Why are fsigs forced to float?  I cannot see why they should not be
MYFLTs.  This was the error in pvshift recently reported -- or at
least one problem.
==John ffitch

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I think it is to do with the disk format, which seems to enforce floats.
But Richard Dobson might have a more complete explanation.
Given that it was always floats, I just observed it.

Victor

On 16 Oct 2009, at 13:29, jpff wrote:

> Why are fsigs forced to float?  I cannot see why they should not be
> MYFLTs.  This was the error in pvshift recently reported -- or at
> least one problem.
> ==John ffitch
>
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No reason for fsigs themselves to be confined to floats (and indeed 
there are plenty of good reasons for using doubles, not least for the 
Sliding aspect, which will lose quality very quickly using floats); just 
the pvx file format itself is confined to floats.  I am open in 
principle to the idea of extending PVOCEX to doubles, but it will 
potentially make for huge files (bearing in mind PVOCEX supports 
multi-channel data), and it might be better in the longer term to move 
to a new format supporting 64bit chunks. Whether there is any practical 
justification for using doubles in such a file is another question. So 
long as my original comments in the pvocex-related code remain (i.e. the 
format is strictly floats, not MYFLTs), it should be fine to copy file 
data to/from doubles ad libitum.

And the Sliding pvoc system is conceived purely for real-time streaming 
(with sufficiently powerful hardware!); I gave no consideration at all 
to the notion of writing Sliding pvoc frames to a file; which would 
merely become even more large even more quickly!


Richard Dobson



Victor Lazzarini wrote:
> I think it is to do with the disk format, which seems to enforce floats.
> But Richard Dobson might have a more complete explanation.
> Given that it was always floats, I just observed it.
> 
> Victor
> 
> On 16 Oct 2009, at 13:29, jpff wrote:
> 
>> Why are fsigs forced to float?  I cannot see why they should not be
>> MYFLTs.  This was the error in pvshift recently reported -- or at
>> least one problem.
>> ==John ffitch
>>
>


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