Usrp_wfm_rcv.py and audio underrun aUaUaU

GNU Radio
1

I am having a problem with audio underruns when running usrp_wfm_rcv.py
I constantly get audio underruns. I have tried the “-O plughw:0,0”
option
suggested on this or some other list to overcome this problem, but it
does
not help.
When I reduce usrp_decim from 200 to about 184 the underruns go away,
this I
guess indicates that the issue is not related to the USRP or the USB
interface as this will mean that more data is sent to the host.

The host is a powerful Pentium 2.4(running below 100% cpu load),
platform is
Fedora 10/GNURadio 3.1.3.

Could somebody please give me a hint on how to debug this issue further.

Thanks in advance
/Mikael

2

On Fri, Jan 9, 2009 at 12:59 AM, Mikael J.
[email protected] wrote:

I am having a problem with audio underruns when running usrp_wfm_rcv.py
I constantly get audio underruns.

Could somebody please give me a hint on how to debug this issue further.

Edit the file /etc/gnuradio/conf.d/gr-audio-alsa.conf, and change the
line

verbose=false
to
verbose=true

Re-run your application and post the screen output here.

-Johnathan

3

Jonathan
Thank you for the response.
Below is a print-out with the verbose flag set to true.

Regards
/Mikael

[mikael@gandalf usrp]$ ./usrp_wfm_rcv.py -f 97600000 -V 100 -O
“plughw:0,0”
adc_rate: 64000000
Using RX d’board A: Basic Rx
usrp_rate: 320000

gr_fir_ccf: using SSE
gr_fir_fff: using SSE
audio_rate: 32000, options: plughw:0,0
PCM name: plughw:0,0
Access types:
MMAP_INTERLEAVED YES
MMAP_NONINTERLEAVED YES
MMAP_COMPLEX YES
RW_INTERLEAVED YES
RW_NONINTERLEAVED YES
Formats:
S8 YES
U8 YES
S16_LE YES
S16_BE YES
U16_LE YES
U16_BE YES
S24_LE YES
S24_BE YES
U24_LE YES
U24_BE YES
S32_LE YES
S32_BE YES
U32_LE YES
U32_BE YES
FLOAT_LE YES
FLOAT_BE YES
FLOAT64_LE YES
FLOAT64_BE YES
MU_LAW YES
A_LAW YES
IMA_ADPCM YES
S24_3LE YES
S24_3BE YES
U24_3LE YES
U24_3BE YES
S20_3LE YES
S20_3BE YES
U20_3LE YES
U20_3BE YES
S18_3LE YES
S18_3BE YES
U18_3LE YES
U18_3BE YES
Number of channels
min channels: 1
max channels: 10000
1 channels YES
2 channels YES
3 channels YES
4 channels YES
5 channels YES
6 channels YES
7 channels YES
8 channels YES
9 channels YES
10 channels YES
11 channels YES
12 channels YES
13 channels YES
14 channels YES
15 channels YES
16 channels YES
Sample Rates:
min rate: 4000 (dir = 0)
max rate: -1 (dir = -1)
8000 YES
16000 YES
22050 YES
32000 YES
44100 YES
48000 YES
96000 YES
192000 YES
audio_alsa_sink[plughw:0,0]: using S32_LE

** (python:27664): WARNING **: IPP request failed with status 1030

** (python:27664): WARNING **: IPP request failed with status 1030
FYI: No Powermate or Contour Knob found
baseband_freq: 0, dxc_freq: 30400000.0, residual_freq:
-0.00596046447754,
inverted: 0)
baseband_freq: 0, dxc_freq: 30400000.0, residual_freq:
-0.00596046447754,
inverted: 0)
audio_alsa_sink[plughw:0,0]: sample resolution = 32 bits
aUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaU^C
[mikael@gandalf usrp]$

2009/1/9 Johnathan C. [email protected]

4

In my case CPU usage is below 100%. But I can try to disable OpenGL
anyway,
how can I do that?
Regards
/Mikael

2009/1/12 Johnathan C. [email protected]

5

On Sun, Jan 11, 2009 at 11:35 PM, Mikael J.
[email protected] wrote:

Below is a print-out with the verbose flag set to true.

It appears that your audio system is working correctly.

I’ve discovered I get something similar now on one of my test machines
that uses Ubuntu 8.10 and an the nvidia graphics driver. Apparently,
there is an odd interaction with OpenGL that raises CPU usage to 100%,
which goes away when I turn off GL support in GNU Radio. Sound
anything like what you’re seeing?

-Johnathan

6

Thanks
But it made no difference…
/Mikael

2009/1/12 Johnathan C. [email protected]

7

On Mon, Jan 12, 2009 at 11:19 AM, Mikael J.
[email protected] wrote:

In my case CPU usage is below 100%. But I can try to disable OpenGL anyway,
how can I do that?

In /etc/gnuradio/conf.d/gr-wxgui.conf, set the ‘style’ parameter to
‘nongl’.

-Johnathan

8

Any other ideas, suggestions?
Thanks
/Mikael

2009/1/13 Mikael J. [email protected]

9

Thanks for the response

I have the same problem with usrp_wfm_rcv_nogui.py…

Regards
Mikael

2009/1/13 Firas A. [email protected]

10

Hi,

Try :

usrp_wfm_rcv_nogui.py

if it is working with no aUaUaU, then you have CPU utilization problem.
If not, you have to check if your sound card can accept the required
32KHz audio stream.

Regards,

Firas