacitor C 55 is used to improve the mild switch motion waveform of switching speed, the other end of switch is connected in the VCC power supply end is provided, provide end to be connected with a current-limiting resistance R16 at the VCC power supply, between resistance R 16 and ground, be connected in series a LED 1, be used to indicate the VCC power supply.
Fig. 3 is described audio-frequency power amplifier, volume potentiometric controller, audio signal input end and loudspeaker physical circuit figure in embodiment of the utility model, and concrete annexation can be referring to this accompanying drawing.
Above-described the utility model execution mode does not constitute the qualification to the utility model protection range.Any modification of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the claim protection range of the present utility model.
Claims (3)
1. one kind has the USB sound equipment of eliminating the low frequency noise function, and it comprises DC power supply, filter capacitor, mains switch, audio-frequency power amplifier, volume potentiometric controller, audio signal input end that connects successively and the loudspeaker that link to each other with described audio-frequency power amplifier; Described DC power supply is powered to audio-frequency power amplifier by filter capacitor, mains switch successively; Export to described loudspeaker by volume potentiometric controller and audio-frequency power amplifier behind the sub-received audio signal of described audio signal input end; It is characterized in that it also comprises the filter inductance that is connected between described DC power supply and the audio-frequency power amplifier.
2. a kind of USB sound equipment of eliminating the low frequency noise function that has as claimed in claim 1 is characterized in that described filter inductance is the low frequency filtering inductance.
3. a kind of USB sound equipment of eliminating the low frequency noise function that has as claimed in claim 1 is characterized in that described low frequency filtering inductance is connected between described DC power supply and the filter capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202623184U CN201846466U (en) | 2010-07-16 | 2010-07-16 | USB loudspeaker box having function of eliminating low frequency noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202623184U CN201846466U (en) | 2010-07-16 | 2010-07-16 | USB loudspeaker box having function of eliminating low frequency noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201846466U true CN201846466U (en) | 2011-05-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202623184U Expired - Fee Related CN201846466U (en) | 2010-07-16 | 2010-07-16 | USB loudspeaker box having function of eliminating low frequency noise |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201846466U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108458468A (en) * | 2018-06-19 | 2018-08-28 | 奥克斯空调股份有限公司 | A kind of denoising device and air conditioner |
-
2010
- 2010-07-16 CN CN2010202623184U patent/CN201846466U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108458468A (en) * | 2018-06-19 | 2018-08-28 | 奥克斯空调股份有限公司 | A kind of denoising device and air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110525 Termination date: 20180716 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |