Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1979-04-09
1980-06-03
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
H04L 300
Patent
active
042064473
ABSTRACT:
Known adaptive differential pulse code modulation (ADPCM) coders typically convert a nonuniform input signal to a linearized representation thereof prior to processing the signal. Usually the linearized signal requires more bits than the nonuniform signal. To mitigate the expense of apparatus for manipulating signals having many bits as well as to dissipate a scale size mistrack between the coder and a decoder, the instant ADPCM coder, responsive to an improved adaptive control signal, converts (300, 600) the nonuniform input signal to special semiuniform representation thereof which representation is processed (400, 500, 600) by the ADPCM coder. The semiuniform signal permits use of fewer bits than the prior art linearized representation. Also, the adaptive control signal is provided by a scale index generator including rounding-up and rounding-down means, for dissipating scale size mistrack. Further, the semiuniform signal permits much of the ADPCM process to be confined to relatively inexpensive read only memory (ROM) devices (300, 400, 500, 800).
REFERENCES:
patent: 3772682 (1973-11-01), Flanagan
patent: 3931596 (1976-01-01), Gersho
patent: 3937897 (1976-02-01), Song
Cummiskey, "The Bell System Technical Journal", vol. 52, Sep. 1973, pp. 1105-1118.
Jayant, "The Bell System Technical Journal", vol. 52, Sep. 1973, pp. 1119-1144.
Gibson, "IEEE Transactions on Communications", vol. COM-22, No. 11, Nov. 1974, pp. 1789-1797.
Mitra, "The Bell System Technical Journal", vol. 57, No. 7, part 2, Sep. 1978, pp. 2727-2763.
Ching Yau-Chau
Gotz Ben-Zion
Bell Telephone Laboratories Incorporated
Miller Charles D.
Roddy Richard J.
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