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Shock-wave noise preventing circuit

A circuit and sonic explosion technology, applied in the direction of electrical components, amplifiers, components of amplifiers, etc., can solve problems such as cost

Active Publication Date: 2008-09-03
ASUSTEK COMPUTER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the traditional pop-proof circuit, since the polarity of the control signal is opposite to that of the power supply Vcc, it is necessary to use a bipolar junction transistor 108 as an inverter in the design, which requires additional cost

Method used

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no. 1 example

[0016] According to the first embodiment of the present invention, only one first diode 202 is used to form a pop-proof circuit, not only the circuit is simple, but also the required cost is only the price of one first diode. And because the control signal is in the same phase as the power supply Vcc, in terms of control, it is only necessary to switch the control signal after the set time arrives to convert the first diode from forward bias to reverse bias. Not complicated.

[0017] Refer to FIG. 3 which shows the anti-pop circuit according to the second embodiment of the present invention. In this embodiment, the time is set by a charge and discharge circuit composed of a resistor and a capacitor, and the first diode is switched from forward bias to reverse bias after the set time is reached, which can be used The length of the setting time can be changed by adjusting the size of the resistance value and the capacitance value.

[0018] According to this embodiment, the sou...

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Abstract

The invention provides the burst sound prevention circuit constituted by the diode, the one controlling signal is used to alter the leaning pressure state of the diode, so the burst sound produced from the unlocking or the closing of the power supply can be educed.

Description

【Technical field】 [0001] The present invention relates to a mute circuit, and in particular to a mute circuit designed with diodes. 【Background technique】 [0002] Traditionally, the sound output circuit 100 is designed as shown in Figure 1, an electrostatic protection circuit 102, in order to prevent external static electricity from entering this sound output line 100 and destroying the internal circuit, a sound signal from the sound integrated circuit or amplifier , output after passing through the low-pass filter 104 and the electrostatic protection circuit 102 . [0003] However, when switching on and off, the output sound signal will often have a "popping" phenomenon. This is because the output signal is interfered by the surge when the power supply Vcc is started, because at the moment of switching the power supply Vcc, the power supply Vcc has not yet entered In a steady state, the output quality of the sound cannot be confirmed. Therefore, traditionally, in order t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/00
Inventor 吉正然李鸿渊游胜能杨盛富
Owner ASUSTEK COMPUTER INC