Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1992-08-21
1994-08-30
Zazworsky, John
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
328167, 455 33, 455 51, 348 6, H04N 100, H04N 710, H04H 106
Patent
active
053431588
ABSTRACT:
The device comprises a first path provided with an amplifier (1) amplifying in a first frequency band, and a second path provided with an amplifier (2) amplifying in a direction opposite to that of the first amplifier and in a second frequency band other than the first frequency band, a first filter element (L1) having a low pass characteristic for transmitting the signals of the first path, and a second filter element (C1) having a high pass characteristic for transmitting the signals of the second path. The two paths are combined by a third filter element (CA) having a high pass characteristic, arranged in series with a fourth filter element (LA) having a low pass characteristic, whose junction point is connected to ground by a matched impedance (ZCA), and a signal polarity inverting element (TA) is inserted in series between two of the filter elements.
REFERENCES:
patent: 1743691 (1925-06-01), Shea
patent: 2974188 (1961-03-01), Diambra
patent: 3806813 (1974-04-01), Eller
patent: 4077006 (1978-02-01), Nicholson
patent: 4982440 (1991-01-01), Dufresne et al.
Charpail Francois
Gris Joel
Kraus Robert J.
U.S. Philips Corporation
Zazworsky John
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