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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Tom – a question for you – are you sure it is necessary to convert the 24-bit I and Q to single precision floating point? When I read the Digital RF 2.0 documentation,
I find the following:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:ArialMT">Another design decision underlying Digital RF is the requirement to support storing RF data in<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:ArialMT">rf_data in a variety of data types. Data can be written as either complex or real (i.e.,<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:11.0pt;font-family:ArialMT">single-valued) numbers. Data formats can be any data format supported by the HDF5 standard,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:ArialMT">from bytes to 128 byte floating point numbers.</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Are you referring to a different version of Digital RF? -73- Bill, AB4EJ<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Tom McDermott <tom.n5eg@gmail.com>
<br>
<b>Sent:</b> Sunday, May 26, 2019 9:08 PM<br>
<b>To:</b> TAPR TangerineSDR Modular Software Defined Radio <tangerinesdr@lists.tapr.org><br>
<b>Cc:</b> Scotty Cowling <scotty@tonks.com>; Engelke, Bill <bill.engelke@ua.edu><br>
<b>Subject:</b> Re: [TangerineSDR] Functional Specification v 0.3<o:p></o:p></span></p>
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<p class="MsoNormal">Hi Bill - thanks for iterating the specification. Here are a few comments on 0.3:<o:p></o:p></p>
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<p class="MsoNormal">There are no paragraph numbers to reference, and the page numbers may change<o:p></o:p></p>
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<p class="MsoNormal">depending on how mark-up is selected by the reader, so I'll reference the Title of the paragraph.<o:p></o:p></p>
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<p class="MsoNormal">General Requirements - Assumptions and Dependencies:<o:p></o:p></p>
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<p class="MsoNormal">1. The HD may be able to be reduced to 2TB if the 20GE snapshot<br>
can be made while recording to the ring buffer. 2T SSD drives<br>
are coming down in price faster than 4T.<o:p></o:p></p>
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<p class="MsoNormal">Technical Notes<o:p></o:p></p>
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<p class="MsoNormal">I am skeptical that a SBC-based host can run HDF5 and keep up<br>
with the received data. My quad Core I7-3740 3.4 GHz can not <o:p></o:p></p>
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<p class="MsoNormal">keep up with 4 x 192k from one antenna (one fourth the DE<o:p></o:p></p>
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<p class="MsoNormal">requested throughput). It may be better to run HDF5 only on the<o:p></o:p></p>
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<p class="MsoNormal">snapshot that is uploaded to the Central Server. That way it<o:p></o:p></p>
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<p class="MsoNormal">doesn't have to run at real-time speed, it only needs to code a small<o:p></o:p></p>
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<p class="MsoNormal">subset of the data and can run at a much slower rate paced by how<o:p></o:p></p>
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<p class="MsoNormal">fast the upload link is.<o:p></o:p></p>
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<p class="MsoNormal">Data format. The DE will downconvert and decimate the received
<br>
samples. This will produce 24 bit I and 24 bit Q samples, probably 2's<br>
complement binary. These will need to be converted to single<br>
precision floating point I and floating point Q prior to HDF5 encoding.<o:p></o:p></p>
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<p class="MsoNormal"><br>
-- Tom, N5EG<o:p></o:p></p>
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<p class="MsoNormal">On Fri, May 24, 2019 at 12:40 PM Engelke, Bill via TangerineSDR <<a href="mailto:tangerinesdr@lists.tapr.org">tangerinesdr@lists.tapr.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Scotty - Please see attached, updated to include some of the things discussed at Dayton. Next I will work on the Functional Specifications for the Central Control & Database system.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">If anyone would like me to start posting to the TAPR github or somewhere, please just text credentials to my mobile number, below. I can assure everyone that I will not make a
mess of it, having done this before.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">W. D. Engelke (Bill), Asst. Research Engr.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Center for Advanced Public Safety<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Cyber Hall<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The University of Alabama<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Tuscaloosa, AL 35487<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Desk: (205) 348-7244<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Mobile: (205) 764-3099<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal">-- <br>
TangerineSDR mailing list<br>
<a href="mailto:TangerineSDR@lists.tapr.org" target="_blank">TangerineSDR@lists.tapr.org</a><br>
<a href="http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org" target="_blank">http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org</a><o:p></o:p></p>
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