PCM信号から量子化雑音を除去するための方法及びユニット

Japanese Patent JP2005516442

A

A method and unit for substracting quantization noise from a pulse code modulated PCM signal being segmented into frames. For achieving this it is proposed to first calculate for each frame of the PCM signal a quantization noise level Bq according to an equation having parameters including n which indicates a specific sample of the PCM signal, S*_min[n] which represents the minimum quantization noise level for a specific sample value s*[n] of the PCM signal, S*_max[n] which represents the maximum quantization noise level for the specific sample value s*[n] of the PCM signal, w[n] which represents a window-function and W which represents the number of samples per window. Subsequently, the quantization noise as represented by the quantization noise level Bq has to be substracted from the PCM signal, preferably with the help of a suitable background noise substracting system. $\begin{array}{cc}{B}_q=\sqrt{\sum _{n=0}^{W-1}\frac{{\left\{\left(s_{\min }^{*}\left[n\right]-s_{\max }^{*}\left[n\right]\right).w\left[n\right]\right\}}^2}{12}}& \left(I\right)\end{array}$

Ercan, F. Gigi

JP2003562931A

June 02, 2005

December 23, 2002

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Koninklijke Philips Electronics N.V.

H03M7/50; G10L19/032; G10L21/0208; G11B20/10; H03M1/08; H04B14/04; H04N5/926; (IPC1-7): H03M7/50

JPH1013244A

1998-01-16

LEVENT ARSLAN ET AL.: "New Methods for Adaptive Noise Suppression", PROCEEDINGS OF THE CONFERENCE, ACOUSTICS, SPEECH, AND SIGNAL PROCESSING, 1995 (ICASSP-95), vol. 1, JPN6008035437, May 1995 (1995-05-01), pages 812 - 815, ISSN: 0001259862

Kenji Yoshitake
Hidetoshi Tachibana
Yasukazu Sato
Hiroshi Yoshimoto
Yasushi Kawasaki

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