Pulse or digital communications – Repeaters – Testing
Patent
1987-02-10
1988-10-04
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
332 11D, 358135, H04B 1406
Patent
active
047759860
ABSTRACT:
A decoding circuit for digital samples defining N points of an initial digital signal coded into p bits transmitted by a transmitter by means of differential pulse code modulation (DPCM) into r bits for application in picture display and picture fading devices. It is characterised in that it contains DPCM decoding devices which effect, from received digital samples in accordance with a clock H1 having a period T1 in a single interpolation and transcoding arrangement, the combination of a transcoding and a linear interpolation obtained by a division of the absolute difference da between two initial samples by a number n in order to provide transcoded and divided digital samples dad (where dad=da
) which are processed in an adder at a rate which is higher than the transcoding rate determined by a clock H2 having a period T2 such that T2=T1
in which n is a positive even number in order to recover M points of the decoded DPCM signal in which M is higher than N, the supplementary points being obtained by linear interpolation.
REFERENCES:
patent: 4292651 (1981-09-01), Kretz et al.
patent: 4363103 (1982-12-01), Richard et al.
patent: 4438452 (1984-03-01), Powers
patent: 4449143 (1984-05-01), Dischert et al.
patent: 4568963 (1986-02-01), Sakai et al.
patent: 4574383 (1986-03-01), Irie et al.
Chin Stephen
Gadson Gregory P.
Griffin Robert L.
U.S. Philips Corporation
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