DEMODULATOR FOR DIGITAL MODULATION SIGNAL

PURPOSE:To realize the demodulator for a digital modulation signal with less data discrimination error and employing a frequency detector and an integration discharge filter. CONSTITUTION:A frequency detector 1 detects a frequency of a digital modulation signal. An integration discharge filter 2 integrates a frequency detection output from the frequency detector 1 for a prescribed time. A discriminator 3 discriminates a data by using a phase difference signal from the integration discharge filter 2 as a discrimination input to output the discrimination data being the result of discrimination as a demodulation data. A feedback means extracts a phase error of a discrimination input, multiplies the error with a multiple of a constant number and feeds back it to a succeeding discrimination input as a noise correction quantity.