A circuit for eliminating the pop sound when the audio power amplifier is turned off

An audio and circuit technology is applied in the field of circuits for eliminating the POP sound when the audio power amplifier is turned off.

Active Publication Date: 2016-08-17
SHANGHAI BEILING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a circuit for eliminating the POP sound when the audio power amplifier is turned off, which can solve the problem that the traditional audio system cannot eliminate the POP sound when the audio power amplifier is turned off

Method used

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  • A circuit for eliminating the pop sound when the audio power amplifier is turned off
  • A circuit for eliminating the pop sound when the audio power amplifier is turned off
  • A circuit for eliminating the pop sound when the audio power amplifier is turned off

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Embodiment Construction

[0025] see Figure 2 to Figure 4 In order to better understand the technical solution of the present invention, the inventors of the present invention will describe in detail below through specific embodiments in conjunction with the accompanying drawings:

[0026] see figure 2 and image 3 , an embodiment of the present invention, a circuit for eliminating the POP sound of an audio power amplifier shutdown, connected to an audio system, the audio system includes a power supply 1, a DC / DC converter 2, a main chip 3 and a pair of audio power amplifiers 4, a power supply 1, a DC / DC The DC converter 2 is connected to the main chip 3 in turn, the voltage VDD of the power supply 1 is stepped down by the DC / DC converter 2 to supply power to the main chip 3, each audio power amplifier 4 is connected to the main chip 3, and each audio power amplifier 4 is also connected to the power supply 1 connected. The DC / DC converter 2 can be replaced by an LDO voltage regulator, the power su...

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Abstract

The invention discloses a circuit for eliminating the POP sound of an audio power amplifier shutdown, comprising a first triode, a second triode, a first resistor, a second resistor, a third resistor and a fourth resistor, the first triode The base of the tube is connected to the power supply through the first resistor, the base of the first triode is grounded through the second resistor, and the collector of the first triode is connected to the third resistor The power supply of the audio system, the emitter of the first triode is grounded; the base of the second triode is connected to the collector of the first triode and the terminal of the third resistor, so The collector of the second triode is connected to the power supply through the fourth resistor, the emitter of the second triode is grounded, and the collector of the second triode and the fourth resistor The connected ends are respectively connected to a pair of audio power amplifiers of the audio system end. Its technical effect is: it can eliminate the POP sound when the audio power amplifier is turned off when the audio system is powered off.

Description

technical field [0001] The invention relates to a circuit for eliminating the POP sound of an audio power amplifier shutting down in the field of integrated circuits. Background technique [0002] POP (popping) sound refers to the popping sound produced by the audio device on the earphone or speaker due to the transient impact of various operations at the moment of power-on, power-off and power-on stability, which will be produced by the human ear in the audio range A "puff" noise. This is what users don't want to hear, and system design engineers always try to avoid it. Usually this kind of transient impact is a very narrow sharp pulse. After the Fourier analysis is unfolded, the spectral components are very rich, and the energy distribution in the frequency domain is relatively average. Our purpose is to reduce its harmonic components in the range of 20Hz to 20kHz. For most human ears, if the peak-to-peak voltage of the signal is less than 10mV, it is inaudible. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
Inventor 阮颐聂纪平
Owner SHANGHAI BEILING
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