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US 7,680,193 B2Granted
Method for storing video signals with different read/write rates
AssigneeThomson Licensing
InventorReiner Noske
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Abstract
The invention provides a method for storing video signals at a first rate and reading the stored video signals at a second rate. According to an embodiment of the method, the video signals to be stored are compressed. The compressed video signals are stored in a memory at a first rate. The compressed video signals a read from the memory into a buffer at the first rate. The video signals stored in the buffer are read from the buffer at a second rate such that the video signals are decompressed.
Claims6
Method for storing video signals at a first rate and reading the stored video signals at a second rate;
- comprising the steps of:
- compressing video signals in a first buffer memory;
- storing the compressed video signals from said first buffer memory in a random access memory;
- operated synchronously during writing and reading;
- reading said compressed video signals from said random access memory into a second buffer memory at said first rate;
- reading said compressed video signals from said second buffer at said second rate such that said compressed video signals are decompressed,
- wherein the step of compressing video signals includes:
- dividing video signals to be stored each into a plural number N of parallel data streams each carrying said video signals, whereby said dividing comprises delaying said parallel data streams with respect to each other by one pixel period;
- and
- time-compressing said plural number of parallel data streams to form a respective plural number of parallel time-compressed data streams,
- whereby each of said time-compressed data streams is obtained by sampling every N-th pixel from the respective parallel data stream, said sampling being carried out simultaneously for said parallel data streams at said first rate;
- wherein the step of storing said compressed video signals from said first buffer memory in said random access memory includes:
- writing said time-compressed data streams to said random access memory during a write portion of a predetermined write-read cycle of said random access memory;
- whereby each of said time-compressed data streams takes up only a part of said predetermined write-read cycle;
- wherein the step of reading said compressed video signals from said random access memory into said second buffer memory at said first rate includes:
- reading out said time-compressed data streams from said random access memory in a read portion of said write-read cycle and feeding them to said second buffer memory;
- and wherein the step of reading said compressed video signals from said second buffer memory at said second rate includes:
- multiplexing said decompressed data streams.
15 more elements
Dependencies are inferred from the claim text.