DC Cancellation in ternary-coded data systems

Details DC Cancellation in ternary-coded data systems DC Cancellation in ternary-coded data systems

1982-12-06

1984-12-04

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

375 19, 370102, H03K 1300

Patent

active

044867409

ABSTRACT:
An encoder (100) for processing an input signal to produce a ternary coded data stream having supressed DC comprises circuitry, and its associated methodology, including an arrangement (120,130,150) for augmenting the data stream with a compensating set of code symbols as determined by the number of positive and negative code symbols in the data stream as well as all prior compensating code symbols. A decoder (200) processes the received signal to extract the symbols in the data stream corresponding to the input signal. In order to achieve a preselected end-to-end transmission rate with the encoder-decoder combination, the rate of the signal propagated between encoder and decoder is increased to compensate for the appended code symbols.

REFERENCES:
patent: 3504287 (1970-03-01), Deregrnaucourt
patent: 3611141 (1971-10-01), Waters
patent: 3631471 (1971-12-01), Griffiths
patent: 4071692 (1978-01-01), Weir
patent: 4255742 (1981-03-01), Gable
patent: 4310860 (1982-01-01), Leiner
patent: 4394641 (1983-07-01), Artigalas

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