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Audio signal noise reduction device and method

An audio signal and noise reduction technology, applied in the field of audio signal noise reduction equipment, can solve problems such as complex noise transmission paths

Inactive Publication Date: 2007-09-19
SONY GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such noise complicates the noise transmission path to the microphone unit, resulting in the limitation of previous passive methods for noise reduction

Method used

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  • Audio signal noise reduction device and method
  • Audio signal noise reduction device and method
  • Audio signal noise reduction device and method

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Embodiment Construction

[0053] In the following, an exemplary preferred embodiment of the present invention for practical use of a method for an audio signal noise reducing apparatus is described by referring to the accompanying drawings. In FIG. 1 , any components corresponding to those of FIG. 12 are given the same reference numerals and will not be described in detail again.

[0054] The example of FIG. 1 is similar to the example of FIG. 12 in that the noise timing signal 12 is generated by the built-in HDD control microprocessor 10 with DSP and is used as a control signal for the selection switch 4 as it is. During seek operation, the noise timing signal 12 operates to control the connection of the movable contact 4c of the selector switch 4 to its fixed contact 4b and selects the signal from the adder 21 . At other timings, the noise timing signal 12 operates to control the connection of the movable contact point 4c of the selector switch 4 to its fixed contact point 4a and to select the audio ...

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Abstract

An audio signal noise reduction device includes: input means for making an input of one or more audio signals; timing generation means for generating a gap period in accordance with a generation period of noise coming from a noise generation source included in the audio signal; noise removal means for removing the noise from the audio signal; level envelope detection means for continuously detecting a level envelope of the audio signal; coefficient generation means for generating a coefficient for the level envelope in the gap period in accordance with a signal level provided by the level envelope detection means; interpolation signal generation means; level modulation means for subjecting a signal from the interpolation signal generation means to level modulation using the coefficient generated by the coefficient generation means; mixing means for mixing an output from the noise removal means and an output from the level modulation means; and selection means for outputting a signal from the mixing means in a period corresponding to the gap period, and outputting the audio signal not in the gap period.

Description

technical field [0001] The present invention relates to an audio signal noise reduction device installed, for example, in a digital personal electronic device, and reduces the noise level of an audio signal picked up by a small-sized microphone, and an audio signal noise reduction method. Background technique [0002] Each of digital personal electronic devices including small-sized microphones, such as video cameras, digital still cameras, and IC recorders, is becoming smaller in size. Such a small-sized device often poses a problem of causing an unpleasant shock noise, touch noise, or click noise when audio is reproduced. Such noise is caused by frequent accidental contact at the microphone and its vicinity when acquiring audio, or click operations of various function switches SW, causing noise to enter the microphone after being transmitted through the cabinet. Another problem arises from the proximity between the internal microphone and recording devices such as magneti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02H04R3/00
CPCG10L21/0264G10L21/0208G10L21/01G10L21/0232H04R3/00
Inventor 小泽一彦
Owner SONY GRP CORP
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