Digital premodulation filter

Details Digital premodulation filter Digital premodulation filter

H - Electricity

04

L

332/27

H04L 27/12 (2006.01) H03H 17/02 (2006.01) H04L 27/20 (2006.01)

Patent

CA 1293778

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.

569102

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