Sound noise control circuit

A noise control and circuit technology, applied in the direction of gain control, transducer circuit, amplification control, etc., can solve the problems of poor control effect and achieve the effect of wide suitability, less parameter modification and stable effect

Inactive Publication Date: 2010-09-15
HUIZHOU DESAY SV AUTOMOTIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides an audio noise control circuit to solve the technical ...

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] The sound source is input to the power amplifier through the left and right channels of the power amplifier, and then output to the speaker after being processed by the power amplifier. The function of the Mute pin of the power amplifier is to control whether the power amplifier outputs sound to the speaker according to its high or low level. Activate the Mute pin to prohibit the power amplifier from outputting sound; release the Mute pin to allow the power amplifier to output sound. If the Mute pin is 0 level, start Mute; if the Mute pin is high level, release Mute.

[0035] When the power amplifier is powered on, it takes a while before the output terminal rises to the working reference voltage, such as figure 1 As shown, during the power-on process of the power amplifier, the output terminal is a set of positive and negati...

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Abstract

The invention relates to the technical field of sounds, in particular to a sound noise control circuit. A sound source is output to a horn after being processed by a power amplifier; the power amplifier is provided with a mute pin; the sound source is prohibited from being input to the power amplifier by starting the mute pin or the sound source is allowed to be input to the power amplifier by releasing the mute pin; a signal feedback control circuit is arranged between the mute pin and the power amplifier; and the mute pin is controlled to be started and released according to the information output by the power amplifier. The invention controls the starting and the releasing of the mute pin by monitoring the output voltage of the power amplifier as a feedback signal, and thereby, the sound POP noise is controlled; the information output by the power amplifier can be automatically detected; when the power amplifier can be operated according to the information; the power on and power off control balance point of the power amplifier is automatically found; and a comparatively simple control scheme according with the balance point is designed. The invention has simple operation, fewer parameter modification and wide fitness, can be used for different products and has stabler and more effective effect on controlling the POP noise.

Description

technical field [0001] The invention relates to the field of audio technology, in particular to an audio noise control circuit. Background technique [0002] In audio, especially in car audio, when turning on or off, a relatively obvious noise can be heard from the speaker, which is called audio POP noise. There are many kinds of POP noise control technologies, mainly around the control of the mute (Mute) pin of the power amplifier. Either through hardware circuit control, or through software control, or through the combination of software and hardware, because the combination of software and hardware is not well controlled, the control effect on POP noise is not good. [0003] In terms of product application, the existing solutions are mainly based on the development experience of engineers to control POP noise, rather than setting the control scheme completely based on the source of POP noise and the characteristics of the power amplifier itself, so there are the followin...

Claims

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Application Information

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IPC IPC(8): H04R3/00H03G3/00
Inventor 王满红王锦镇
Owner HUIZHOU DESAY SV AUTOMOTIVE
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