Telegraphy – Systems – Printing
Patent
1977-05-23
1978-12-19
Richardson, Robert L.
Telegraphy
Systems
Printing
325324, 178 88, 329 50, H04B 116
Patent
active
041308069
ABSTRACT:
A digital filter and demodulation arrangement for passband signals, whose corresponding baseband signal has a bandwidth limited to a given maximum frequency. The passband signals are filtered according to two bandpass characteristics which, apart from their asymmetrical distortion relative to their central frequency, are versions from one another shifted 90.degree. in phase. The filtered passband signals are demodulated with an in-phase carrier and a quadrature carrier and the demodulated signals are combined to a baseband signal.
In the digital filtering process the sampling frequency is reduced from a value higher than twice the highest frequency in the passband signals to a value which is not higher than twice said maximum frequency in the baseband signal and in the digital demodulation and combination processes the reduced sampling frequency is also used so that a considerable reduction in the internal processing speed is obtained.
REFERENCES:
patent: 3493876 (1970-02-01), Zimmerman
patent: 3525541 (1970-08-01), Gooding
patent: 3753115 (1973-08-01), Van Gerwen et al.
patent: 3971996 (1976-07-01), Motley et al.
Snijders Wilfred A. M.
Van Doorn Rudolf A.
VAN Essen Hendrik A.
van Gerwen Petrus J.
Briody Thomas A.
Ng Jin F.
Richardson Robert L.
Steckler Henry I.
Streeter William J.
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