Clock extracting circuit in digital-line signal receiver

Abstract From the Canadian patent

A clock extractor which generates a clock signal for sampling of a data signal received from a digital line on the basis of a separation clock having a period corresponding to a data communication rate of a data to be separated from the received data signal. The clock extractor always generates a plurality of clock signals which have respectively an identical period corresponding to a data communication rate of the received data signal and which phases are slightly shifted mutually and each time, selects one of the plurality of clock signals as a clock signal for sampling of the received data signal. In the selecting operation of the clock extractor a change in the, logical level of the …