Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of biasing or erasing
Patent
1985-01-16
1986-12-02
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of biasing or erasing
360 46, G11B 503, G11B 509
Patent
active
046269347
ABSTRACT:
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.
REFERENCES:
patent: 2894796 (1959-07-01), Reynolds
patent: 4244009 (1981-01-01), Satoh
patent: 4470085 (1984-09-01), Kanayama
Hirota Akira
Ota Yoshihiko
Ozaki Hidetoshi
Tsuruta Masahiko
Yoshida Masajhi
Canney Vincent P.
Victor Company of Japan Ltd.
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