Digital premodulation filter

Details Digital premodulation filter Digital premodulation filter

1987-10-02

1988-07-12

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 17, 375 62, 375 67, 332 1, 455 93, H03C 308

Patent

active

047575190

ABSTRACT:
A programmable premodulation filter having a finite impulse response to digitally filter a digital data signal to provide a modulation signal for modulating an RF carrier signal is described. A digital summer and accumulator are programmed to provide a finite impulse response to a bimodal impulse signal which represents the input digital data signal. Several impulse response functions g(t) are stored in a ROM (or RAM) and may be selected to reprogram the digital filter to provide a desired modulation format. When a RAM is used, additional impulse response functions may be input to the RAM and the stored impulse response functions may be dynamically modified to provide the desired modulation format.

REFERENCES:
patent: 3590384 (1971-06-01), Van Gerwen
patent: 3958191 (1976-05-01), Jones Jr.
patent: 4003001 (1977-01-01), Jones Jr.
patent: 4686490 (1987-08-01), Cressy

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