Cue signal recording circuit for magnetic recording and reproducing apparatus

摘要

A cue signal recording circuit for a magnetic recording and reproducing apparatus comprises an erase signal generator for generating an erase signal having a relatively high frequency, a symmetry varying circuit responsive to a first external signal having a relatively low frequency for varying the symmetry of the waveform of the output erase signal of the erase signal generator at the relatively low frequency, a switch having a first input terminal applied with the output erase signal of the erase signal generator and a second input terminal applied with an output signal of the symmetry varying circuit, where the switch is connected to the second input terminal so as to pass the output signal of the symmetry varying circuit for a predetermined short time period and is thereafter connected to the first input terminal so as to pass the output erase signal of the erase signal generator responsive to a second external signal, and an erase head supplied with the output signal of the switching for recording on a magnetic tape a signal having the relatively low frequency as a cue signal for the predetermined short time period and thereafter erasing pre-recorded signals on the magnetic tape.