US 5,758,013 AGranted

Digital magnetic recording/reproducing apparatus and cassette digital magnetic recording/reproducing apparatus

AssigneeKabushiki Kaisha Toshiba

InventorsShigeo Kizu, Hidenari Ikeda, Masahiro Nakashika, Yasuyoshi Nishikawa, Toshinobu Murakami, Keisuke Ogi, Fumihiko Murakami

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Abstract

A digital magnetic recording/reproducing apparatus comprising a unit for recording high-definition information including video information and audio information, which is based on a first high-definition television scheme, on a recording medium in accordance with a second high-definition television scheme, the first high-definition television scheme having a first data format of a first amount of information smaller than a second amount of information of a second data format of the second high-definition television scheme, the recording unit including a circuit for allocating a recording area corresponding to a difference between the first amount of information and the second amount of information as a free recording area on which any information is selectively recorded, to match the first amount of information with the second amount of information.

Claims6

Dependent claims

A digital magnetic recording/reproducing apparatus for recording and reproducing digitally a high definition television (HDTV) signal in accordance with a first mode for recording and reproducing a 1125/60-scheme HDTV signal representing a HDTV signal of 1125 lines per frame and 60 fields per second and a second mode for recording and reproducing a 1250/50-scheme HDTV signal representing a HDTV signal of 1250 lines per frame and 50 fields per second, comprising:

a rotary drum on which 16 recording heads and 16 reproducing heads are mounted;
a rotary machine for rotating, in both the first mode and the second mode, the rotary drum at a rotation speed of 150 revolutions per second in a recording operation, to record video data on a magnetic tape while forming eight helical tracks thereon every half-revolution of the rotary drum, and rotating the rotary drum at a rotation speed of 150 revolutions per second in a reproducing operation, to reproduce the video data by reading the eight helical tracks on the magnetic tape every half-revolution of the rotary drum;
and
a recording head control unit for controlling the recording heads to form, in the recording operation according to the first mode, 40 helical tracks on the magnetic tape every 2.5 revolutions of the rotary drum and record video data of one field thereon, the recording head control unit controlling the recording heads to form, in the recording operation according to the second mode, 48 helical tracks on the magnetic tape every 3 revolutions of the rotary drum to record video data of one field thereon;
wherein the recording head control unit includes a controller for controlling the recording heads to record video data on the magnetic tape by dividing a video data signal into 8 channels in the recording operation according to each of the first mode and the second mode, recording error correction code blocks of video data within 5 tracks corresponding to one channel and one field in the recording operation according to the first mode, and recording correction code blocks of video data within 6 tracks corresponding to one channel and one field in the recording operation according to the second mode.

2 more elements

A method of recording and reproducing digitally a high definition television (HDTV) signal in accordance with a first mode for recording and reproducing a 1125/60 scheme HDTV signal representing a HDTV signal of 1125 lines per frame and 60 fields per second and a second mode for recording and reproducing a 1250/50-scheme HDTV signal representing a HDTV signal representing a HDTV signal of 1250 lines per frame and 50 fields per second, comprising the steps of:

in both the first mode and the second mode, rotating a rotary drum on which 16 recording heads are mounted at a rotation speed of 150 revolutions per second in a recording operation, to record video data on a magnetic tape while forming eight helical tracks thereon every half-revolution of the rotary drum, and rotating a rotary drum on which 16 reproducing heads are mounted at a rotation speed of 150 revolutions per second in a reproducing operation, to reproduce the video data by reading the eight helical tracks on the magnetic tape every half-revolution of the rotary drum;
in the recording operation according to the first mode, forming 40 helical tracks on the magnetic tape every 2.5 revolutions of the rotary drum to record video data of one field thereon;
in the recording operation according to the second mode, forming 48 helical tracks on the magnetic tape every 3 revolutions of the rotary drum to record video data of one field thereon;
in the recording operation according to the second mode, adding recording data to make an amount of information per 8 helical tracks in the second mode coincide with that per 8 helical tracks in the first mode;
and
recording video data on the magnetic tape by dividing a video data signal into 8 channels in the recording operation according to each of the first mode and the second mode, recording error correction code blocks of video data within 5 tracks corresponding to one channel and one field in the recording operation according to the first mode and recording error correction code blocks of video data within 6 tracks corresponding to one channel and one field in the recording operation according to the second mode.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/650,547Filed 20 May 1996 · continuation
Priority: 18 Mar 1994
Granted: 26 May 1998
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

G11B 15/087
By sensing features present on or derived from record carrier or container: by sensing recorded signals
G11B 27/032
Electronic editing of digitised analogue information signals, e.g. audio or video signals: on tapes
G11B 27/036
Electronic editing of digitised analogue information signals, e.g. audio or video signals: insert-editing
G11B 27/11
Indexing; Addressing; Timing or synchronising; Measuring tape travel: by using information not detectable on the record carrier