FM receiver method and system for weak microwave television sign

Details FM receiver method and system for weak microwave television sign FM receiver method and system for weak microwave television sign

1987-03-18

1990-04-17

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455208, 455258, 455207, 375 81, H04N 5455, H04B 110, H03D 324

Patent

active

049185322

ABSTRACT:
The threshold-extension receiving system combines parallel multiple direct-demodulating FM demodulators each demodulating the direct RF or IF signal, in conjunction with restricted bandwidth associated with each direct demodulator for removing the noise which is present from the band occupied at a given instant by a part of the modulated signal. Each FM direct-demodulator of the receiving system is tuned to a bandwidth centered on the instantaneous RF or IF frequency of a selected direct modulation component, rather than on the mid-frequency of the signal as a whole, such modulation component being treated as undergoing a relatively limited displacement within the total FM band occupied by the signal. The individual restricted bandwidths may be fixed or adaptively tuned. The individual direct FM components of an FM television signal are direct-demodulated by this system separately, rather than as a group, enabling a resultant lowering of overall FM threshold at which the receiver can operate properly, when the direct-RF or IF demodulated separated FM components are recombined to reconstruct a reproduced signal.

REFERENCES:
patent: 2510906 (1950-06-01), Reid
patent: 3544899 (1970-12-01), Gusyatinsky
patent: 4087756 (1978-05-01), Rogers
patent: 4293818 (1981-10-01), Jarger
patent: 4523324 (1985-06-01), Marshall
patent: 4672636 (1987-06-01), Marshall

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