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Noise suppression device and noise suppression method

A noise suppression and noise component technology, applied in speech analysis, speech recognition, instruments, etc., can solve the problems of musical noise distortion and unstable spectral characteristics of noise components, so as to reduce speech distortion and improve accuracy.

Inactive Publication Date: 2007-05-23
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practice the spectral characteristics of noise components are not stable, so the residual noise after subtracting the noise floor, especially due to the residual noise between speech tones, produces an unnatural distortion called musical noise

Method used

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  • Noise suppression device and noise suppression method
  • Noise suppression device and noise suppression method
  • Noise suppression device and noise suppression method

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0031] FIG. 1 is a block diagram showing the configuration of a noise suppressing device according to Embodiment 1 of the present invention. The noise suppression device 100 of the present embodiment includes a windowing unit 101, an FFT (Fast Fourier Transform) unit 102, a floor noise estimation unit 103, a band sound / noise detection unit 104, a tone harmonic structure extraction unit 105, and a vocality determination unit 106 , tone frequency estimation unit 107, tone harmonic structure restoration unit 108, sound / noise correction unit 109 for each frequency band, subtraction / attenuation coefficient calculation unit 110, multiplication unit 111 and IFFT (Inverse Fast Fourier Transform) unit 112.

[0032] Windowing section 101 divides an input speech signal including a noise component into frame units of predetermined time units, performs windowing processing using Hanning windows or the like on such frames, and outputs the result to FFT section 102 .

[0033] FFT section 102...

Embodiment approach 2

[0082] FIG. 3 is a block diagram showing the configuration of a noise suppressing device according to Embodiment 2 of the present invention. In addition, the noise suppressing device described in this embodiment has basically the same configuration as the noise suppressing device described in Embodiment 1, so the same or corresponding structural elements are given the same reference numerals, and detailed description thereof will be omitted.

[0083] The structure of the noise suppression device 200 shown in FIG. 3 includes a voice / noise frame determination unit 201 in addition to the components of the noise suppression device 100 described in the first embodiment.

[0084] The speech / noise frame determination unit 201 determines whether the frame obtained by the speech power spectrum is a speech frame or a noise frame based on the speech power spectrum from the FFT unit 102 and the noise floor from the noise floor estimation unit 103 . The judgment result is output to the voc...

Embodiment approach 3

[0098] FIG. 4 is a block diagram showing the configuration of a noise suppressing device according to Embodiment 3 of the present invention. In addition, the noise suppressing device described in this embodiment has basically the same configuration as the noise suppressing device described in Embodiment 1, so the same or corresponding structural elements are given the same reference numerals, and detailed description thereof will be omitted.

[0099] The structure of the noise suppressing device 300 shown in FIG. 4 includes a subtraction / attenuation coefficient averaging processing unit 301 in addition to the constituent elements of the noise suppressing device 100 described in the first embodiment.

[0100] Subtraction / attenuation coefficient averaging processing section 301 averages the subtraction / attenuation coefficients obtained as the calculation results of subtraction / attenuation coefficient calculation section 110 in the time domain and the frequency domain respectively...

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Abstract

There is disclosed a noise suppression device capable of improving the noise suppression accuracy while reducing the audio distortion. In this device, a suppression unit suppresses a noise component from the audio power spectrum by using the detection result of the audio-existing band and the noise band in the audio power spectrum including the noise component. A pitch harmonic structure extracting unit (105) extracts a pitch harmonic power spectrum from the audio power spectrum. An audio-existence judgment unit (106) judges whether the audio power spectrum has audio existence according to the extracted pitch harmonic power spectrum. A pitchharmonic structure repair unit (108) repairs the extracted pitch harmonic power spectrum. A per-band audio / noise correction unit (109) corrects the detection result according to the pitch harmonic power spectrum selected according to the result of judgment by the audio-existence judgment unit (106) among the repaired pitch harmonic power spectrum and the extracted pitch harmonic power spectrum.

Description

technical field [0001] The invention relates to a noise suppressing device and a noise suppressing method, in particular to a noise suppressing device and a noise suppressing method used in a speech communication device and a speech recognition device to suppress background noise. Background technique [0002] Generally, a low bit rate speech coding device can provide high-quality speech conversations for speech without background noise, but for speech containing background noise, it will produce harsh distortion specific to low bit rate coding, resulting in deterioration of sound quality. [0003] As a noise suppression / speech emphasis technique for dealing with such deterioration of sound quality, there is, for example, the spectrum reduction method (hereinafter referred to as "SS method") and the like. [0004] In the SS method, the properties of the noise component are estimated in the silent interval. Then, by subtracting the short-term power spectrum of the noise comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02G10L15/20G10L21/0208G10L21/0232G10L25/93
CPCG10L21/0208G10L25/93G10L21/0232
Inventor 王幼华河嵨拓也吉田幸司
Owner PANASONIC CORP
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