| 摘要 |
PURPOSE:To reproduce a digital signal stably, by detecting only DC components of the discrimination output of a frequency discriminator and synthesizing this detection output and the discrimination output to compensate the variance of the DC center of the frequency discriminator. CONSTITUTION:The signal of an intermediate frequency converted by a frequency converter 11 is applied to a frequency discriminator 14. At this time, the intermediate frequency is varied by the variance of a transmission frequency, and the DC component of the discrimination output of the frequency discriminator 14 is varied. This variance of the DC component, namely, the variance of the DC center is detected by a signal detector 15, and the synthesizing processing is performed in an adder 17 so that the variable DC component is suppressed. Consequently, the output signal has the DC center fixed against the variance of the transmission frequency, and errors are not generated in code discrimination. |
