Helical scan tape recording and/or replay apparatus
First Claim
Patent Images
1. In a record and replay system of the type wherein digital video information is recorded with each field or frame disposed on a set of multiple tracks and with only a single track being intended for replay during scene search modes, the improvement comprising:
- a first memory buffer unit which directs the most significant bits and the least significant bits of pixels to separate tracks through record electronics during the record mode of operation and directs those pixel bits from the tracks of operation, said first memory buffer unit being controlled by a first memory controller and having clock and mode select signals applied thereto, said memory controller having said mode select signal applied thereto as well as clock and sync signals during the record mode of operation or sync and timing signals from said replay electronics during the normal replay mode of operation;
a second memory buffer unit which directs only the most significant bits of pixels from the tracks through scene search electronics during scene search replay modes of operation, said second memory buffer unit being controlled by a second memory controller and having sync and timing signals applied thereto from said scene search electronics; and
a multiplexer which directs pixel bits from either said first or second buffer memory units during normal replay or scene search replay respectively.
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Accused Products
Abstract
A tape has a format of the type wherein digital video information is recorded with each frame or field disposed on a set of multiple tracks and with at least one track being intended for replay during scene search modes of operation, only the most significant bits of pixels are recorded on the search tracks.
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Citations
1 Claim
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1. In a record and replay system of the type wherein digital video information is recorded with each field or frame disposed on a set of multiple tracks and with only a single track being intended for replay during scene search modes, the improvement comprising:
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a first memory buffer unit which directs the most significant bits and the least significant bits of pixels to separate tracks through record electronics during the record mode of operation and directs those pixel bits from the tracks of operation, said first memory buffer unit being controlled by a first memory controller and having clock and mode select signals applied thereto, said memory controller having said mode select signal applied thereto as well as clock and sync signals during the record mode of operation or sync and timing signals from said replay electronics during the normal replay mode of operation; a second memory buffer unit which directs only the most significant bits of pixels from the tracks through scene search electronics during scene search replay modes of operation, said second memory buffer unit being controlled by a second memory controller and having sync and timing signals applied thereto from said scene search electronics; and a multiplexer which directs pixel bits from either said first or second buffer memory units during normal replay or scene search replay respectively.
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Specification
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Current AssigneeRCA Corporation (General Electric Company)
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Original AssigneeRCA Corporation (General Electric Company)
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InventorsHedlund, Lee V., Herzog, Donald G.
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Primary Examiner(s)Faber, Alan
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Application NumberUS06/210,788Time in Patent Office972 DaysField of Search360/33, 360/32, 360/22, 360/23, 360/9, 360/72.2, 360/48, 360/33.1, 360/9.1, 360/10.1, 360/10.3, 358/127, 358/335, 358/78US Class Current386/343CPC Class CodesG11B 20/10527 Audio or video recording; D...G11B 2220/90 Tape-like record carriersG11B 27/322 used signal is digitally codedG11B 27/323 Time code signal, e.g. on a...G11B 5/0086 using cyclically driven hea...H04N 5/926 by pulse code modulation H0...
