Hitachi, Ltd.

Hitachi Communication Systems, Inc.

Norihumi Komatu

Yumiko Nishi

Yutaka Torii

Seiichi Takaki

A telephone exchange system has a plurality of bit synchronization circuit each provided for an individual subscriber's line. A single clock generating circuit which generates a plurality of clocks is provided in common to the plurality of bit synchronization circuits. The bit synchronization circuit selects one clock of a phase suitable for regenerating an input data signal among the plurality of clocks applied thereto by the clock generating circuit, and regenerates and phases the input data signal by using the selected clock.

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Yokohama, Japan

Norihumi Komatu