From SVN 3570 I have a first pass of 700D tx and rx running on the
bench (i) between two laptops and (ii) in loopback using the alsa
loopback device (see user guide in freedv-dev). Haven't tried a Windows
build yet.
On my machines (Lenovo X200 and X220) CPU load looks good, even with
lots of bit errors making the LDPC decoder work hard. About 20-30% for
FreeDV GUI at -3db SNR, plus the window manager (X or Wayland).
If you super keen, pls feel free to compile and test over the air.
Still several features to add, e.g. interleaver is hard coded at 1 modem
frame at the moment.
As well as the FreeDV 1600 bug, I also noticed PortAudio was losing
buffers occasionally, causing the demodulator to get upset. So I
changed PortAudio to "high latency" mode, which isn't very high for our
application (50ms versus 5ms).
I'm in the process of adding some debug GUI info on the GUI to track any
sound card buffer under/overflows in the field.
- David
On 02/05/18 18:48, Alan Beard wrote:
Hi,
I've just compiled Ver 3553 on my Fedora 23 x86_64 box and note
700D is a bit CPU hungry:
top
Tasks: 293 total, 2 running, 291 sleeping, 0 stopped, 0 zombie
%Cpu(s): 56.7 us, 13.7 sy, 0.0 ni, 29.6 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
KiB Mem : 7592440 total, 447312 free, 1924012 used, 5221116 buff/cache
KiB Swap: 8191996 total, 6582368 free, 1609628 used. 5066424 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
29082 alanb 20 0 1273480 62888 43176 R 176.5 0.8 7:10.66 freedv
Also when running I get a lot of Overrun messages:
RX nsam: 640 fifo_used: 1152 fifo_free: 8447
ALSA lib pcm.c:7963:(snd_pcm_recover) underrun occurred
RX nsam: 640 fifo_used: 1280 fifo_free: 8319
I've fiddled with Samplerate , 44100 then 48000 then 32000, not much
different.
My box is a Low Power motherboard, ASRock QC5000-ITX, the AMD Kabini
processor with graphics.
Soundcard: Behringer UCA202 USB
All I need is a signal on 14.177MHz
No 73 valve here, only a 6BK4.
Alan VK2ZIW
On Tue, 1 May 2018 15:38:32 +0930, David Rowe wrote
> Hi,
>
> I've just published a blog post on the first on-air tests with
> FreeDV 700D:
>
> http://www.rowetel.com/?p=6013
>
> Thanks,
>
> David
>
>
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