Digital video signal processing with cut editing feature
First Claim
1. A method of processing a digital video signal, the method comprising the steps of;
- storing a segment of an input digital video signal in a random access memory;
repetitively writing said input digital signal in said memory at a standard speed, said writing proceeding cyclically from the start of said memory to the finish of said memory, then returning to the start of said memory;
reading said digital video signal from said memory at said standard speed, said reading normally lagging behind said writing by an amount substantially equal to the capacity of said memory;
effecting a cut edit of the read digital video signal by step reducing said amount by which said reading lags behind said writing; and
subsequent to said cut edit, reducing the reading speed below said standard speed until the amount by which said reading lags behind said writing is restored to said normal amount.
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Accused Products
Abstract
A method of and apparatus for processing a digital video signal to effect cut editing is disclosed. The method comprises storing a segment of an input digital video signal in a random access memory, the digital video signal being repetitively written in the memory at a standard speed, writing proceeding cyclically from the start of the memory to the finish of the memory, then returning to the start of the memory, and reading the digital video signal from the memory at the standard speed, the reading normally lagging behind writing by an amount substantially equal to the capacity of the memory, which may be several seconds. The read digital video signal is cut edited by step reducing the amount by which reading lags behind writing, and subsequent to a cut edit the reading speed is reduced below the standard speed until the amount by which reading lags behind writing is restored to the normal amount. The read digital video signal is supplied to interpolation filters to restore the frame frequency of the read digital video signal to the frame frequency corresponding to the standard speed.
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Citations
10 Claims
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1. A method of processing a digital video signal, the method comprising the steps of;
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storing a segment of an input digital video signal in a random access memory; repetitively writing said input digital signal in said memory at a standard speed, said writing proceeding cyclically from the start of said memory to the finish of said memory, then returning to the start of said memory; reading said digital video signal from said memory at said standard speed, said reading normally lagging behind said writing by an amount substantially equal to the capacity of said memory; effecting a cut edit of the read digital video signal by step reducing said amount by which said reading lags behind said writing; and subsequent to said cut edit, reducing the reading speed below said standard speed until the amount by which said reading lags behind said writing is restored to said normal amount. - View Dependent Claims (2, 3, 4, 5)
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6. A digital video signal processing apparatus comprising:
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a random access memory for storing a segment of an input digital video signal; means for repetitively writing said digital video into said memory at a standard speed, said writing proceeding cyclically from the start of said memory to the finish of said memory, then returning to the start of said memory; means for reading said digital video signal from said memory at said standard speed, said reading normally lagging behind said writing by an amount substantially equal to the capacity of said memory; means for effecting a cut edit of the read digital video signal by step reducing said amount by which said reading lags behind said writing; and means operative subsequent to said cut edit for reducing the reading speed below said standard speed until the amount by which said reading lags behind said writing is restored to said normal amount. - View Dependent Claims (7, 8, 9, 10)
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Specification
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- Resources
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Current AssigneeSony Corporation (Sony Group Corp.)
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Original AssigneeSony Corporation (Sony Group Corp.)
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InventorsLevy, David F.
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Primary Examiner(s)Faber, Alan
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Assistant Examiner(s)YOUNG, WAYNE R
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Application NumberUS07/154,229Time in Patent Office692 DaysField of Search358/311, 358/335, 358/337, 358/339, 358/21 R, 358/22, 358/160, 358/185, 358/908, 358/213.25, 360/14.1-14.3, 360/31, 360/32, 360/33.1, 360/36.1, 360/36.2, 360/39, 360/52, 360/9.1, 382/57, 364/200 MS File, 364/900 MS File, 365/189.01, 365/189.04, 365/233US Class Current386/278CPC Class CodesG11B 2220/20 Disc-shaped record carriersG11B 2220/61 wherein solid state memory ...G11B 2220/90 Tape-like record carriersG11B 27/024 on tapes G11B27/028, G11B27...G11B 27/026 on discs G11B27/028, G11B27...G11B 27/031 Electronic editing of digit...H04N 5/262 Studio circuits, e.g. for m...H04N 5/937 by assembling picture eleme...
