A method of tracing by non-acoustic media signals of interference at least partly pulsatory (Machine-translation by Google Translate, not legally binding)

摘要

A method of tracing by non-acoustic means interference signals at least in large part, pulsating, in record carriers provided with audio signals, the leading and trailing edges of the interference signals being substantially symmetric with respect to their extreme values, characterized in that the record carrier is scanned in the reverse direction and that the resultant signal voltages including the interference signal are applied to a device containing media which only pass the frequency range characteristic of the interference signals, and means responsive to the difference in the rise time of the leading edges of the interference signals and the leading edges of the signals useful in the reverse direction of movement of the record carrier. (Machine-translation by Google Translate, not legally binding)