Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Patent
1977-03-03
1978-10-24
Lucas, Jay P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
360 25, G11B 545
Patent
active
041225023
ABSTRACT:
This invention relates to a playback system for a magnetic tape recorder comprising an amplitude distortion corrector. It has an input versus output characteristic such that when the input level is less than the playback saturation level, which corresponds to the start of non-linear characteristics of the playback signal produced from a recorded signal at more than the recording saturation level due to a saturation of the magnetic tape, the output level is proportional to the input level. When the input level is more than the playback saturation level, the input verses output characteristics is complementary to the input versus output characteristic of the magnetic tape at corresponding signal levels. The playback system further comprises a high frequency emphasizer having an emphasizing circuit section having predetermined frequency characteristics disposed before the amplitude distortion corrector to emphasize predetermined frequencies in the playback signal so as to correct frequency dependent variations in the non-linear characteristics of the playback signal corresponding to a high level recorded signal which occurs due to saturation of the magnetic tape. The playback system further comprises a high frequency attenuator disposed after the amplitude distortion corrector and having frequency characteristic complementary to that of the high frequencies emphasizer so as to attenuate the frequency emphasized by the high frequency emphasizer.
REFERENCES:
patent: 2868890 (1959-01-01), Camras
patent: 3568174 (1971-03-01), Jacoby
patent: 3927420 (1975-12-01), Hayashi et al.
patent: 4038692 (1977-07-01), Umeda
Lucas Jay P.
Nakamichi Research Inc.
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