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Voice drive circuit for reducing sonic boom when switching on and shutting down

A sound-driven, on-off technology, applied in improving amplifiers to reduce temperature/power supply voltage changes, electrical components, adjusting electrical variables, etc., can solve complex problems such as design and processing of reference voltages that are not mentioned

Inactive Publication Date: 2009-09-02
SUNPLUS MMEDIA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned known technologies are all dealing with the ramp voltage or the power supply voltage, and have not mentioned or designed and dealt with the reference voltage
Moreover, the above known technologies are more complicated

Method used

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  • Voice drive circuit for reducing sonic boom when switching on and shutting down
  • Voice drive circuit for reducing sonic boom when switching on and shutting down
  • Voice drive circuit for reducing sonic boom when switching on and shutting down

Examples

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Embodiment Construction

[0024] The sound driving circuit for reducing popping noise of the switching machine of the present invention will be described in detail below with reference to the drawings.

[0025] figure 2 The present invention provides a sound drive circuit for reducing the popping sound of switching machines. As shown in the figure, the sound driving circuit 20 includes a reference voltage generating unit 11 , a reference voltage stabilizing unit 22 , and an audio driving unit 13 . The sound driving circuit 20 is a single power supply driving circuit, so the reference voltage generating unit 11 is used to generate a reference voltage Vref of 1 / 2 power supply voltage (Vcc / 2) for the audio driving unit 13 . In order to stabilize the reference voltage Vref, a reference voltage stabilizing unit 22 is arranged between the reference voltage generating unit 11 and the audio driving unit 13 . like figure 2 As shown, the reference voltage stabilizing unit 22 is a second-order low-pass filte...

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PUM

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Abstract

The invention provides a voice drive circuit for reducing sonic boom when switching on and shutting down, comprising a reference voltage generating unit, a low-pass filtering unit and a drive unit, wherein the reference voltage generating unit is used for generating a reference voltage; the low-pass filtering unit is a low-pass filter which has at least two stages and is used for generating a filtered reference voltage after receiving the reference voltage; and the drive unit is used for receiving an frequency input signal and the filtered reference voltage, and generating an frequency output signal. The low-pass filter with two stages or more than two stages of the low-pass filtering unit is used for controlling variable quantity of the corresponding reference voltage when switching on and shutting down so as to reduce sonic boom when switching on and shutting down.

Description

technical field [0001] The present invention relates to a sound driving circuit for reducing popping sound of switching machines, in particular to a sound driving circuit which utilizes a second-order or higher-order low-pass filter to control the variation of reference voltage when switching machines. Background technique [0002] figure 1 It is a known sound driving circuit. As shown in the figure, the sound driving circuit 10 includes a reference voltage generating unit 11 , a reference voltage stabilizing unit 12 , and an audio driving unit 13 . Generally speaking, the audio driving circuit 10 is a single-supply driving circuit, so the reference voltage generating unit 11 is used to generate a reference voltage Vref of 1 / 2 power supply voltage (Vcc / 2) for the audio driving unit 13 . After the reference voltage Vref is stable, the sound signal is input from Vin, and the user can listen to the music output from the audio driving unit 13 through the earphone (HP) 14 . In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30H03G3/00H03G3/34G05F3/16
Inventor 陈智伟
Owner SUNPLUS MMEDIA
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