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Silencing circuit for start-up and close-down

A mute circuit, switch machine technology, applied in the direction of electrical components, pulse processing, pulse technology, etc., can solve the problems of slow response speed, poor adaptability, etc., achieve cost enhancement, solve instantaneous noise, improve reliability and anti-interference ability Effect

Active Publication Date: 2009-09-30
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defects of slow response speed and poor adaptability of the switch machine mute circuit in the prior art, the present invention provides a new switch machine mute circuit. The applicability of the circuit in different power amplifier circuits

Method used

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  • Silencing circuit for start-up and close-down

Examples

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Embodiment 1

[0015] Embodiment one, such as figure 1 As shown, the inverting input terminal of the comparator U1A is connected to the DC power supply VCC on the one hand, and grounded through the energy storage capacitor C1 on the other hand. Specifically, the inverting input terminal of the comparator U1A is connected to the DC power supply VCC through a voltage dividing resistor R3, and grounded through another voltage dividing resistor R4. The DC power supply VCC is the main power supply of the TV set, which has the characteristics of large driving load capacity and fast power-off speed. In order to realize that when the power supply is powered off, that is, when the DC power supply VCC is equivalent to being short-circuited to the ground, the charge in the energy storage capacitor C1 can be discharged in time, between the inverting input terminal of the comparator U1A and the DC power supply VCC A switching diode D1 is connected between them, the anode of the switching diode D1 is con...

Embodiment 2

[0022] In the second embodiment, the peripheral circuits connected to the non-inverting input terminal and the inverting input terminal of the comparator U1A are interchanged, so as to achieve the purpose of turning on and off the TV to mute. With this circuit structure, when the TV is turned on and off, the comparator U1A outputs a low-level signal, which can be directly connected to the mute end of the power amplifier chip that is effective for low-level muting or through a reverse circuit to connect to the power amplifier chip that is effective for high-level muting. The mute end of the power amplifier can also achieve the purpose of mute on and off.

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Abstract

The invention discloses a switch machine mute circuit, comprising a DC power supply, a power amplifier circuit, a comparator and two energy storage capacitors, the first input end of the comparator is connected to the first energy storage capacitor on the one hand, and connected to the The DC power supply mentioned above; the second input terminal of the comparator is connected to the DC power supply via a voltage dividing resistor on the one hand, and connected to the cathode of the first switching diode on the other hand, and the anode of the first switching diode is connected to the The second energy storage capacitor mentioned above is connected to the DC power supply through a resistor on the other hand; the output terminal of the comparator outputs a high-level or low-level control signal to the mute terminal of the power amplifier circuit. The present invention realizes the accurate muting of power amplifier circuit start-up and shutdown by adopting a simple circuit structure, effectively solves the problem of instantaneous noise when switching on and off electrical equipment such as televisions and audio equipment, strengthens the versatility of the muting circuit, and improves the response of the muting circuit Speed, reliability and immunity to interference.

Description

technical field [0001] The invention belongs to the technical field of mute circuits, and in particular relates to a switch mute control circuit of a power amplifier circuit. Background technique [0002] When the TV is just powered on or the TV is just powered off, the input signal noise caused by the power-on or power-off noise of the pre-stage audio processing chip, and the noise caused by the power amplifier chip itself due to power-on or power-off are all generated in the speaker. The abnormal sound forms the noise of switching on and off, which seriously affects the quality of the TV product. With the continuous improvement of consumer consumption level, people's requirements for the softness of the accompanying sound are also continuously improved, which makes the realization and improvement of the mute circuit more and more important. At present, although there are many kinds of circuits to realize the mute of the TV on and off, they generally can only achieve power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/1252H03K5/1254H03F1/26
Inventor 李永亮
Owner HISENSE VISUAL TECH CO LTD
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