Noise suppression device, noise suppression method, and program

A noise suppression and noise technology, applied in the field of noise suppression devices, can solve problems such as preventing speech from being heard, and achieve the effect of suppressing the deterioration of sound quality

Inactive Publication Date: 2012-04-04
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using these electronic devices, sounds emitted from the surrounding environment can mix into the microphone, preventing speech from being heard

Method used

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  • Noise suppression device, noise suppression method, and program
  • Noise suppression device, noise suppression method, and program
  • Noise suppression device, noise suppression method, and program

Examples

Experimental program
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no. 1 example

[0041] 2. The second embodiment

[0042] 3. Modify

[0043] 1. The first embodiment

[0044] noise suppression device

[0045] figure 1A configuration example of the noise suppression device 10 according to the first embodiment is shown. The noise suppression device 10 has a signal input terminal 11 , a framing unit 12 , a windowing unit 13 , a fast Fourier transform unit 14 and a noise suppression gain generation unit 15 . Furthermore, the noise suppression device 10 has a Fourier coefficient correcting unit 16 , an inverse fast Fourier transform unit 17 , a windowing unit 18 , an overlap adding unit 19 and a signal output terminal 20 .

[0046] The signal input terminal 11 is a terminal for supplying an input signal y(n). The input signal y(n) is a digital signal with normalized frequency fs. The framing unit 12 divides the input signal y(n) supplied to the signal input terminal 11 into a predetermined frame length, for example, a frame length of Nf sample frames, and ...

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PUM

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Abstract

The invention discloses a noise suppression device, a noise suppression method, and a program. The noise suppression device includes a framing unit, a band dividing unit, a band power computing unit, a noise determining unit that determines whether or not each band is noise, a noise band power estimating unit, a noise suppression gain determining unit, a noise suppression unit that applies the noise suppression gains and obtains a band divided signal of which noise has been suppressed, a band synthesizing unit, and a framing synthesizing unit that synthesizes the frames of the framing signals; the noise suppression gain determining unit having an SNR computing unit that computes an SNR for each band, and a SNR smoothing unit that smoothes the SNR computed for each band; wherein the noise suppression gains for each band are determined based on the SNR of each band smoothed by the SNR smoothing unit; and wherein the SNR smoothing unit changes the smoothing coefficient.

Description

technical field [0001] The present disclosure relates to a noise suppression device, a noise suppression method, and a program, and more particularly, to a noise suppression device and the like that perform estimation of a noise signal from an input signal and obtain an output signal that is a noise signal that has been selectively reduced. Background technique [0002] Heretofore, electronic devices such as communication devices such as those using VoIP (Voice over Internet Protocol) and cellular phones, and IC recorders that subject a human's voice recorded through a microphone to AD (analog-to-digital) have been widely used. ) conversion, and transmit / record it as a digital signal, and then play it back. When using these electronic devices, sounds emitted from the surrounding environment may mix into the microphone, preventing speech from being heard. [0003] Now, in the related art, for cellular phones and the like, a noise suppression technique has been used in which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02G10L21/0208G10L21/0232G10L25/78G10L25/93
CPCG10L21/0208G10L21/038
Inventor 牧野坚一知念彻
Owner SONY CORP
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