Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1984-06-25
1986-04-08
Shoop, Jr., William M.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, 375 94, H03M 700
Patent
active
045816018
ABSTRACT:
A stream of binary bits is converted into blocks of eight parallel bits. A first group of five of the eight bits addresses a memory device which has thirty-two code words each having four numbers representing the coordinates of signal points in four-dimensional space. The remaining three of the eight bits are expanded to four bits by a convolutional encoder having three bits of memory. These four bits are then used to multiply the four numbers of a code word read out from the memory device. This method permits a block of eight binary bits to be coded into any one of five hundred and twelve four-dimensional code words.
REFERENCES:
patent: 3909721 (1975-09-01), Bussgang et al.
patent: 4077021 (1978-02-01), Csajka et al.
patent: 4084137 (1978-03-01), Welti
patent: 4247944 (1981-01-01), Sifford
S. M. Bergmann and D. P. Taylor, "Error-rate for the 9600 Bps signalling configuration of the V29 modem". Canadian Elec. Eng. J. vol. 6, No. 1, 1981, pp. 16-19.
"The Viterbi Algorithm", by G. D. Forney Jr., Proceedings of the IEEE, Mar. 1973, vol. 61, No. 3, pp. 268-278.
"Channel Coding with Multilevel/Phase Signals", by G. Ungerboeck, IEEE Transaction on Inform. Theory, Jan. 1982, vol. 1T-28, pp. 55-67.
"PCM/FDMA Satellite Telephony with 4-Dimensionally-Coded Quadrature Amplitude modulation", by Welti, COMSAT Tech. Review, vol. 6, No. 2, 1976, pp. 323-338.
"Four-Dimensional Modulation and Coding: An Alternate to Frequency-Reuse", by Wilson et al. Research Lab. for Eng. Science, U. of Virginia, Sep. 1983, No. UVA/532422/EE84/102.
"Efficient Modulation for Band-Limited Channels", by Forney et al., IEEE Trans. on Communications, July 1984 (special edition to be issued).
"Efficient Modulation for Bank-Limited Channels", by G. D. Forney, Jr., et al. IEEE Jour. on Selected Areas in Com., vol. SAC-2, No. 5, Sep. 1984, pp. 632-647.
Calderbank Arthur R.
Sloane Neil J. A.
AT&T Bell Laboratories
Bergmann Saul M.
Nimtz Robert O.
Roberts Patrick E.
Shoop Jr. William M.
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