Signal detection apparatus for detecting digital information from a PCM signal

摘要

A signal detection apparatus detects digital information contained in a binary baseband PCM signal transmitted on a communication transmission channel or recorded on a recording medium. A first equalizer equalizes the PCM signal to reduce intersymbol interference. A clock reproducer reproduces a clock signal synchronized with the timing of the digital information using an output signal of the first equalizer. A second equalizer subjects the output signal of the first equalizer to partial response equalization. A decoding circuit decodes the digital information from an output signal of the second equalizer at a timing of the clock signal. A stable clock signal is easily reproduced and the digital information is detected at a lower bit error rate.