Telecommunications – Receiver or analog modulated signal frequency converter – Carrier and single sideband
Patent
1996-10-16
1999-02-23
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Carrier and single sideband
455204, 455206, 455209, 455307, H04B 168, H04B 116
Patent
active
058753893
ABSTRACT:
An SSB radio receiver having an inexpensive wide-band IF filter which passes through not only a reception objective SSB station IF signal but also an interference SSB station IF signal simultaneously. These signals are SSB-detected to reproduce the original modulating audio signals with a BFO frequency, the BFO frequency itself located out of the pass-band of the wide-band IF filter. The frequency of the reception objective SSB station IF signal is selected to be nearest to the BFO frequency, preferably at an end of the pass-band width of the IF filter. Frequency spectrums of the SSB-detected audio signals are separated by a frequency difference comprising the difference between the BFO signal and the IF signals. The SSB-detected audio signals are applied to a selected low-pass filter, such as an inexpensive active filter, having a pass-band which covers or passes only the SSB-detected audio signal of the reception objective SSB station IF signal.
REFERENCES:
patent: 3100871 (1963-08-01), Richardson
patent: 3287645 (1966-11-01), Baghdady
patent: 4188579 (1980-02-01), Yoshisato
patent: 4313216 (1982-01-01), Jaeger et al.
patent: 4403348 (1983-09-01), Leland et al.
Armstrong Darnell R.
Eisenzopf Reinhard J.
General Research of Electronics Inc.
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