Modulators – Amplitude modulator – Plural modulation
Patent
1990-12-07
1991-12-31
Grimm, Siegfried H.
Modulators
Amplitude modulator
Plural modulation
332167, 332170, 329348, 329356, 329357, 329360, 455 46, 455 47, 455 70, 455109, 358 23, H03C 152, H03D 102, H04N 540
Patent
active
050775421
ABSTRACT:
A system of transmission with amplitude modulation for the transmission of signals of all types, analog and/or digital, requiring high performance characteristics with respect to the noise induced by the transmission channel, comprising, at transmission, means for the suppressed carrier amplitude modulation of a useful signal and means for the amplitude modulation, in phase quadrature with said modulated useful signal, of a service signal, making it possible, at reception, to remove the ambiguity on the polarity of the demodulated useful signal. Thus it enables the transmission of signals in suppressed carrier modulation mode, hence with a good signal-to-noise ratio, without losing the polarity of the signal. The transmitters and receivers according to the invention also enable the transmission and reception of the signals modulated in SCAM, VSBAM or VSBSCAM modes.
REFERENCES:
patent: 3566036 (1971-02-01), Roche et al.
patent: 3895298 (1975-07-01), Schollmeier
patent: 4618996 (1986-10-01), Rafal et al.
Grimm Siegfried H.
L'Etat Francais (CNET)
Telediffusion de France S. A.
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