Fast and slow playback method and apparatus for data recorded on

Dynamic magnetic information storage or retrieval – Record editing

Patent

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Details

360 7306, 360 7716, H04N 578, G11B 2102

Patent

active

050478729

ABSTRACT:
The rotary headwheel device for scanning oblique tracks on an advancing magnetic tape is provided with normal playback heads which follow the recording heads and trace the path of the same oblique tracks and also with auxiliary playback heads which trace the path of the respective tracks which the normal playback heads trace but do so 6 and 1/2 revolutions in advance. In order to improve display of the content of recorded digital television signals in a slowed down or accelerated motion mode, the auxiliary playback heads are shifted axially to offset them by a half track width from their position useful for audio processing, whenever the magnetic tape playback speed is off-normal. At such times the outputs of the several normal playback heads are evaluated as to error rate and if any of these outputs exceeds a reference error rate, a switchover unit on the rotary scanning device switches the rotary transformers, which carry the playback outputs to processing channels, from the normal playback heads to the auxiliary playback heads. The error rates are then measured and evaluated for the auxiliary playback heads, and when one of them shows an error rate exceeding the reference error rate, the rotary transformers are switched back to the normal playback heads and so on. The mechanical shift of the relative offset between auxiliary playback heads and normal playback heads is made and maintained electromagnetically for the duraton of off-normal tape speed operation in playback.

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"The Digital Television Tape Recorder-Audio and Data Recording Aspects"-SMPTE Journal, Jan. 1986, by Kenneth P. Davies.
"Standard for Recording Digital Television Signals on Magnetic Tape in Cassettes" of the European Broadcasting Union (EBU), Tech. 3252--E.

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