Simultaneous amplitude and angle modulation using detection of c

Details Simultaneous amplitude and angle modulation using detection of c Simultaneous amplitude and angle modulation using detection of c

1982-09-20

1985-06-04

Laroche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 23R, 332 31R, 329 50, 329122, 329124, 329135, 329142, 455108, 455337, H03C 100, H03C 300, H03D 500

Patent

active

045217491

ABSTRACT:
Modulation of a carrier signal using both amplitude and angle modulation increases the information capacity of transmission without increasing bandwidth. Complex zeros in an amplitude modulating signal are detected and a conjugation function dependent on the time of occurrence and imaginary root values of the zeros is generated. The conjugation function is inverted or not inverted in accordance with a binary data signal and used to control the frequency of an oscillator whose output is an angle modulated carrier signal which is then amplitude modulated. On reception the amplitude modulating signal is recovered by an envelope detector and the data signal by a phase locked loop.

REFERENCES:
patent: 4199821 (1980-04-01), Munday
patent: 4404532 (1983-09-01), Weltz
patent: 4466109 (1984-08-01), Sari
patent: 4476577 (1984-10-01), Matzold et al.

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