Timing clock signal reproducer with error signal generator - includes switch=off unit preventing integration of temporal error signal on basis of detected input abnormality

摘要

Incoming signals are digitised (100) to a fixed level (101) and mixed (102) with demodulation carrier signals (104) in quadrature to obtain a complex baseband signal (CRS), which is low-pass filtered (105), equalised (106) to compensate for transmission distortion, and compared (107) with a reference signal for decoding (CO). A timing error detector (200) is used with an integrator (201), frequency divider (202), oscillator (203), multiplier (211), another integrator (212), an adder (210), switch-off unit (300), control unit (301) and input abnormality detector (302). USE/ADVANTAGE - In facsimile or data transmission systems, rapid synchronisation between transmitter and receiver is reproducible even when the rhythm of timing varies markedly.