Waveform equalizing filter unit.

摘要

A waveform equalizing filter unit of a simplified circuit configuration for use in a MUSE decoder or the like. The filter unit comprises a waveform equalizing filter with a plurality of taps each having a unitary delay element and a coefficient multiplier; a clock switching circuit for selecting one of clock signals of at least two different frequencies inputted thereto, and outputting the selected clock signal to the unitary delay elements of the waveform equalizing filter; and a control means for selectively switching the tap coefficients of the coefiicient multpliers in the waveform equalizing filter in accordance with the operation of switching the clock signals by the clock switching circuit. A signal timing adjuster is further included in a stage anterior to the waveform equalizing filter so as to adjust the timing to switch the input signal in synchronism with the clock switching operation. In such constitution, optimal signal waveform equalization conforming to each distortion characteristic can be achieved in a simplified circuit configuration by selectively switching both sampling rates and tap coefficients of a single waveform equalizing filter in accordance with the distortion characteristic. <IMAGE>