Digital audio compression system

Details Digital audio compression system Digital audio compression system

1993-09-29

1995-02-07

MacDonald, Allen R.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

395 2, 395 21, 381 29, G10L 900

Patent

active

053881818

ABSTRACT:
The digitally sampled data is split into a plurality of subbands each covering a different frequency range. The subbands are each individually expanded to normalize the energy in each band and the subbands are converted by FFT to the frequency domain and the magnitude and phase portions are processed by different techniques based on psychoacoustic principles. Magnitude data are processed by tree structured vector processing to develop code books for each subband which are unique to each song. Phase data are uniformly quantized with dynamic bit allocation used to increase resolution on transient passages.

REFERENCES:
patent: 3982070 (1976-09-01), Flanagan
patent: 4232295 (1980-11-01), McConnell
patent: 4287568 (1981-09-01), Lester
patent: 4300040 (1981-11-01), Gould et al.
patent: 4330689 (1982-05-01), Kang et al.
patent: 4528643 (1985-07-01), Freeny, Jr.
patent: 4559602 (1985-12-01), Bates, Jr.
patent: 4667340 (1987-05-01), Arjmand et al.
patent: 4790016 (1988-12-01), Mazor et al.
patent: 4896362 (1990-01-01), Veldhuis et al.
patent: 4916742 (1990-04-01), Kolesnikov et al.
patent: 4922537 (1990-05-01), Frederiksen
patent: 4935963 (1990-06-01), Jain
patent: 4949383 (1990-08-01), Koh et al.
patent: 4953214 (1990-08-01), Takeguchi et al.
patent: 4963030 (1990-10-01), Makur
patent: 4965830 (1990-10-01), Barham et al.
patent: 5021971 (1991-06-01), Lindsay
patent: 5027376 (1991-06-01), Friedman et al.
patent: 5040217 (1991-08-01), Brandenburg et al.
patent: 5067152 (1991-11-01), Kisor et al.
patent: 5068899 (1991-11-01), Ellis et al.
patent: 5086475 (1992-02-01), Kutaragi et al.
patent: 5091944 (1992-02-01), Takahashi
patent: 5115240 (1992-05-01), Fujiwara et al.
patent: 5197087 (1993-03-01), Iwahashi et al.
patent: 5222189 (1993-06-01), Fielder
Gray, Robert M., "Vector Quantization," IEEE ASSP Magazine, Apr. 1984, pp. 4-29.
Jayant, N. S., "High-Quality Coding of Telephone Speech and Wideband Audio," IEEE Communications Magazine, Jan. 1990, pp. 10-20.

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