Title:
アダプティブディザを減算し、埋没チャンネルビットを挿入し、フィルタリングすることによりマルチビット符号ディジタル音声を符号化する方法及び装置、及びこの方法のための符号化及び復号化装置。
Document Type and Number:
Japanese Patent JP3782103
Kind Code:
B2
Abstract:
For encoding sound received as a stream of multibit input sample, from a finite length sequence of input samples, an instantaneous audibility threshold characteristic is determined. Next, a shaped, dither determined, signal is subtracted from the input samples to produce processing samples. Subtracting a dither signal dynamically ignores processing sample bits below the threshold. Next, quantization by a variable number of bits below the threshold is performed, while retaining all sample bits above the threshold. The ignored bits are replaced by the dither signal as buried channel bits at an adjustable number of bits per sample. Therefore, upgraded samples have non-ignored bits and buried channel bits are obtained and outputted. The noise is shaped through shape-filtering a difference between the upgraded samples and the processing samples, which shape-filtering may amend a received white-noise-like signal towards an actual threshold-versus-frequency characteristic.
Inventors:
Omen Arnoldus Werner Johannes
Fraunewechen Marc Edwin
Van der Wal Robert Hellbrand
Feldouis Raymond Nicholas Johann
Fraunewechen Marc Edwin
Van der Wal Robert Hellbrand
Feldouis Raymond Nicholas Johann
Application Number:
JP51787295A
Publication Date:
June 07, 2006
Filing Date:
December 13, 1994
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
G10L19/018; H03H21/00; H03M7/30; H03M7/34; H04B1/66; G10L19/04
Domestic Patent References:
| JP3167927A | ||||
| JP6509201A |
Foreign References:
| EP0540330A2 | ||||
| WO1994003988A2 | ||||
| WO1994018762A1 |
Other References:
M.A.Gerzon and P.G.Graven,”A High-Rate Buried-Data Channel for Audio CD”,J. Audio Eng. Soc.,Vol.43,No 1/2,1995 January/February,p.3-22(1995/01-1995/02)
S.P.Lipshitz et al,”Quantization and Dither:A theoretical Survey”,J. Audio Eng. Soc.,Vol.40,no.5,1992 May,p.355-375(1992/05)
S.P.Lipshitz et al,”Quantization and Dither:A theoretical Survey”,J. Audio Eng. Soc.,Vol.40,no.5,1992 May,p.355-375(1992/05)
Attorney, Agent or Firm:
Kosaku Sugimura