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Noise canceling circuit

A noise elimination and circuit technology, applied in the direction of transducer circuit, electrical components, data processing power supply, etc., can solve the problem of harsh switching noise and achieve the effect of noise elimination

Inactive Publication Date: 2013-12-18
HONG FU JIN PRECISION IND WUHAN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Since the computer power supply circuit includes many filter capacitors, when the computer is turned on or off, the voltage of the power port of the sound card must be delayed before jumping to a high level or a low level, and the sound card's channel will output irregular audio signals to the speaker, which makes harsh switching noises

Method used

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Experimental program
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Embodiment Construction

[0018] see figure 1 , in a preferred embodiment of the present invention, a noise canceling circuit 100 in a computer is connected to a voltage source through a filter 200 , and the noise canceling circuit 100 is connected to a speaker 500 through a control chip 400 . In one embodiment, the control chip 400 is a chip with a model of Realtec AC97, and the voltage source is a power supply 300 .

[0019] see figure 2 , the noise elimination circuit 100 includes a DC voltage conversion chip 10 and a switch element 20 . In one embodiment, the DC voltage conversion chip 10 is a chip with a model number of MC78L05ACDR2G, and the switching element 20 is a field effect transistor.

[0020] The voltage input pin Vin of the DC voltage conversion chip 10 is connected to the filter 200, the voltage input pin Vin of the DC voltage conversion chip 10 is also grounded through a capacitor C1, and the voltage output of the DC voltage conversion chip 10 is The pin Vout is connected to the an...

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PUM

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Abstract

A noise canceling circuit applied to a computer comprises a DC (Direct Current) voltage switching chip. The noise canceling circuit further comprises a switch element which comprises a first end, a second end and a third end; the DC voltage switching chip comprises a voltage input pin and a voltage output pin; the voltage input pin is used for connecting a first voltage source; the voltage output pin is connected to a node; the node is used for connecting a control chip which is used for controlling a loudspeaker; the node is connected to the second end of the switch element; the first end of the switch element is connected to a control end; the third end of the switch element is connected to a second voltage source.

Description

technical field [0001] The invention relates to a noise elimination circuit, in particular to a noise elimination circuit when a computer is turned on and off. Background technique [0002] Since the computer power supply circuit includes many filter capacitors, when the computer is turned on or off, the voltage of the power port of the sound card must be delayed before jumping to a high level or a low level, and the sound card's channel will output irregular audio signals to the The speaker makes harsh switching noises. Contents of the invention [0003] In view of the above, it is necessary to provide a noise canceling circuit capable of canceling the switching noise. [0004] A noise elimination circuit applied to a computer, including a DC voltage conversion chip, the noise elimination circuit also includes a switch element, the switch element includes a first terminal, a second terminal and a third terminal, The DC voltage conversion chip includes a voltage input pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/26
CPCH04R3/00H04R3/02
Inventor 王力勇
Owner HONG FU JIN PRECISION IND WUHAN CO LTD