Dynamic magnetic information storage or retrieval – Recording or reproducing plural information signals on the...
Patent
1979-08-06
1983-05-10
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Recording or reproducing plural information signals on the...
370 691, 375 21, 360 20, G11B 502, H04J 102, H04L 900
Patent
active
043832806
ABSTRACT:
A recorder apparatus comprises a modulator, arranged to be fed with a carrier signal of a frequency at the low end of the audio spectrum (e.g. 80 Hz), for pulse modulating said signal with serialized data corresponding to a time code. A voltage controlled amplifier is connected to the output from the modulator and controlled by an amplitude detector in a separate audio component channel. A mixer is arranged to mix the output from the voltage controlled amplifier and the second audio component channel for feeding to a record head. A play back apparatus which may be integral with the recorder apparatus comprises a low pass filter and a high pass filter arranged to be fed with signals from a read head. A decoder is connected to receive signals from the low pass filter via demodulator to provide time-code signals for a utilization device. The high pass filter is connected to a normal audio channel.
REFERENCES:
patent: 3017616 (1962-01-01), Runyan
patent: 3591731 (1971-07-01), Stancil
patent: 3681524 (1972-08-01), Nicholls
patent: 3717725 (1973-02-01), Numakura
patent: 3761611 (1973-09-01), Nakamura et al.
patent: 3830968 (1974-08-01), Redlich et al.
patent: 3875583 (1975-04-01), Poetsch et al.
patent: 3913135 (1975-10-01), Damalamian
"PCM Recorder, A New Type of Audio Magnetic Tape Recorder"; Sato; Journal of Audio Eng. Society, Sep. 1973, vol. 21, No. 7, pp. 542-548.
McGraw-Hill Encyclopedia of Science and Technology, vol. 1, .COPYRGT.1971, p. 388.
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