[hpsdr] DFC

[Phil Harman]

Hi Steve,

The transmit path will infact be the reverse of the receive i.e.

CPU/GPU/software > DAC > driver > PA > LPF.

Again no DSP done outside the PC.

I've modelled this in Matlab and it looks fine. Now just a few weeks away
from testing on actual hardware.

We will use the audio CODEC in the PC or on the SBC for audio in/out.

73 Phil...VK6PH


> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi,
>
> DFC in a nutshell:
>
> antenna > bandpass filter > pre-amp > ADC > CPU/GPU/software
>
> This speaks to the simplification of the RECEIVE portion of the problem.
> The xmit portion will remain similar to the current situation.
>
> There will be DACs etc. for xmit on the card.  There will be an FPGA on
> the card to run various functions.  But the FPGA will no longer do
> any of the FFT/DSP processing, greatly reducing its complexity.
> It probably wont have CODECs for speaker, the PC would provide
> those features via its soundcard. (will have some degree of support
> for mike/key on card, thats a question for Phil).
>
> FYI:  I am only involved in the CPU/GPU portion of the project, if I
> mis-spoke
> in any of my statements above, please correct me!
>
> Steve AD0ES
>
> On 05/12/2016 07:19 AM, Glen wrote:
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Oh, I must be confused.  It was my impression that DFC would
>> eliminate the need for the FPGA card.
>>
>> I 'assumed' the Cuda cores replace the FPGA processing, and the PC
>> was used for everything else.
>>
>> I also 'assumed' the daughter DFC card on the video card has the DDC
>> DUC hardware on it.
>>
>> I would guess it would not have CODECs on it for mic and speaker.
>>
>> Hence, the need for more info! ;-)
>>
>> 73
>>
>> Glen K4KV
>>
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