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Suppression circuit for sound noise

A noise suppression and sound technology, applied in the direction of transducer circuit, electrical components, pulse processing, etc., can solve the problem that the noise cannot be suppressed, and achieve the effect of suppressing the sound noise

Inactive Publication Date: 2010-01-20
CHUNGHWA PICTURE TUBES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Similarly, at the initial stage of the voltage drop period when the voltage source V_PAMP is turned off, since the voltage of the emitter of the transistor T1 is lower than the voltage of the base, the noise cannot be suppressed and the speaker 14 emits such figure 2 Airburst noise shown in middle block 22

Method used

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  • Suppression circuit for sound noise
  • Suppression circuit for sound noise
  • Suppression circuit for sound noise

Examples

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Embodiment Construction

[0040] For the convenience of description of the embodiment, the following first pull-down switch takes a P-channel metal oxide semiconductor (PMOS) field effect transistor as an example, and the first control switch takes an N-channel metal oxide semiconductor (NMOS) field effect transistor as an example, and The second pull-down switch and the second control switch take an NPN dual-carrier junction transistor (BJT) as an example. In addition, the power amplifier is taken as an example for the post-stage amplifier.

[0041] image 3 It is a circuit diagram of an audio system using an embodiment of the acoustic noise suppression circuit of the present invention. Please refer to image 3 The sound system 30 includes a sound signal generator 31, a pre-amplifier 32, a power amplifier 33, a speaker 34, and a sound noise suppression circuit 35. Among them, the sound signal generator 31 is, for example, a microphone, a CD / VCD / DVD player or an AM / FM tuner, which is used to generate the...

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Abstract

In the sound noise suppression circuit, the output end to the front amplifier, and the input end to the back amplifier are connected electrically as common node. Power of the front amplifier is supplied by second voltage source. The noise suppression circuit includes first and second pulldown switches, first control switch, and voltage detection circuit. In period between time of starting up second voltage source and initial stages of stable voltage, the first pulldown switch guides noise to ground through the front amplifier. In period between time of starting up second voltage source and later stage of stable voltage, the second pulldown switch guides noise to ground through the front amplifier. Using voltage detection circuit detects whether voltage is stabilized in order to decide whether to make the sound noise suppression circuit fail, and to let sound signal send to the back amplifier from the front amplifier.

Description

Technical field [0001] The present invention relates to a sound noise suppression circuit, and more particularly to a sound noise suppression circuit when the power is turned on and off. Background technique [0002] figure 1 It is a circuit diagram of an audio system using a traditional sound noise suppression circuit. Please refer to figure 1 The sound system 10 includes a sound signal generator 11, a pre-amplifier 12, a power amplifier 13, a speaker 14 and a sound noise suppression circuit 15. Among them, the audio signal generator 11 is, for example, a microphone, a CD / VCD / DVD player or an AM / FM tuner, which is used to generate the audio signal Audio1. The pre-amplifier 12 is powered by the voltage source V_PAMP to receive and amplify the audio signal Audio1, and the capacitor C3 can prevent the voltage source V_PAMP from sending the pre-amplifier 12 from changing too much. The power amplifier 13 is powered by the voltage source V_PWR to receive and increase the ability of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/1254H04R3/00
Inventor 米正光王士源
Owner CHUNGHWA PICTURE TUBES LTD