Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1975-11-10
1976-10-19
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
179 15BM, 325 39, 332 18, 332 21, 332 11R, H03C 302, H04J 304, H04J 900
Patent
active
039873749
ABSTRACT:
A multi-line multi-mode modulator uses compatible digital modulation techniques for multifrequency (MF), frequency shift keyed (FSK) and differential phase shift keyed (DPSK) modulation to achieve a multi-line multi-mode modulator which is capable of handling a plurality of lines requiring a dynamic mix of the three modulation techniques. The compatible modulation techniques utilize bandwidth reduction schemes which enable the use of simple RC filters on each output line for the sole purpose of removing the quantizing noise introduced by the digital modulation technique.
REFERENCES:
patent: 3611209 (1971-10-01), Saltzberg
patent: 3697892 (1972-10-01), Lawrence et al.
patent: 3828279 (1974-08-01), Labarber et al.
Frisone John B.
Grimm Siegfried H.
International Business Machines - Corporation
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