Digital AM demodulator, particularly for demodulating TV signals

摘要

A digital AM demodulator, particularly for demodulating a signal (x) originating from a tuner, comprising: means (13) for generating a first carrier ( omega at) which is not correlated with the input signal (x) to be demodulated; first means (3) for multiplying the first carrier ( omega at) by the input signal (x) to be demodulated; filtering means (1, 2), arranged upstream and downstream of said multiplier means (3) and adapted to eliminate unwanted spectral repeats; the particularity of which is the fact that it comprises means (15) for detecting the phase shift between the pulse ( omega i) of the input signal (x) to be demodulated and a local carrier ( omega ot) and means (18) for correlating the first carrier with the input signal, the first carrier and the local carrier being mutually correlated, the local carrier not being correlated with the input signal to be demodulated.