Dynamic magnetic information storage or retrieval – Head – Core
Patent
1974-04-29
1977-05-10
Konick, Bernard
Dynamic magnetic information storage or retrieval
Head
Core
360 23, 1791003V, 179 1SM, 360 18, 360 32, 1791004ST, 1791001TD, G11B 700, G11B 2730
Patent
active
040229866
ABSTRACT:
A system comprising a playback unit and an associated long-playing record on which sound information is recorded in a time division multiplex code on several tracks. Upon reproduction the same track is scanned n times with the aid of a beam of light before this beam of light is directed to the next track. With the aid of a sampling gate the pulses comprising the sound information in time division multiplex code and associated with a first sound channel are sampled with the aid of said sampling gate while during a second revolution pulses from a second sound channel etc. are sampled.
In order to operate this sampling gate in synchronism with the scanning of said pulses the playback unit comprises first synchronizing means responding to pulses also comprising the sound information. Furthermore, at the commencement of each track, starting pulses are provided to which second synchronizing means respond. The output signals thereof control the first synchronizing means and a pivoting mirror reflecting the beam of light which after the record has made n revolutions with one and the same track being scanned is pivoted so that the beam of light is directed to the next track to be scanned. In another embodiment the pulses comprising the sound information are distributed in m groups of pulses 1 to n over a track and each group is preceded by a group pulse to which third synchronizing means respond. The output signals of these third synchronizing means control the first synchronizing means.
REFERENCES:
patent: 3601536 (1971-08-01), Calfee
patent: 3701846 (1972-10-01), Zenzefilis
patent: 3743793 (1973-07-01), Emerson
patent: 3745264 (1973-07-01), Emerson
patent: 3748381 (1973-07-01), Strobele
patent: 3769468 (1973-10-01), Shutterly
DE Bot Laurentius Antonius Peter Maria
Janssen Peter Johannes Michiel
Teer Kees
Cohen Simon L.
Faber Alan
Konick Bernard
Trifari Frank R.
U.S. Philips Corporation
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