Filter and demodulation arrangement

Details Filter and demodulation arrangement Filter and demodulation arrangement

H - Electricity

04

B

329/3, 328/0.1

H04B 1/16 (2006.01) H03D 3/00 (2006.01) H03D 5/00 (2006.01) H04L 27/06 (2006.01) H03D 7/16 (2006.01)

Patent

CA 1089028

ABSTRACT: A digital filter and demodulation arrange- ment for passband signals, whose corresponding baseband signal has a bandwidth limited to a given maximum fre- quency. The passband signals are filtered according to two bandpass characteristics which, apart from their asymmetrical distortion relative to their central fre- quency, are versions from one another shifted 90° in phase. The filtered passband signals are demodulated with an in-phase carrier and a quadrature carrier and the demodulated signals are combined to a baseband signal. In the digital filtering process the sampling frequency is reduced from a value higher than twice the highest frequency in the passband signals to a value which is not higher than twice said maximum frequency in the baseband signal and in the digital demodulation and combination processes the reduced sampling frequency is also used so that a considerable reduction in the inter- nal processing speed is obtained.

279169

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