Tuner

Details Tuner Tuner

2005-05-24

2008-03-11

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S188200, C455S260000, C455S339000, C455S341000

Reexamination Certificate

active

07343142

ABSTRACT:
A digital terrestrial tuner has an RF input connected to a filter arrangement, whose output signal is supplied to a zero intermediate frequency frequency changer. The filter arrangement comprises a plurality of signal paths of different frequency responses. The signal paths are selectable one at a time for insertion between the tuner input and the frequency changer. At least one of the signal paths comprises a non-tracking filter which provides attenuation of out-of-band signals so as to reduce harmonic mixing caused by harmonics of the frequency changer commutating signal or by harmonics of spurious signals at lower frequencies.

REFERENCES:
patent: 6944427 (2005-09-01), Haub et al.
patent: 2002/0151287 (2002-10-01), Lindquist et al.
patent: 2005/0048928 (2005-03-01), Jeon et al.
patent: 2006/0019604 (2006-01-01), Hasarchi
patent: 2006/0246842 (2006-11-01), Mohindra
patent: 1 594 632 (1981-08-01), None

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