Modem tuner

Details Modem tuner Modem tuner

2001-10-24

2008-09-02

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Receivers

C375S377000, C348S729000, C455S324000

Reexamination Certificate

active

07421040

ABSTRACT:
A tuner includes a mixer which receive first and second inputs via a multiplexer in different frequency ranges from different sources such as cable and satellite. A local oscillator supplies signals via a bandswitch which switches the local oscillator frequency range in synchronism with the selection of inputs by the multiplexer. The mixer converts the selected incoming data stream to zero or near-zero intermediate frequency and this signal is filtered exclusively by a variable bandwidth low-pass filter before being converted to the digital domain and demodulated.

REFERENCES:
patent: 4162451 (1979-07-01), Ash
patent: 4162452 (1979-07-01), Ash
patent: 4340975 (1982-07-01), Onishi et al.
patent: 2003/0133049 (2003-07-01), Cowley et al.
patent: 2223900 (1990-04-01), None

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