| 摘要 |
PURPOSE:To decide a synchronizing/asynchronizing state without any error even with a discrete input signal by using a sampling type loop filter and a sampling type low-pass filter in place of a conventional loop filter and low pass filter. CONSTITUTION:The sampling type low-pass filter 22 applies sampling filtering during a period when an input signal Sin exists and keeps the state just before while the input signal Sin does not exist. A conventional loop filter is used as the sampling loop filter 21 corresponding to the sampling low-pass filter 22, applies the filtering for a prescribed period only the same as the filter 22 and the state just before is kept as it is at no signal. As a result, a synchronizing detection signal Sdet is obtained independently of the time rate of the presence and absence of the input signal Sin. |
