Digital communication system, particularly color television tran

Details Digital communication system, particularly color television tran Digital communication system, particularly color television tran

1983-09-28

1986-02-25

Bookbinder, Marc E.

Pulse or digital communications

Repeaters

Testing

332 11D, 358135, 375122, H03M 738

Patent

active

045731675

ABSTRACT:
To convert an input-word sequence into a digital line code of half the bit rate of the input-word sequence, particularly for digital color television signal transmission, an encoder is disclosed which has a difference branch in which the difference (D.sub.i) between every two successive input words (X.sub.i-1, X.sub.i) is converted into a difference code word (D.sub.i) by adaptive PCM quantization, and a sum branch in which the sum (S.sub.i) of the same successive input words (X.sub.i-1, X.sub.i) is converted into a difference code word (S.sub.i +P.sub.i) in a hybrid DPCM encoder. These two words are combined into a line code word (C.sub.i) by an adder (9). The quantizing characteristic of the adaptive PCM quantizer (1) is selected as a function of the prediction error present within the hybrid DPCM encoder (2). The decoder at the receiver of the novel communication system splits up the received line code word (C.sub.i) into the difference code word (D.sub.i) and the sum code word (S.sub.i +P.sub.i) and decodes these words into the original words (D'.sub.i, S'.sub.i) in an adaptive PCM requantizer (13) and a hybrid DPCM decoder (10, 11, Q1), respectively. The two words (X'.sub.i-1, X'.sub.i) of the original pair are recovered by addition, subtraction, and subsequent division in half. Like in the encoder, the quantizing characteristic of the adaptive PCM requantizer (13) is selected as a function of the prediction error present within the DPCM decoder (11).

REFERENCES:
patent: 3403226 (1968-09-01), Wintringham
patent: 3824590 (1974-07-01), Limb
"Digital Coding of NTSC Signals Using DPCM in the Hadamard-Transformed Domain", M. Ishii et al., Fujitsu Scientific and Technical Journal, Jun. 1976, pp. 123-138, 358-413.

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