Coded data generation or conversion – Digital code to digital code converters
Patent
1994-01-19
1997-06-24
Gaffin, Jeffrey A.
Coded data generation or conversion
Digital code to digital code converters
395 238, H04B 166, H03M 738
Patent
active
056421117
ABSTRACT:
A high efficiency encoding method in which pre-set bit allocation is made for digital information signals of plural channels and in which coded information signals are produced by the allocated bits. It is desirable in this type of the high efficiency encoding method to avoid sound quality deterioration produced by pre-echo during abrupt changes in the information signals as well as to suppress the pre-echo to assure aurally desirable bit allocation. To this end, in the high efficiency encoding method, in which digital information signals of plural channels are normalized by normalizing units and pre-set bit allocation is made by a bit allocation unit to effect pre-set bit allocation. The amounts of bit allocation between channels are controlled on the basis of temporal changes of the information signals of the respective channels. Besides, the amounts of bit allocation between channels are controlled based on temporal changes of the amplitude information of digital information signals of the respective channels. At least a part of the bits that may be used for bit allocation is preferentially allocated for channels having larger temporal changes of the information signals depending on the magnitude of temporal changes of the information signals among the plural channels. As a result, deterioration in the sound quality due to pre-echo during high efficiency encoding may be prevented in a system having plural audio signal channels.
REFERENCES:
patent: 3349183 (1967-10-01), Campanella
patent: 4184049 (1980-01-01), Crochiere et al.
patent: 4455649 (1984-06-01), Esteban et al.
patent: 4516241 (1985-05-01), Farah et al.
patent: 4535472 (1985-08-01), Tomcik
patent: 4569058 (1986-02-01), Grallert
patent: 4573187 (1986-02-01), Bui et al.
patent: 4622598 (1986-11-01), Doi et al.
patent: 4625286 (1986-11-01), Papamichalis et al.
patent: 4697212 (1987-09-01), Osawa et al.
patent: 4706265 (1987-11-01), Furukawa
patent: 4713776 (1987-12-01), Araseki
patent: 4748579 (1988-05-01), Zibman et al.
patent: 4873589 (1989-10-01), Inazawa et al.
patent: 4882754 (1989-11-01), Weaver et al.
patent: 4885790 (1989-12-01), McAulay
patent: 4903301 (1990-02-01), Kondo et al.
patent: 4912763 (1990-03-01), Galand et al.
patent: 4932062 (1990-06-01), Hamilton
patent: 4949383 (1990-08-01), Koh
patent: 4964166 (1990-10-01), Wilson
patent: 5016107 (1991-05-01), Sasson et al.
patent: 5040217 (1991-08-01), Brandenburg et al.
patent: 5109417 (1992-04-01), Fielder et al.
patent: 5115240 (1992-05-01), Fujiwara
patent: 5120387 (1992-06-01), Yoshikawa
patent: 5128963 (1992-07-01), Akagiri
patent: 5142656 (1992-08-01), Fielder et al.
patent: 5159611 (1992-10-01), Tomita et al.
patent: 5185800 (1993-02-01), Mahieux
patent: 5197087 (1993-03-01), Iwahashi et al.
patent: 5204677 (1993-04-01), Akagiri et al.
patent: 5218561 (1993-06-01), Iwadare
patent: 5222189 (1993-06-01), Fielder
patent: 5235671 (1993-08-01), Mazor
patent: 5241603 (1993-08-01), Akagiri et al.
patent: 5243588 (1993-09-01), Maeda et al.
patent: 5264846 (1993-11-01), Oikawa
patent: 5268685 (1993-12-01), Fujiwara
patent: 5285476 (1994-02-01), Akagiri et al.
patent: 5294925 (1994-03-01), Akagiri
patent: 5301205 (1994-04-01), Tsutsui et al.
patent: 5311561 (1994-05-01), Akagiri
patent: 5349549 (1994-09-01), Tsutsui
patent: 5375189 (1994-12-01), Tsutsui
patent: 5381143 (1995-01-01), Shimoyoshi et al.
patent: 5388093 (1995-02-01), Yoshida et al.
patent: 5388209 (1995-02-01), Akagiri et al.
patent: 5406428 (1995-04-01), Suzuki
patent: 5454011 (1995-09-01), Shimoyoshi
patent: 5461378 (1995-10-01), Shimoyoshi et al.
patent: 5471558 (1995-11-01), Tsutsui
Polyphase Quadrature Filters--A New Subband Coding Technique Rothweiber IC ASSP 1983, Boston vol. 3 pp. 1280-1283.
Critical Band Coder--Digital Encoding of Speech Signals Basen on the Perceptual Requirements of The Auditory System Krasner IEEE vol. 1-3 pp. 327-331.
Linear Prediction with a Variable Analysis Frame Size, Ghandra et al IEEE Transactions on Acoustics Speech & Signals vol. ASSP-25 #4 Oct. 1977.
Digital Coding of Speech in Sub-bands, Crochiere et al., The Bell System Technical Journal, vol. 55, No. 8, Oct. 1976.
An application-specific FFT processor Electronic Engineering, Jun. 1988 pp. 100 and 104-106.
An Application Specific DSP Chip for 100 MHZ Data Rates, Magar et al., IEEE 1988--pp. 1989-1992.
Perceptual Transform Coding of Wideband Stereo Signals, James D. Johnston, ICASSP '89, vol. 3, pp. 1993-1996.
Signal Compression: Technology Targets and Research Directions, Nikil Jayant, IEEE vol. 10, No. 5, pp. 796-818.
Subband/Transform Coding Using Filter Bank Designs Based on Time Domain Aliasing Cancellation, Princen et al., 1987 ICCC, pp. 2161-2164.
Gaffin Jeffrey A.
Jean-Pierre Peguy
Sony Corporation
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