Re: fast universal compression scheme and its implementation in VHDL
- From: "megagurka" <megagurka@xxxxxxxxx>
- Date: 29 Aug 2005 04:35:12 -0700
Jens Mander skrev:
> - is there any free example code for compression algorithms available in
> VHDL to get an overview and a first impression of implementation complexity?
www.opencores.org
> - as the input data is unknown the álgorithm must be lossless, reducing
> redundancy (if possible), not irrelevancy. what are the theoretical limits
> of "universal" compression, not emphazizing one particular statistical
> property (like similar by values in succession)?
There is no universal compression. In some cases you will expand the
input data, so you need to be able to handle that.
> - what if my code gains different compression ratios for consecutive data
> portions? surely a FIFO can decouple input and output rate but eventually
> the FIFO will underflow?
Use a fixed size output buffer. When the buffer is full, flush it. Of
course, because you're compressing data losslessy, the output rate will
vary over time (and will not be the same as the input rate).
/JN
.
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