Modulators – Frequency shift keying modulator or minimum shift keying...
Patent
1993-10-01
1995-01-17
Grimm, Siegfried H.
Modulators
Frequency shift keying modulator or minimum shift keying...
332101, 375 45, 375 62, H04L 2712
Patent
active
053829247
ABSTRACT:
A modulator is adapted for use in a transmitter of an information transmission signal in which the information is in the form of a frequency shift keyed code. The signal is centered on a fictional carrier frequency fc, on either side of which are emitted two actual frequencies separated from the frequency fc by .DELTA.f, according to whether the binary information has a high value (+1) or a low value (-1). A first generator (1) creates carrier signals in the form of sin(2.pi.f.sub.c t) and cos(2.pi.f.sub.c t). A second generator (6) creates, as a function of the information, modulation signals of the form sin(2.pi..DELTA.ft) and cos(2.pi..DELTA.ft) which are mixed with the carrier signals. At each transition of the information, first phase shifting means (8,14) modify by k.pi. the phase of one of the modulation signals. Second phase shifting means (8,9,10,12), simultaneously with the action of the first phase shifting means and at each transition of the information, change the sign of the argument of the modulation signals. The carrier signal is thus devoid of phase jumps.
REFERENCES:
patent: 4748641 (1988-05-01), Dapper
patent: 4897620 (1990-01-01), Paradise
Gerrits John F. M.
Pardoen Matthijs D.
CSEM - Centre Suisse d'Electronique et de Microtechnique SA
Grimm Siegfried H.
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