Signal processing system and method for digitally mixing a plura

Details Signal processing system and method for digitally mixing a plura Signal processing system and method for digitally mixing a plura

1996-12-26

2000-03-21

Chin, Stephen

Pulse or digital communications

Pulse code modulation

375247, 375248, 341110, 341143, 341146, 341155, 370537, 381119, 381 80, 708307, 708313, 708315, H04B 1404, H04B 1406, H03M 100, H03M 300

Patent

active

060410809

ABSTRACT:
A signal processing system receives and mixes a plurality of analog input signals having a maximum frequency. Each analog input signal is connected to an input of a modulator producing a high frequency oversampled digital signal. Each high frequency oversampled signal is connected to an input of a first decimation filter which produces an intermediate frequency oversampled multiple bit signal. Each of the intermediate frequency oversampled signals is connected to a respective input of a first digital mixer which produces a single mixed multiple bit output signal. The single mixed multiple bit output signal is connected to a second decimation filter which produces a final digital output signal, at a frequency suitable for representing the mixed analog input signals.

REFERENCES:
patent: 4993073 (1991-02-01), Sparkes
patent: 5208594 (1993-05-01), Yamazaki
patent: 5621345 (1997-04-01), Lee et al.
patent: 5621805 (1997-04-01), Loh et al.
patent: 5627536 (1997-05-01), Ramirez
patent: 5734683 (1998-03-01), Hulkko et al.
patent: 5736950 (1998-04-01), Harris et al.
French Search Report from French Patent Application No. 95 15861, filed Dec. 29, 1995.

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