Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1989-06-13
1991-02-05
Strecker, Gerard R.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455254, 455260, 455264, 455316, H04B 116, H04B 126
Patent
active
049912267
ABSTRACT:
An FM detection system receives an FM input signal containing a plurality of carrier bands, including a tuned carrier band. The tuned carrier band is separated from side carrier bands by a frequency guard band. A detected, demodulated output signal is fed back to at least one local oscillator, which generates corresponding local FM signals having a deviation which is in phase with the deviation of the tuned carried. The FM input signal and the local FM signal are inputs to a guard band expansion device. The guard band expansion device includes a harmonics generator which produces an output spectrum which is a multiple of its input spectrum. In one embodiment, the harmonics generator operates directly on the FM input signal, its output signal then being beat by a mixer with the local FM signal. In another embodiment, the operations of harmonics generation and mixing are reversed. In all embodiments, the guard band separating the detected tuned carrier from side carriers is much greater than the input frequency guard band. In other embodiments, a plurality of mixers, oscillators, and/or harmonics generators is used to achieve high-order guard band expansion.
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Kuntz Curtis
Strecker Gerard R.
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