Perceptual audio signal subband coding using value classes for s

Details Perceptual audio signal subband coding using value classes for s Perceptual audio signal subband coding using value classes for s

1995-08-31

1999-11-23

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704205, 704227, 704503, G10L 704

Patent

active

059917156

ABSTRACT:
A method of transmitting digitized block coded audio signals includes forming scale factors of the digitized audio signals. The n(k-1) differences are formed from k successively in-time scale factors for each frequency sub-band or for a group of spectral values of the audio signal. The n(k-1) differences are grouped into at least two value classes. New scale factors are selected for each of the n sub-bands or spectral value groups based on a sequence of n(k-1) value classes. Identifying information, including the control information indicating at which locations in the sequence of n(k-1) value classes the selected new scale factors are disposed, is associated with each sequence of n(k-1) value classes. The associated selected new scale factors are assigned to each sequence of the sampled signal values and to the identifying information associated with each sequence of sampled signal values. A transmission pattern of new scale factors is determined separately for each of the n sub-bands or spectral value groups. Lastly, audio signals are regenerated from the sampled signal values and from the assigned selected new scale factors.

REFERENCES:
patent: 4464783 (1984-08-01), Beraud et al.
patent: 4972484 (1990-11-01), Theile et al.
Plenge et al., "Combined Channel Coding and Concealment," IEE Colloquim on Terrestrial DAB -- Where is it Going?, (Digest No. 042) p. 3/1-8, Feb. 17, 1993.

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