Boots – shoes – and leggings
Patent
1982-01-27
1984-05-15
Kemeny, E. S. Matt
Boots, shoes, and leggings
381 46, 381106, 375122, G10L 100
Patent
active
044491905
ABSTRACT:
In an ADPCM system, improved detection of silence intervals in a speech signal is attained by detecting the level of the logarithm step-size signal (d.sub.n), which is representative of the energy of the speech samples. A speech pattern is converted into a sequence of adaptive digital codes. Intervals of silence in the pattern are detected and a digital code representative of each silence interval is generated. The adaptive digital codes and the silence interval codes are combined to form a digitally coded signal representative of the pattern. The conversion of the pattern to adaptive digital codes includes forming a signal corresponding to the adaptation step-size for each digital code. The silence interval detection includes producing first and second threshold signals. A silence interval signal is initiated when the adaptation step-size corresponding signal diminishes below the first threshold and the silence interval is terminated when the adaptation step-size corresponding signal increases above the second threshold after the silence interval initiation.
REFERENCES:
patent: 4053712 (1977-10-01), Reindl
patent: 4272810 (1981-06-01), Gates et al.
patent: 4280192 (1981-07-01), Moll
Boddie, et al, "Adaptive Differential PCM Coding", The Bell System Technical Journal, vol. 60, No. 7, Sep. 1981, pp. 1547-1561.
Flanagan James L.
Johnston James D.
Bell Telephone Laboratories Incorporated
Cubert Jack S.
Kemeny E. S. Matt
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