Pulse or digital communications – Repeaters – Testing
Patent
1995-02-23
1997-05-06
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375240, G10L 900
Patent
active
056279370
ABSTRACT:
A novel apparatus, capable of adaptively encoding input digital audio signals from N number of channels, comprises N number of filters for filtering the input digital audio signals, respectively; a first estimator for estimating a first parameter for each of the input digital audio signals; a second estimator for estimating perceptual entropies of the respective frames for each of the input digital audio signals based on the first parameter, to thereby derive a mean and a standard deviation of a first frame group, and for generating second frame groups including F number of frames for each of the N number of channels; a first bit allocation unit for determining bits for each of the second frame groups based on the perceptual entropies for the second frame groups and mean and standard deviation parameters and for generating bit allocation information corresponding to the determined bits for the second frame groups; a second bit allocation unit for determining bits for the respective subbands of each frame included in each of the second frame groups based on the first parameter and the generated bit allocation information; N number of quantizers for quantizing the filtered audio signals in response to the corresponding bit allocation information for the respective subbands of the first frame group; and a circuit for formatting the quantized audio signal together with the generated bit allocation information.
REFERENCES:
patent: 5414795 (1995-05-01), Tsutsui et al.
patent: 5491773 (1996-02-01), Veldhuis et al.
James D. Johnston "Estimation of Perceptual Entropy Using Noise Masking Criteria", ICASSP 88; Internaitonal Conference On Acoustics, Speech And Signal Processing, vol. 5, pp. 2524-2527, Apr. 1988.
Daewoo Electronics Co. Ltd.
Safourek Benedict V.
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