Wide-band signal encoder

Details Wide-band signal encoder Wide-band signal encoder

1996-02-26

1998-10-13

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704219, 704222, 704229, 704230, G10L 914

Patent

active

058227229

ABSTRACT:
A block length judging circuit 120 switches block lengths based on a feature quantity obtained from an input signal. A transform circuit 200 executes transform of the signal into frequency components according to the block length. A masking threshold calculating circuit 250 calculates a masking threshold simulating the masking characteristic of psychoacoustical property for each predetermined intra-block section. An inter-block/intra-block bit assignment circuit 300 executes inter-block bit number assignment and/or intra-block bit number assignment to each predetermined intra-block section. A vector quantization circuit 350 vector quantizes transform signal by switching codebooks 360.sub.1 to 360.sub.N according to the assignment bit number, and also quantizes gain by using a gain codebook 370.

REFERENCES:
patent: 4677671 (1987-06-01), Galand et al.
patent: 5151941 (1992-09-01), Nishiguchi
patent: 5414795 (1995-05-01), Tsutsui et al.
patent: 5471558 (1995-11-01), Tsutsui
patent: 5488665 (1996-01-01), Johnston et al.
patent: 5535300 (1996-07-01), Hall, II et al.
patent: 5592584 (1997-01-01), Ferreira et al.
patent: 5651090 (1997-07-01), Moriya et al.
patent: 5666465 (1997-09-01), Ozawa
Johnston, "Transform Coding of Audio Signals Using Perceptual Noise Criteria", IEEE Journal on Selected Areas in Communications, vol. 6(2):314-323, Feb. 1988.
Princen et al., "Analysis/Synthesis Filter Bank Design Based on Time Domain Aliasing Cancellation", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-34(5):1153-1161, Oct. 1986.
Linde et al., "An Algorithm For Vector Quantizer Design", IEEE Transactions on Communications, vol. COM-28(1):84-95, Jan. 1980.
Wang et al., "An Objective Measure For Predicting Subjective Quality of Speech Coders", IEEE Journal On Selected Areas in Communications, vol. 10(5):819-829, Jun. 1992.
Sugamura et al., "Quantizer Design in LSP Speech Analysis-Synthesis", IEEE Journal on Selected Areas in Communications, vol. 6(2):432-440, Feb. 1988.
Vaidyanathan, "Multirate Digital Filters, Filter Banks, Polyphase Networks, and Applications: A Tutorial", Proceedings of the IEEE, vol. 78(1):56-93, Jan. 1990.

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