Method and apparatus employing a pulsed carrier in generating si

Details Method and apparatus employing a pulsed carrier in generating si Method and apparatus employing a pulsed carrier in generating si

1977-07-21

1978-11-28

Claffy, Kathleen H.

H04J 106

Patent

active

041277465

ABSTRACT:
In the transmit circuits of one terminal, a high frequency (HF) sinusoidal carrier signal of frequency f.sub.c is combined with a low frequency (LF) pulse signal having a PRF f.sub.p to produce a pulsed carrier signal having a plurality of component frequencies af.sub.c .+-. bf.sub.p. The pulsed carrier is modulated in each voice channel by an associated voice signal to produce sidebands of the HF component frequencies there. A different sideband is selected at HF for each channel by polylithic crystal bandpass filter. The selected HF sidebands are then combined with the carrier signal to translate them to low frequencies for subsequent transmission.

REFERENCES:
patent: 3859469 (1975-01-01), Getgen
GTE Lenkurt Demodulator, Sept. 1973, "FDM Modulation Plans and Polylithic Crystal Filters", pp. 6-7.

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