Demodulation and roll-off filter apparatus

Details Demodulation and roll-off filter apparatus Demodulation and roll-off filter apparatus

1993-03-10

1996-09-17

Chin, Stephen

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375350, H03D 100, H04L 2706, H04B 110

Patent

active

055576320

ABSTRACT:
A demodulation and roll-off filter apparatus comprises a demodulation portion, a decimation portion, a demodulation and roll-off filter portion, and a modulation portion. The demodulation portion converts a pass-band signal received from an A/D converter into a base-band signal. The decimation filter portion lowers the sampling frequency of the base-band signal into a frequency four times higher than the frequency of a demodulation carrier used for the demodulation and roll-off filter portion. The modulation portion converts a base-band signal received from the decimation filter portion into a pass-band signal. The demodulation and roll-off filter portion performs a simplified demodulation and roll-off filter process for the pass-band signal.

REFERENCES:
patent: 4607230 (1986-08-01), Kaku et al.

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