Dynamic magnetic information storage or retrieval – Record editing
Patent
1979-08-16
1983-06-14
Faber, Alan
Dynamic magnetic information storage or retrieval
Record editing
360 21, 360107, 360 99, 360 86, 360 97, 360 331, 358343, H04N 578, G11B 2102
Patent
active
043886558
ABSTRACT:
Apparatus in which a recording transducer is moved along a rotating record medium to develop a series of imprints which are phase-synchronized from track to track. The adjacent tracks are merged with the result that the imprints form a slanted pattern of generally continuous lines extending at an angle to the record tracks.
More than one recording can coexist in the same medium surface by means of utilizing a plurality of such slanted patterns, each of a different slant. For multiple recordings, either a plurality of transducers are used to record and playback, or a single transducer can be used by rotating it to the appropriate orientation.
Sound is recorded in the sync. intervals in the form of samples which form a staggered pattern of their own from track to track, so that only one sound sample may be read out at a time, even when the tracks have been heavily overlapped. Since the sound samples utilize a much smaller portion of the medium surface than the video, there is room in the sync. interval for more than one sound sample. A dither modulation is used to record and read out a higher sound fidelity or a stereophonic rendition or, in general, a multiplicity of sound channels accompanying the video.
Both a damping and also a stiffening method are used to make existing magnetic transducers extremely accurate in the location of the imprints during recording and reading, permitting the omission of clock transitions during recording, which is equivalent of a single side band process for maximum efficiency in medium utilization.
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