Multi-channel tuner using a discrete cosine transform

Multiplex communications – Communication over free space – Repeater

Reexamination Certificate

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Reexamination Certificate

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07054281

ABSTRACT:
A satellite receiver includes a multi-channel tuner for processing a plurality of different transponder signals to simultaneously provide a plurality of different bit streams from at least two of the transponder signals. The multi-channel tuner includes (a) a demultiplexer for demultiplexing a received signal representing the plurality of transponder signals into a plurality of sample signals, each transponder signal conveying a bit stream, (b) a plurality of bifurcated filters operative on the plurality of sample signals for providing a plurality of filtered signals, and (c) a discrete cosine transform element operative on the plurality of filtered signals for simultaneously providing at least two of the bitstreams.

REFERENCES:
patent: 5278837 (1994-01-01), Kelley
patent: 5629736 (1997-05-01), Haskell et al.
patent: 5684829 (1997-11-01), Kizuki et al.
patent: 5870402 (1999-02-01), Kelley
patent: 6449244 (2002-09-01), Loseke
patent: 6473409 (2002-10-01), Malvar
Gilbert Strang et al., “Wavelets and Filter Banks,” Wellesley-Cambridge Press, 1997, pp. 263-336.

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