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US 5,845,042 AGranted
Transmission recording and reproduction of digital data and time information in transport packets using a compression ratio
AssigneeSony Corporation
InventorNaofumi Yanagihara
Life of this patent
Estimating the term…
Abstract
A data packet which contains time information is time compressed and the time information is extracted from the time compressed data packet. A system clock is synchronized with the extracted time information and is multiplied by a predetermined compression ratio to produce replacement time information which replaces the time information in the time compressed data packet. The time compressed data packet that now contains the replacement time information is modulated and transmitted or recorded.
Claims10
A digital data recording apparatus, comprising:
- means for receiving a data packet which was time compressed at a predetermined compression ratio, said data packet containing time information which replaced original time information originally present in said data packet prior to time compression thereof, said time information having been generated by multiplying a reference clock by said predetermined compression ratio;
- means for providing a portion of said data packet as variable-speed data;
- and
- recording means for recording said data packet and said variable-speed data in a normal and a trick-play area, respectively, on successive tracks on a record medium, said trick-play area being located on each of said tracks at a position corresponding to an area of a track which is reproducible in a fast-speed reproducing mode, said record medium being transportable in said fast-speed reproducing mode at a predetermined fast speed greater than a standard speed.
1 more element
A digital data recording method, comprising the steps of:
- receiving a data packet which was time compressed at a predetermined compression ratio, said data packet containing time information which replaced original time information originally present in said data packet prior to time compression thereof, said time information having been generated by multiplying a reference clock by said predetermined compression ratio;
- providing a portion of said data packet as variable-speed data;
- and
- recording said data packet and said variable-speed data in a normal and a trick-play area, respectively, on successive tracks on a record medium, said trick-play area being located on each of said tracks at a position corresponding to an area of a track which is reproducible in a fast-speed reproducing mode, said record medium being transportable in said fast-speed reproducing mode at a predetermined fast speed greater than a standard speed.
1 more element
Dependencies are inferred from the claim text.