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Device and method for removing noise of TV set off

A television and noise technology, which is applied in the field of devices for eliminating noise when the television is turned off, can solve the problems of long delay of audio amplifiers, and achieve the effects of eliminating noise, simple structure and steps, and convenient implementation.

Active Publication Date: 2010-09-22
HAIER GRP CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But: sometimes there will be noise when the power is turned off. This is because the MCU has no power supply and stops working after the power is turned off. The audio amplifier cannot be given a control signal to stop it. At this time, the audio amplifier has a large-capacity energy storage element. Delayed work for a period of time, the delay of the audio amplifier is longer than that of the MCU, that is, the discharge time of the sound circuit after shutdown is longer than the discharge time of the MCU circuit. At this time, the fluctuation of the sound processing channel signal due to shutdown will be transmitted to the audio amplifier, and then output to the speaker. noise

Method used

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  • Device and method for removing noise of TV set off
  • Device and method for removing noise of TV set off
  • Device and method for removing noise of TV set off

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0046] figure 1 It is the prior art TV audio amplifier control diagram, refer to figure 1 : the original audio amplifier control diagram is that the MUTE signal sent by the TV MCU is directly sent to the MUTE control pin of the audio amplifier.

[0047] The present invention is to increase the device that eliminates the noise of TV shutdown between the MUTE control pin of MCU and audio amplifier, refer to figure 2 or image 3 : the device includes an electronic energy storage device, and the circuit of the electronic energy storage device is composed of an energy storage element CD1, a triode Q1, a resistor R 2 and diode D2.

[0048] The b-pole of the triode Q1 is connected to the resistor R 1 , the e pole of which is connected to the conducting end of the diode D2; the triode Q1 must be a PNP transistor.

[0049] The anode of the energy storage element CD1 is connected to the e-pole of the transistor Q1 and the conduction terminal of the diode D2, and the cathode is g...

Embodiment 1

[0063] figure 2 It is the circuit diagram of Embodiment 1 of the present invention, such as figure 2 As shown: the present invention adds an electronic energy storage device and a corresponding control circuit between the MCU and the MUTE control pin of the audio amplifier. The control circuit is different according to the working state of the audio amplifier. This embodiment is suitable for audio The amplifier working control terminal is a control circuit that works at a low potential and stops working at a high potential.

[0064] The control circuit includes: resistors R3 and R4, diode D1 and voltage regulator tube DZ1. Among them, the function of D1 prevents the control potential from being pulled down, and can also protect the MCU; R3, R4, and DZ1 limit the current and voltage, protect the amplifier, and at the same time avoid the noise caused by the control potential being too high.

[0065] The electronic energy storage device consists of an energy storage element C...

Embodiment 2

[0073] image 3 It is the circuit diagram of embodiment 2 of the present invention, refer to image 3 , this embodiment is suitable for a control circuit in which the working control terminal of the audio amplifier works at a high potential and stops working at a low potential.

[0074] In the present invention, an electronic energy storage device and a corresponding control circuit are added between the MCU and the MUTE control pin of the audio amplifier. The electronic energy storage device has the same composition as above and will not be described in detail. The control circuit includes resistors R3 and R4. Transistor Q2.

[0075] The working principle of the circuit is the same as that in Embodiment 1, and will not be repeated here.

[0076] The application of the present invention can effectively eliminate the noise caused by the shutdown of the TV, and is also applicable to solving the problem of shutdown noise of other related electric appliances.

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Abstract

This invention discloses a device and a method for eliminating noises when turning off TV, which stores energy when the TV works normally and discharges swiftly when turning off the TV by an electronic energy storing device to generate a control potential, the time generated by which is shorter than that of signal wave of accompanying channels when the TV is turned off so that the audio amplifieris suppressed before the wave caused by turning off the TV of the accompanying sound channel signal is transferred to the amplifier so as to eliminate the turning-off noises.

Description

Technical field [0001] The invention involves the field of noise inhibition, especially for a TV organ to eliminate noise. technical background [0002] With the improvement of people's living standards, regardless of rural or urban television, it has become a necessity for people's daily life. However, the current TV will emit noise in the operation, standing, shutdown, etc., which is not only annoying but also energy. [0003] One of the reasons for correction of the noise is that the sound processing circuit has abnormally fluctuated when booting, changing, and shutdown. [0004] To this end, one of the measures to eliminate noise is that the sound processing circuit does not fluctuate when the above operation is performed, but some are difficult to achieve because the integrated circuit itself is determined.Most of the machines take such measures. [0005] The specific method is to control it through the MCU. During the operation of the table, the MCU's MCU's MUTE foot first ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/60H03F1/00H03F1/30
Inventor 翟翌立刘强陈宜龙杨立房
Owner HAIER GRP CORP