| 摘要 |
<p>Amplitude detector for signals having a periodical character, recorded on a recording medium, characterized by a first delay line and a second delay line, wherein an average maximum value of the detected signal is stored in the first delay line for each one of a predetermined number of detection instants within a detection period, and an average minimum value of the detected signal is stored in the second delay line for each one of said detection instants, means for determining an average level between the average maximum and minimum values for each detection instant on the basis of the output signals of the two dealy lines, and means for comparing the current signal to be detected for a given detection instant with the average level for said detection instant so as to provide a detection signal.</p> |
