Transmission system

Details Transmission system Transmission system

1984-04-04

1986-02-04

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 34, 358133, 358135, H04N 713

Patent

active

045690588

ABSTRACT:
A transmission system wherein PCM code words are converted into DPCM code words at the transmit side and are reconverted into PCM code words at the receive side. A DPCM coder comprising a respective quantizer for variable-length code words, a quantizer for code words having a fixed, below-average length, and a DPCM decoder comprising a code converter for variable-length code words and a code converter for code words having a fixed, below-average length are provided for this purpose. The type of conversion for the next PCM code word present at the input is selected after each conversion on the basis of the number of memory locations that still exist. This transmission system is suitable for data reduction, particularly of digital video signals.

REFERENCES:
patent: 3761613 (1973-09-01), Limb
patent: 4141034 (1979-02-01), Netravali et al.
patent: 4491953 (1985-01-01), Bellisio et al.
patent: 4517596 (1985-05-01), Suzuki
"Funkschau", 1973, No. 16, pp. 591-593.
"Review of the Electrical Communication Laboratories", vol. 27, No. 11-12, Nov.-Dec., 1979, pp. 1095-1112.

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