Data communication system and modem therefor

Details Data communication system and modem therefor Data communication system and modem therefor

1992-06-03

1997-06-24

Chin, Stephen

Pulse or digital communications

Transceivers

Modems

375272, 375303, 375334, H04L 2710

Patent

active

056423802

ABSTRACT:
A system for the transmission of data, and a modem for use in such a system, utilize variable shift keying (VSK), in which a data signal is modulated to form a continuous phase signal in which successive symbols are represented by successive signal segments of constant phase angle, typically 180.degree. or one half cycle, different symbols being distinguished by the segments being of different duration, i.e. at different frequencies. The ratios of the frequencies may be chosen to facilitate signal modulation and demodulation, and to control the frequency spectrum of the transmitted signal. Each symbol may represent one or more bits of the data signal. The lengths of half cycles used to represent different symbols may be adjusted by introducing flat peaks into the half cycles whilst maintaining uniform the profile of their flanks so as to facilitate generation and reduce zero crossing detection jitter during reception.

REFERENCES:
patent: 4669095 (1987-05-01), Hall
patent: 4700364 (1987-10-01), Miyazaki et al.
patent: 4734920 (1988-03-01), Betts
patent: 4748640 (1988-05-01), Staley et al.
patent: 4780889 (1988-10-01), Ley
patent: 4882726 (1989-11-01), Lang
patent: 4894847 (1990-01-01), Tjahjadi
patent: 5001729 (1991-03-01), Tjahjadi
patent: 5038365 (1991-08-01), Belloc
patent: 5103463 (1992-04-01), Schoeneberg
patent: 5105444 (1992-04-01), Gard
`Component Data Book`, Zilog Corporation, 1983-84 Edition, pp. 71-86.

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