Digital demodulation method and device for frequency modulation and amplitude modulation signals
A frequency modulation signal and amplitude modulation technology, which is applied to amplitude modulation oscillation demodulation components and other directions, and can solve the problems of low demodulation accuracy, inability to effectively obtain carrier model parameters, and resolution that cannot be lower than the carrier period.
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[0048] A digital demodulation method for frequency modulation and amplitude modulation signals, the specific steps are:
[0049] 1) Perform signal conditioning on the frequency modulation signal or amplitude modulation signal to be tested, use the analog-to-digital conversion circuit to sample the conditioned signal, and convert the sampled waveform data sequence y i , i=1, 2,..., n is sent to the computer, wherein i represents the sampling point serial number in the synchronous sampling sequence;
[0050] The sequence length n and sampling rate v of the analog-to-digital conversion circuit acquisition waveform are set according to the carrier frequency of the measured modulation signal, and the setting principle is to ensure that there are more than 20 sampling points in each carrier waveform cycle;
[0051] 2) Firstly, at the leading edge of the waveform acquisition sequence, intercept less than one carrier period containing m 1 The waveform segment data sequence y of sampl...
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