Quadriphase phase modulation system

Details Quadriphase phase modulation system Quadriphase phase modulation system

1986-10-27

1988-11-22

Laroche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

375122, H03C 300

Patent

active

047868821

ABSTRACT:
A quadriphase phase modulation system having a serial to parallel converter for converting first symbols of two-bit serial data into second symbols of two-bit parallel data, a circuit for generating waveform information in response to the second symbols, a memory for storing basic waveforms and a connection waveform and for reading out basic and connecting waveforms in response to the received waveform information. The basic waveform information is selected on the basis of the present waveform information and the connecting waveform is selected on the basis of the present waveform information and the immediately preceding waveform information. A digital to analog converter converts the basic and connecting waveforms output by the memory means into an analog signal.

REFERENCES:
patent: 3913093 (1975-10-01), De Vincentiis et al.
patent: 4567602 (1986-01-01), Kato et al.

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