Patent ID: 6778589
Filing Date: 2004-08-17
Classification: H04B

Abstract:
A symbol synchronous device that receives a synchronous signal at a signal point with a different phase degree to a carrier, said synchronous signal in which a phase rotational direction is reversed to said carrier, and then produces a decision timing in synchronous with a symbol of a digital-modulated signal, comprising:reverse timing detection means for detecting a reverse timing at which the rotational direction of a phase angle of said digital-modulated signal is reversed; and clock signal output means for outputting a clock signal providing said decision timing in synchronous with said reverse timing, wherein said reverse timing detection means detects said reverse timing based on the phase angle of said digital-modulated signal with respect to a reference frequency signal, and said clock signal output means for outputting produces a pulse signal and controls the oscillation frequency of said pulse signal according to an integration value of phase errors between said pulse signal and a reference pulse signal reversed at said reverse timing, thus outputting said clock signal in synchronous with said reverse timing.