Digital signal processing apparatus for recording and reproducing time-base compressed digital image data in an image transmission system
First Claim
1. A digital signal processing apparatus for recording and reproducing time-base compressed digital image data in an image transmission system, comprising:
- receiving means for receiving the digital image data;
first store means for storing said digital image data in a time-base compressed form;
first read means for reading the stored digital image data from said first store means and outputting the read digital image data in a time-base expanded form once said storing of said digital image data by said first store means is complete;
second store means for storing said digital image data in a time-base compressed form for a predetermined short period of time, beginning simultaneously with the storing operation of said first store means;
second read means for reading the stored digital image data from said second store means and outputting the read digital image data in a time-base expanded form during the storing period of said first store means; and
control means for matching a read out point of said first store means with a read point of said second store means after said completion of said storing operation of said first store means and for outputting said data read from said first store means in place of said data read from said second store means once said control means matches the respective read out points.
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Abstract
Time-based compressed data representing a program is supplied from a local conditional access circuit to two recording signal processing circuits which supply the data to be recorded simultaneously in time-compressed form by a digital VTR and an HDD (hard disc drive). The HDD need only store enough data to allow the digital VTR to record the entire program and to synchronize the output of the VTR with the output of the HDD. Once the program has been recorded on the VTR, it is reproduced therefrom concurrently with the portion of the program reproduced by the HDD and, once synchronization therebetween is reached, the VTR-reproduced data replaces the HDD-reproduced data. The reproduced data is supplied to an MPEG decoder circuit to be output as a reconstructed program for immediate display.
64 Citations
14 Claims
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1. A digital signal processing apparatus for recording and reproducing time-base compressed digital image data in an image transmission system, comprising:
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receiving means for receiving the digital image data; first store means for storing said digital image data in a time-base compressed form; first read means for reading the stored digital image data from said first store means and outputting the read digital image data in a time-base expanded form once said storing of said digital image data by said first store means is complete; second store means for storing said digital image data in a time-base compressed form for a predetermined short period of time, beginning simultaneously with the storing operation of said first store means; second read means for reading the stored digital image data from said second store means and outputting the read digital image data in a time-base expanded form during the storing period of said first store means; and control means for matching a read out point of said first store means with a read point of said second store means after said completion of said storing operation of said first store means and for outputting said data read from said first store means in place of said data read from said second store means once said control means matches the respective read out points. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A digital signal processing apparatus for recording and reproducing time-base compressed digital image data in an image transmission system, comprising:
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receiving means for receiving said digital image data; first store means for storing said digital image data in a time-base compressed form; first read means for reading the stored digital image data from said first store means and outputting the read digital image data in a time-base expanded form once said storing of said digital image data by said first store means is complete; second store means for storing said digital image data in a time-base compressed form for a predetermined short period of time, beginning simultaneously with the storing operation of said first store means; second read means for reading the stored digital image data from said second store means and outputting the read digital image data in a time-base expanded form after a predetermined portion of said digital image data has been stored by said second store means; and control means for matching a read out point of said first store means with a read point of said second store means after the completion of the storing operation of said first store means and for outputting said data read from said first store means in place of said data read from said second store means once said control means matches the respective read out points.
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9. A method for recording and reproducing time-base compressed digital image data in an image transmission system, comprising the steps of:
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receiving the digital image data; storing said digital image data in a time-base compressed form in a first storage means; reading the stored digital image data from said first storage means and outputting the read digital image data in a time-base expanded form once said storing of said digital image data in said first storage means is complete; storing said digital image data in a time-base compressed form for a predetermined short period of time in a second storage means, beginning simultaneously with the storing of said digital data in the first storage means; reading the stored digital image data from said second storage means and outputting the read digital image data in a time-base expanded form during the storing of said digital image data in the first storage means; and matching a point read from the first storage means with a point read from the second storage means after the completion of the storing in the first storage means and outputting said data read from the first storage means in place of said data read from the second storage means once the respective points are matched. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification