Telecommunications – Transmitter and receiver at separate stations – With control signal
Patent
1978-06-30
1983-06-14
Psitos, Aristotelis M.
Telecommunications
Transmitter and receiver at separate stations
With control signal
358 36, 358167, 370 7, 333 14, 328169, H04B 164, H04N 521, H04J 318, H04B 164
Patent
active
043887295
ABSTRACT:
Noise reduction of a signal such as a video signal is effected by averaging a plurality of relatively delayed replica signals, e.g. with line or field delays therebetween, in a decoding processor, the highly redundant information content of the signal being reinforced by the averaging while random noise undergoes a partial cancellation. In order to overcome the problem of signal changes caused by the decoding processor, the signal is encoded prior to application to the noise-introducing signal channel by a complementary encoding processor in which one or more replica signals are subtractively combined with one or more other replica signals. In both processors a variable combining means is employed to exclude from the combination replica signals which have a non-small difference from the replica signals in the combination, thereby to avoid smearing of the information content (with consequent picture smearing in the case of a video signal) when the signal is changing, e.g. because of movement in a picture.
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Dolby Ray M.
Spencer Paul A.
Dolby Laboratories, Inc.
O'Connell Robert F.
Psitos Aristotelis M.
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