Modulators – Phase shift keying modulator or quadrature amplitude modulator
Patent
1994-10-18
1995-12-05
Grimm, Siegfried H.
Modulators
Phase shift keying modulator or quadrature amplitude modulator
332119, 375281, 375308, H04L 2720
Patent
active
054732905
ABSTRACT:
A variable-throughput digital modulator receives at an input a transmission digital signal e(t). The transmission digital signal is time-based demultiplexed (1) into first and second elementary transmission signals e1(t) and e2(t) which are applied, respectively, to first (21) and second (22) filtering circuits for delivering first and second filtered elementary signals e1f(t) and e2f(t). A circuit (20) provides throughput switching control to the first and second filtering circuits (21, 22) for selecting a first or second filtering mode corresponding to a first throughput at a first type of modulation or a second throughput at a second type of modulation. A quadrature modulator (3) receives the first and second filtered elementary signals in order to modulate an RDS-compatible carrier f0, and an output filter circuit (5) delivers a filtered modulated carrier signal for broadcast, such as in supplementary data broadcasting in FM radio broadcasting.
REFERENCES:
patent: 4965536 (1990-10-01), Yoshida
Patent Abstracts of Japan, vol. 8, No. 206 (E-267) 20 Sep. 1984 & JP-A-59 092 603 (Fujitsu K.K.) 28 May 1984.
Pignon Pascal
Scomazzon Pascal
Grimm Siegfried H.
Telediffusion de France
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