Radio receiver with quadrature demodulation and digital processi

Details Radio receiver with quadrature demodulation and digital processi Radio receiver with quadrature demodulation and digital processi

1982-09-08

1984-09-04

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

329 1, 329 50, 328109, H03D 300, H03D 500

Patent

active

044701470

ABSTRACT:
A multi-mode radio receiver divides the radio frequency input into two channels and in each channel mixes it with the carrier wave frequency. A quadrature shift in the mixing carrier wave frequencies enables base band signals to be filtered from the mixer outputs. The analogue quadrature signals are converted to digital form and processed digitally to reproduce the original modulating signal for am, fm or pm transmissions. For ssb modulation the mixing frequency is the side band center frequency instead of carrier frequency.

REFERENCES:
patent: 3426281 (1969-02-01), Klein
patent: 3646448 (1972-02-01), Harmon, Jr. et al.
patent: 3669511 (1972-06-01), Motley et al.
patent: 3787775 (1974-01-01), Lanning
patent: 4004226 (1977-01-01), Qureshi et al.
patent: 4090145 (1978-05-01), Webb

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