Dynamic magnetic information storage or retrieval – General recording or reproducing – Signal switching
Patent
1996-04-26
1998-02-03
Tran, Thang V.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Signal switching
360 64, 360 61, 386 56, G11B 1512
Patent
active
057151083
ABSTRACT:
A video cassette recorder (VCR) is disclosed which is capable of displaying the video being erased during a recording operation. Thus, during a recording operation the user is able to monitor the video being erased, so as to stop recording if the VCR has reached a video the user wishes to preserve. The VCR is capable to display the video being erased during a recording operation by doubling the rotational speed of the head cylinder during a recording operation. Since the rotational speed is doubled, half of the time period is used for reading and half for recording. The VCR includes a decompressing circuit to restore the video read during the double speed rotation of the head cylinder, and also includes a compressor to compressed the externally supplied video so as to record that signal at double the normal rotational speed.
REFERENCES:
patent: 5012356 (1991-04-01), Kosaka
patent: 5233483 (1993-08-01), Uchiyama
patent: 5272572 (1993-12-01), Bradshaw et al.
patent: 5428486 (1995-06-01), Nagase
patent: 5457584 (1995-10-01), Satoh
Cullen Larry T.
Samsung Electronics Co,. Ltd.
Tran Thang V.
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