[hpsdr] Demo / Simulation Mode?

[Ken N9VV (Win-7/64)]

Gosh, I thought the FPGA was running the CORDIC algorithm to create the 
I/Q stream(s) and then using various decimation so the streams would fit 
into the Ethernet/USB communication channel (along with Command and 
Control signals).

I thought *all* the *DSP* was being done inside PowerSDR using the 
amazing Warren-DSP (WDSP) module assisted by various code to steer the 
demodulated signal to our ears.

I certainly could have misunderstood and need to be re-educated about 
the block diagram provided by Phil VK6PH and shown in this document:
http://www.n9vv.com/Hermes%20an%20Introduction%20October%202011.pdf
(page 9 and accompanying text).

thanks for your interesting comment,
73 de Ken N9VV

On 9/8/2014 2:53 PM, John Marvin wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Right, I understand that. I was trying to bound the problem, i.e. If he
> expects to be able to tune around with VFO A then the problem is a lot
> harder. Otherwise, you just have to emulate the HPSDR protocol, which
> isn't all that hard. I've done bits and pieces of it for various
> projects on Linux, and others have mentioned doing similar things (John
> Laur). Not enough to do exactly what is required here, but it's a lot
> easier than trying to do the DSP functions that are currently being done
> in the FPGA.
>
> John
> AC0ZG
>
> On 9/8/2014 8:45 AM, Ken N9VV (Win-7/64) wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Hi John,
>> the problem that I encountered may be the same as the original poster.
>> If you record an I/Q file and then play it back while your rig is
>> CONNECTED to your LAN, everything works perfectly well including tuning.
>>
>> *However* if you record an I/Q file and then try to play it back on a
>> stand-alone PC (Laptop) you can not even get the file to start. There
>> seems to be something in PowerSDR that requires a LAN connection to a
>> real rig - or you *cannot* play an I/Q file.
>>
>> Then the tuning methods you reference are all correct and
>> understandable. The frustration is that you can not even get PowerSDR
>> to start in order to play the file that you successfully recorded.
>>
>> dit dit
>> 73 de Ken N9VV
>>
>> On 9/8/2014 1:01 AM, John Marvin wrote:
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> What you want might be possible, with one major exception. Are you
>>> expecting to be able to change the VFO A frequency and hear different
>>> things? That would be more difficult because when you change VFO A,
>>> PowerSDR is relying on the hardware to change the center frequency,
>>> which won't do anything if you are just playing a file, no matter what
>>> method you use to do it. For that scenario to work you would need
>>> something outside of PowerSDR doing DSP for you.
>>>
>>> If you are OK with a demo mode where you change VFO A and the frequency
>>> changes but the band display doesn't move (and what you hear doesn't
>>> change), then that is somewhat easier. If you really want to dial around
>>> (or click around) and hear different things you could enable either
>>> click tuning or a subreceiver (MultiRX using VFO B). In those cases
>>> PowerSDR doesn't change the center frequency using the hardware and
>>> instead does its own DSP internally to extract the signal (from within
>>> the signal slice(s) chosen by VFO A). That kind of emulation would be a
>>> lot simpler to do, but that might not meet your needs.
>>>
>>> John
>>> AC0ZG
>>>
>>> On 9/7/2014 4:35 PM, VaibhaV Sharma wrote:
>>>> ***** High Performance Software Defined Radio Discussion List *****
>>>>
>>>> Sorry, but I am still confused here.
>>>>
>>>> I need a running instance of PowerSDR / OpenHPSDR with simulated data
>>>> so that I can demonstrate serial control commands to do the following -
>>>>
>>>> * Change VFO frequency
>>>> * Change filter bandwidth
>>>> * Start / Stop Radio
>>>> * Etc.
>>>>
>>>> How can I do this with a recorded I/Q file being played back?
>>>>
>>>> Here is what I have tried till now -
>>>> * Recorded my own wav file in PowerSDR recording UI
>>>> * Played it back but it switches the pan adapter and waterfall display
>>>> to as if it is transmitting (it does not transmit though)
>>>> * I can hear the recorded audio back but cannot scroll around the band
>>>> during playback
>>>>
>>>> I also downloaded some pre-recorded I/Q wav files from the web but
>>>> when I play them back, the waterfall and pan adapter display is all
>>>> weird. The entire visible spectrum is filled up with incoming
>>>> transmissions. I can hear the audio fine but the display does not look
>>>> right.
>>>>
>>>> Any suggestions?
>>>>
>>>> Thanks,
>>>>
>>>> —
>>>> VaibhaV Sharma
>>>> W7VAI
>>>>
>>>>
>>>
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