Method of, and demodulator for, digitally demodulating an...

Details Method of, and demodulator for, digitally demodulating an... Method of, and demodulator for, digitally demodulating an...

H - Electricity

03

D

329/1, 325/83

H03D 1/20 (2006.01)

Patent

CA 1293027

20104-8067 ABSTRACT A method of, and demodulator for, digitally demodulating an SSB signal. In the demodulator a band limited signal from a roofing filter is digitised in an ADC before being applied to quadrature related signal paths including mixers and low pass, decimating filters. The output from the decimating filters are applied to a Hilbert transform pair. The upper or lower sideband signal is obtained by adding (or subtracting) the outputs of the Hilbert transform pair. Thereafter the digital signal obtained is reconverted to an analogue signal. By choosing the decimation factor to be a numbered integer greater than 1, the periodic transfer function of the Hilbert transform pair has alternate passbands and stopbands. This relaxes the requirements on any analogue filters in the receiver and greatly enhances the adjacent channel selectivity of the receiver.

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