Baseband modulation system with improved ROM-based digital filte

Details Baseband modulation system with improved ROM-based digital filte Baseband modulation system with improved ROM-based digital filte

1990-05-25

1992-08-18

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

332103, 36472404, H04L 2718

Patent

active

051406136

ABSTRACT:
In a conventional ROM-based digital filtering methodology, N past samples of M-bit input symbols are used to address a memory containing a desired filtered output signal. This memory must have an address space of 2.sup.M*N. According to the present invention, a desired filtered output signal is defined as a composition of signal terms, each of which is a function of less than M*N bits. Individual ROMs are provided for each of these component terms. Address bits for the ROMs are derived from the N past samples of the M-bit input symbols. The ROM outputs are combined to yield the desired filtered output signal.

REFERENCES:
patent: 4680556 (1987-07-01), Nakamura et al.
patent: 4757519 (1988-07-01), Collison et al.
patent: 4764940 (1986-11-01), Paneth et al.
patent: 4961206 (1990-10-01), Tomlinson et al.
Lathi, "Modern Digital and Analog Communication Systems", 2d Ed., 1989, The Dryden Press, pp. 251-253.

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