Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Synchronizing moving-head moving-record recorders
Patent
1981-10-05
1983-11-08
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Synchronizing moving-head moving-record recorders
360 75, G11B 2104, G11B 2102
Patent
active
044145861
ABSTRACT:
A pilot signal recording and reproducing system comprises a frequency generating circuit for successively generating a first frequency, a third frequency, a second frequency, and a fourth frequency in this order or in a reverse order for every recording unit of one track, where the first and second frequencies are mutually separated frequencies, selected from a first frequency group, and the third and fourth frequencies respectively are frequencies approximately equal to the first and second frequencies, selected from a second frequency group, a recording device for recording a frequency obtained from the frequency generating circuit as a pilot signal together with an information signal onto a recording medium, a comb filter for frequency-selecting pilot signals recorded on both sides of a track which is to be reproduced, where these pilot signals have mutually different frequencies and are included as crosstalk within a reproduced signal reproduced from the recording medium, a control circuit for controlling a delay time of a delay circuit within said comb filter and first and second filter circuits for respectively discriminating and separating pilot signals having mutually different frequencies obtained from the comb filter.
REFERENCES:
patent: 4143396 (1979-03-01), MacKenzie
patent: 4208671 (1980-06-01), Ozawa et al.
patent: 4315283 (1982-02-01), Kinjo et al.
patent: 4340907 (1982-07-01), Hirata et al.
Hiraguri Seisuke
Hirota Akira
Uchimi Takashi
Psitos Aristotelis M.
Victor Company of Japan Ltd.
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