Re: Week 44 looks interesting

David J Taylor GM8ARV 🏴󠁧󠁢󠁳󠁣󠁴󠁿 🇪🇺

Looking at the news for the week ahead - some more teasers for
David - I wonder if your thoughts about HRV have been listened to
So do I, James, but I have no inside information about this. I had
suggested either reducing the compression level or bit shifting the
whole data to be 10-bit data left justified in the 12-bit field
offered by the compressed JPEG channel. At present, the data is
right-justified which leads to an accuracy loss, according to my
tests. If the lossless Wavelet data occupies a similar bandwidth to
the lossy JPEG data, then by changing there is no ill effect. As
you know, the HRIT channel is already about 1.7Mb/s over DVB versus
1.0Mb/s over a direct link, so there is more flexibility than before.

Incidentally, does anyone understand the gain changes with
reference to the channel numbers - I didn't even know there was a
channel 13.4 !!
The 13.4um data is transmitted as channel number 11 - if you hold
your mouse over the thumbnail image the pop-up hint shows the
spectral range for the channel.


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