Hi Bill, I don't really see a problem.
You scale the range of values to the range of pixels as a rounded integer. That is, for a window 1000 pixels wide and data from 500 Hz to 4 Khz, the values get scaled to 0 to 1000 with integer rounding and plotted. Maybe there are people with the eyes of eagles out there that can see an artifice at the 1 pixel level, but I can't. The only was I can see where this would effect the accuracy of anything is the case where someone had a very narrow (in pixels) display and clicked on the waterfall, in which case they could be off frequency by a few Hertz, which is basically irrelevant as a signal can be off for tens of Hertz and still decode in the receive pane and any error will be corrected when the responding call is clicked. -------------------------------------------- On Sat, 3/28/15, Bill Somerville <g4...@classdesign.com> wrote: Subject: Re: [wsjt-devel] WSJT-X: Default waterfall bandwidth. To: wsjt-devel@lists.sourceforge.net Date: Saturday, March 28, 2015, 4:54 PM On 28/03/2015 22:48, Jim Pennino wrote: Hi Jim, > I too think the waterfall in it's current configuration is confusing and a bit unwieldly. > > What I would like to see is the bins/pixel control go away and be replaced by a Stop control. > > The frequency spread would then be controlled by the Start and Stop controls. > > Resizing the window should do that, and only that, i.e. resize the window. The bins/pixel > becomes an internal calculation. > > Doing that would make the window monitor independant and each user can set things > up that best match their combination of radio bandwidth and monitor width. > > The initial defaults should be about 500 Hz to 4 KHz with a width of about 1000 pixels, > which should display on any monitor, including laptops, from the last decade or so. That is a rather more complex proposal to implement and may well be undesirable. There are two choices, either maintain the integral relationship between horizontal pixels and data plotted on the waterfall or do a much more complex floating point plot mapping that may not actually result in a clean waterfall display. The former would have to make dragging the width of the waterfall a very clunky operation with large "steps" in size, the later would make the waterfall width independent of bandwidth at a considerable computing and accuracy penalty. > > > > Bill, this is where some of the confusion arises with those > new to the mode > (I'm still learning). I now use the WSJT-X waterfall after > Mikes help, now > that I realise its importance. > > The thing is that you mention the default bandwidth and then > a suitable > bins/pixel setting as two different things. When I adjusted > the bins/pixel > setting here I also increased the waterfall bandwidth. > > I was not aware that some of the waterfall settings did not > just alter the > display, but configured WSJT-X too. > 73 Bill G4WJS. ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
