Demodulation technology null of the line type modulation data signal in the

摘要

(57) Abstract The receiver section the line type modulation data signal reconstructs in-phase and direct phase component. The in-phase signal is sampled, at the same time is quantized and forms in-phase sample stream, the direct phase signal is sampled, at the same time is quantized and forms the direct phase sample stream. As for in-phase sample stream and as for the direct phase sample stream, it is sampled overly at rate of the n-tuple of mark rate of the data signal. The decrease section, at rate of M times that below N of mark rate, putting in-phase sample stream and the direct phase sample stream on the filter, forms in-phase sample stream where the number of samples is decreased and the direct phase sample stream where the number of samples is decreased. The decisive section, with M where it corresponds to the sampling position of in-phase sample stream where the number of samples is decreased and the direct phase sample stream where the number of samples is decreased, calculates the total value of in-phase sample and the direct phase sample, using in-phase sample and the direct phase sample which are related to the sampling position which possesses maximum, forms in-phase mark stream and the direct phase mark stream.