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Squelch circuit

A mute circuit, mute technology, applied in the field of circuits, to achieve the effect of reducing POP sound, stable and reliable performance, and wide practicability

Inactive Publication Date: 2011-05-25
新奇点智能科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] figure 1 The circuit shown seems to be perfect from the principle analysis, but in actual application, there will still be a pop sound when the power is turned on, and the pop sound is louder, and there is a small but still clearly audible pop sound when the power is turned off Voice

Method used

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Embodiment Construction

[0050] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention.

[0051] figure 1 In the circuit shown, the power supply Vi changes from a low voltage to a high voltage when the power is turned on, the power-off mute transistor Q4 is cut off, the power-on mute transistor Q5 is turned on, and then the first transistor Q1 and the second transistor Q2 are turned on, Output the first output signal Vo1 and the second output signal Vo2 to ground respectively, and start the power-on mute function. At the same time, when the power supply Vi is powered on, the energy storage capacitor C1 starts to charge through the first voltage dividing resistor R1, the second voltage dividing resistor R2 and the base of the power-on mute transistor Q5, an...

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Abstract

The present invention discloses a mute circuit to effectively reduce the POP sound generated by the overvoltage pulse when the equipment is electrified and cut off. The mute circuit comprises an electrifying current limiting circuit, a first cutting-off current limiting circuit and a second cutting-off current liming circuit. The electrifying current limiting circuit does current limiting to the electrifying process of the silent circuit. The first cutting-off current and the second cutting-off current does current limiting to the cutting-off process of the silent circuit. The capacity of thecircuit is more stable and reliable and the mute circuit is widely applied in the electronic product for consumption.

Description

technical field [0001] The invention relates to a circuit, in particular to a mute circuit. Background technique [0002] Mute circuits are an important part of the consumer electronics design process. The function of the mute circuit is to eliminate the POP sound generated by the overshoot voltage during the switching on and off of equipment such as TV sets and set-top boxes. POP sound refers to the popping sound caused by the transient impact caused by various operations of audio devices at the moment of power-on, power-off and after power-on stability. The POP sound has a great impact on the equipment, not only will it affect the quality of the equipment, but also damage the equipment in severe cases, such as excessive current overshoot may damage other components such as speakers or equipment. Therefore, whether there will be POP sound energy during the process of power-on and power-off, such as switching on and off, can directly measure the design quality of a device....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/1254
Inventor 张辉王西强孟斐
Owner 新奇点智能科技集团有限公司
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