Importance

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Abstract

A symbol synchronous device is provided that can maintain symbol synchronization in short time in response to synchronous signals. The symbol synchronous device receives a synchronous signal at a signal point with a different phase degree, the synchronous signal in which the phase rotational direction is reversed to said carrier, and then produces a decision timing in synchronous with a symbol of said digital-modulated signal. The differential output unit 9 and the decision unit 10 detect the reverse timing based on the phase angle .delta. of a digital-modulated signal with respect to the reference frequency signal. The phase angle is produced by the phase angle calculation unit 8. The XOR integration digital PLL 11 produces clock signals in synchronous with the reverse timing to provide the decision timing.

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First Claim