Television – Basic receiver with additional function – Multimode
Patent
1997-01-31
2000-10-03
Powell, Mark R.
Television
Basic receiver with additional function
Multimode
348553, 348558, 348723, 348726, H04N 544
Patent
active
061280437
ABSTRACT:
A multi-standard receiver is which is particularly suited for reception of B/G-PAL and D/K-PAL TV signals. In the receiver, a tuner (TUN) selects a desired TV signal which is passed to a multi-standard demodulator (DEM) via an intermediate-frequency filter circuit (IFF). To obtain good performance, particularly in view of EN 55020 requirements, at moderate costs, the intermediate-frequency filter circuit (IFF) includes a main filter (FIL1) and an auxiliary filter (FIL2). The main filter (FIL1) may have a relatively narrow band, for example, just capable of passing a full B/G-PAL TV IF signal to the demodulator circuit. For D/K-PAL reception, the auxiliary filter (FIL2) is effectively switched (SW) in parallel with the main filter (FIL1). The auxiliary filter (FIL2) transfers the D/K-PAL sound carrier to the demodulator circuit (DEM), which transfer is not possible via the relatively narrow-band main filter (FIL1).
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Biren Steven R.
Powell Mark R.
Sajous Wesner
U.S. Philips Corporation
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