Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1980-05-01
1982-03-30
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
340753, G11B 2736, H05B 3700
Patent
active
043227589
ABSTRACT:
This invention pertains to a fluorescent indicator adapted to indicate a level of a signal to be measured in an acoustic instrument and/or a vertical condition of a magnetic head in a multi-channel tape recorder.
The fluorescent indicator comprises a fluorescent indicating tube having a plurality of segment anodes arranged in a row from a lowest level side to a highest level side, pulse generator means to generate clock pulses having the number of pulses corresponding to the level of a signal, and counter means including a plurality of output terminals connected to the respective segment anodes to have output signal sequentially generated corresponding to the count of the clock pulses to operate the segment anodes of the fluorescent indicating tube. The fluorescent indicating tube starts to be operated on starting to count the clock pulses and the segment anodes of the fluorescent indicating tube are sequentially operated from the lowest level side toward the highest level side as the signal level becomes higher. The fluorescent indicator may be applied to a tape recorder having a multi-channel magnetic head and may further comprise a phase difference detector to electrically detect a phase difference between playback outputs of the two different channels on the magnetic head, and the output of the phase difference detector being adapted to operate one of the segment anodes of the fluorescent indicating tube corresponding to the phase difference of the playback outputs.
REFERENCES:
patent: 3967158 (1976-06-01), Saxon
patent: 4062047 (1977-12-01), Scull
patent: 4187505 (1980-02-01), Morley et al.
patent: 4224616 (1980-09-01), Kamagata et al.
Kobayashi Kozo
Ohya Hiroshi
Canney Vincent P.
Nakamichi Corporation
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