Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1983-01-20
1985-12-31
Miska, Vit W.
Communications: electrical
Audible indication
Percussion-type sound producer
332 9R, 375 27, H03K 1324, H03K 710
Patent
active
045624259
ABSTRACT:
To enable binary data to be differentially encoded into symbols (waves) for transmission the data is applied in n-bit data-words to produce symbols which, when displayed in a phasor-diagram, are in three groups in three 120.degree.-phase-sectors respectively, the number and dispositions of the symbols in the three sectors being the same. The encoding is such that, depending upon the data-word to be transmitted the sector in which a symbol is produced is rotated by 0.degree., 120.degree. or 240.degree. relative to the next preceding sector containing a symbol. In some embodiments one of the 2.sup.n possible different data-words is applied to produce an absolute symbol of zero amplitude. At a receiver the received symbols are decoded having regard to the 0.degree., 120.degree. and 240.degree. differential sector-rotations.
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IEEE Transactions on Communications, vol. COM-26, Mar., 1978, W. J. Weber, "Differential Encoding for Multiple Amplitude and Phase Shift Keying Systems", pp. 385-391.
CCITT-The International Telegraph and Telephone Consultative Committee, Yellow Book, vol. VIII, Fascicle VIII.1, "Data Communication over the Telephone Network", Recommendations of the V Series, Vth Plenary Assembly, Geneva, Nov. 10-21, 1980, Geneva, 1981, Recommendation V.29, 9600 Bits Per Second Modem Standardised for Use on Point-to-Point 4-Wire Leased Telephone-Type Circuits, pp. 165-177.
Bailey John W.
Parrish Henry H.
Turner Laurence F.
Miller Jerry A.
Miska Vit W.
Newton William A.
Racal-Milgo Limited
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