Patent
1994-05-17
1996-08-13
Tung, Kee Mei
395 231, 395 225, 395 229, 395 272, G10L 302
Patent
active
055464980
ABSTRACT:
A method of and a device for speech signal digital coding are described, where spectral parameters are quantized at each frame in order to exploit the actual correlation inside a frame or between contiguous frames. The quantization devices (DQ) recognize strongly correlated signal periods by using a first set of indexes (j.sub.1), representing the parameters and provided by the spectral analysis circuits (ABT, ALT), and in these periods they convert the same indexes into a second set of indexes (j4) which can be coded with a lower number of bits and which is inserted into the coded signal in place of the first set.
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patent: 5351338 (1994-09-01), Wigren
"A 5.85 kb/s Celp Algorithm For Celular Applications", W. Bastiaan Kleijn, eter Kroon (USA), Luca Cellario and Daniele Sereno (Italy), 1993 IEEE, pp. II-596 to II-599.
"A Long History Quantization Approach To Scalar And Vector Quantization . . . ", C. S. Xydeas & K. K. M. So, Department of Elect. Engin. University of Manchester, pp. II-1 to II4, 1993 IEEE.
"Low Bit-Rate Quantization Of LSP Parameters Using Two-Dimension Differention Coding", Chih-Chung Kuo, Fu-Rong Jean, Hsiao-Chuan Wang; Dept. of Electr. Engin. Hsinchu, Taiwan; pp. I-97 to I-100.
Dubno Herbert
Sip - Societa Italiana per l'esercizio Delle Telecomunicazioni S
Tung Kee Mei
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