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Audio ground loop noise suppression system and method

A noise suppression and ground loop technology, which is applied in the field of audio ground loop noise suppression and audio ground loop noise suppression system, can solve the problems of high cost and large volume, and achieve low cost, small design volume and simple circuit structure Effect

Active Publication Date: 2019-01-29
QINGDAO GOERTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present application provides a small and low-cost ground loop noise suppression circuit by providing an audio ground loop noise suppression system and method, which solves the problem of volume in the prior art when audio transformers are used to eliminate ground loop noise. technical problem with high cost

Method used

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  • Audio ground loop noise suppression system and method
  • Audio ground loop noise suppression system and method

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Embodiment 1

[0037] Below to Figure 6 As an example, a monophonic audio loop noise suppression system will be described in detail. In this system, the noise cancellation circuit is a differential amplifier circuit, which specifically includes a first operational amplifier U1, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4; Figure 4 , one end of the first resistor R1 is the first input end 61 of the noise canceling circuit 6 ( Figure 6 middle point A), the other end of the first resistor R1 is connected to the inverting input end of the first operational amplifier U1; one end of the second resistor R2 is the second input end 62 of the noise canceling circuit 6 ( Figure 6 middle point B), the other end of the second resistor R2 is connected to the non-inverting input end of the first operational amplifier U1; one end of the third resistor R3 is connected to the inverting input end of the first operational amplifier U1, and the other end of the th...

Embodiment 2

[0048] Such as Figure 8 As shown, it is another specific application embodiment of the noise canceling circuit in the embodiment of the present application. The noise canceling circuit 6 includes a third operational amplifier U3, a fourth operational amplifier U4, a ninth resistor R9, a tenth resistor R10, a tenth resistor One resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14 and the fifteenth resistor R15; one end of the ninth resistor R9 is the first input end 61 of the noise canceling circuit 6 (point A in the figure ), the other end of the ninth resistor R9 is connected to the inverting input end of the third operational amplifier U3; one end of the tenth resistor R10 is connected to the inverting input end of the third operational amplifier U3, and the other end of the tenth resistor R10 is connected to the eleventh One end of the resistor R11, the other end of the eleventh resistor R11 is connected to the inverting input te...

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Abstract

The invention provides an audio ground loop noise inhibiting system and method, and provides a ground loop noise inhibiting circuit which is small in size and low in cost. The system comprises an audio playing device, an audio receiving device, and an audio line for connecting the audio playing device with the audio receiving device; the audio receiving device comprises a noise counteracting circuit and a balancing circuit; the audio line comprises a first audio signal line and an audio ground line, wherein the first audio signal line is connected with the first input end of the noise counteracting circuit; the audio ground line is connected with the second input end of the noise counteracting circuit; the second input end of the noise counteracting circuit is connected to the balancing circuit, relative to the ground. According to the system, the balancing circuit is used for balancing the impedance of the audio ground line according to the equivalence so as to convert the loop noise into common-mode noise to be inputted to the noise counteracting circuit, the noise counteracting circuit can inhibit the common-mode noise and outputs the audio signal without the ground loop noise. With the adoption of the system, the technical problem of large size and high cost of removing ground loop noise by the audio transformer in the prior art can be solved.

Description

technical field [0001] The present invention relates to the technical field of audio noise elimination, in particular to an audio loop noise suppression system and an audio loop noise suppression method based on the audio loop noise suppression system. Background technique [0002] In an audio playback system, there is usually a situation where two audio devices are interconnected through an audio cable, for example, an audio player is connected to an earphone, an audio power amplifier is connected to a speaker, and the like. [0003] Such as figure 1 As shown, when the audio device 1 and the audio device 2 are interconnected through the audio line 3, there is a potential difference Vn in the ground potential between the audio device 1 and the audio device 2; noise current will be superimposed on the audio line 3 between the two Inoise, this noise current will form ground loop noise in the audio equipment 2. [0004] Solutions to ground loop noise in the prior art, such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00H03F3/45
Inventor 张金国
Owner QINGDAO GOERTEK