Periodic clock pulse producing device, has comparator outputting signal level at output, when band-pass filtered signal exceeds reference level, and outputting another level at output, when filtered signal falls below reference level

摘要

The device has a band-pass filter (30), which has an input for receiving an input signal and an output for outputting a band-pass filtered signal. A comparator (40) has an input for receiving the band-pass filtered signal and an output for outputting a clock pulse. The comparator is designed to output a signal level at the comparator output, when the band-pass filtered signal exceeds a reference level, and to output another signal level at the comparator output, when the band-pass filtered signal falls below the reference level. An independent claim is also included for a method for producing a periodic clock pulse.