Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1983-02-18
1985-04-02
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
235310, H03K 1324
Patent
active
045090386
ABSTRACT:
A television system (for example) may transmit a stream of signals in the form of successive binary words. The signal transmission channel may be used much more efficiently if these binary words are compressed by a reduction of the signal bits before transmission or expanded after transmission in order to reconstitute the original signal. Regardless of why the signals are compressed, the invention improves the transmission quality by sending a combination of fixed length and variable length binary words. This is done by providing a fixed length signal converter in parallel with a variable length signal converter. A decision-making circuit separates the successive binary words responsive to logical decision-making rules relating to an average length word. A selector switch selects between the outputs of the two converters responsive to the logical decisions. Stated another way, one converter is used for signal words which are longer than average and the other converter is used for signal words which are shorter than average so that the combination causes all signals to have an average number of bits which is much less than the original number of bits.
REFERENCES:
patent: 3185823 (1965-05-01), Ellersick
patent: 3675211 (1972-07-01), Raviv
patent: 4177456 (1979-12-01), Fukinuki
Candy "The Bell System Technical Journal" vol. 50, No. 6, Jul.-Aug. 1971, pp. 1889-1917.
Fano "Transmission of Information-A Statistical Theory of Communication" The MIT Press, pp. 62-81, May 1966.
Atrubin "IBM Technical Disclosure Bulletin" vol. 14, No. 3, Aug. 1971, pp. 874-876.
TTL Bipolar Memory & Interface Circuits, 1st Ed. Texas Instruments.
Miller Charles D.
Nippon Electric Co. Ltd.
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