Double conversion television tuner

Details Double conversion television tuner Double conversion television tuner

1996-09-23

2000-01-18

Burgess, Glenton B.

Television

Receiver circuitry

Tuning

348735, 4551891, 4551901, 4551921, 455209, H04N 550

Patent

active

060161701

ABSTRACT:
A double conversion television tuner capable of receiving analog and digital telecasts and having a reduced number of frequency conversion stages with fewer oscillators to minimize beat disturbances between local oscillation signals, the tuner being made up of fewer circuit components costing less than conventional tuners to manufacture. The inventive tuner comprises a first frequency conversion stage for converting in frequency a channel-select received signal to a first intermediate frequency signal to be output, a second frequency conversion stage for converting in frequency the first intermediate frequency signal to a second intermediate frequency signal to be output, and an analog and a digital demodulator for demodulating the second intermediate frequency signal. The local oscillation signal of the second frequency conversion stage is switched to a first frequency if the base-band signal of the channel-select received signal is an analog signal, and to a second frequency if the base-band signal is a digital signal, the second frequency being higher than the first frequency.

REFERENCES:
patent: 4395777 (1983-07-01), Oki et al.
patent: 4581643 (1986-04-01), Carlson
patent: 5311318 (1994-05-01), Dobrovolny
patent: 5418815 (1995-05-01), Ishikawa et al.
patent: 5598221 (1997-01-01), Miyahara et al.
patent: 5640213 (1997-06-01), Miyahara et al.

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