Modulated passband signal generator

Details Modulated passband signal generator Modulated passband signal generator

1975-12-01

1977-03-29

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

178 66A, 325141, 325161, 325164, 332 16R, 332 21, 332 22, 332 23R, H03C 300

Patent

active

040152227

ABSTRACT:
Disclosed is apparatus for generating carrier signals modulated by baseband symbol signals. The disclosed apparatus includes samplers for sampling input symbol signals, multipliers for multiplying the sampled signals by a precessing phase that is a function of the carrier signal's frequency, and modified filters for convolving the multiplied signals with a complex (real and imaginary) low pass impulse response and for selecting the real part of the convolved signals.

REFERENCES:
patent: 3671670 (1972-06-01), Saltzberg
Choquet et al., "Microcoded Modem Transmitters," IBM Journal of Research and Development, July, 1974, pp. 338-351.
Kalet et al., "In-Band Generation of Synchronous Linear Data Signals" IEEE Transactions on Communications, vol. COM-21, Oct. 1973, pp. 1116-1122.

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