Combined TV/FM receiver

Details Combined TV/FM receiver Combined TV/FM receiver

1995-12-20

1998-01-20

Crosland, Donnie L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551891, 4551801, 4551803, 4551831, 455260, 348729, 348735, H04B 118, H04N 546

Patent

active

057109931

ABSTRACT:
An arrangement for receiving both TV and FM broadcast signals, particularly suited for multi-media applications. In the arrangement, a standard TV tuner (TUN) effects a first frequency conversion of an FM broadcast signal. A combination of a mixer (MP2) and an oscillator (VCO) effects a second frequency conversion of the FM broadcast signal. In order to keep the arrangement relatively simple, the oscillator (VCO) is included in a phase-lock loop (PLL), which is used for synchronous detection of a TV intermediate frequency signal. The phase-lock loop (PLL) includes a switch (SW) for deactivating the phase-lock loop (PLL) in the case of FM broadcast signal reception, such that the oscillator (VCO) is effectively free running.

REFERENCES:
patent: 4272788 (1981-06-01), Ogita
patent: 4596963 (1986-06-01), Lawton et al.
patent: 4823399 (1989-04-01), George
patent: 4855835 (1989-08-01), Tobita
patent: 5144439 (1992-09-01), Wignot

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