Re: [Discuss-gnuradio] ALC662 audio card causes underruns and overruns

[Murray Thomson]

Thank you for your suggestions.

The card supports 96 KHz and I'm using hw. I'll try to use plughw.
I've solved this problem upgrading to the latest kernel in 12.04 which is 3.13.0-62.

Regards,

Murray

On 28 August 2015 at 13:52, Marcus Müller <address@hidden> wrote:

Also make sure that the ALC662 also supports the audio sampling rate
you're using -- 44100 is the only rate I've been able to use on any
platform [1].

Best regards,
Marcus

[1] http://gnuradio.org/redmine/projects/gnuradio/wiki/ALSAPulseAudio

On 28.08.2015 12:31, Jeff Long wrote:
> Make sure you're using 'plughw:' for the audio device so the driver
> does resampling (check ALSA docs). Without looking at the flowgraph,
> I'd guess this is a clock domain problem and your new computer (and
> audio card) clocks are somehow different than your old ones.
>
> On 08/28/2015 04:40 AM, Murray Thomson wrote:
>> Hi,
>>
>> I have a flow graph that receives, demodulates and filters a signal
>> before sending it to the audio card. It's been working in a single
>> board, single core, computer with an audio card ALC888 for months. I
>> occasionally had underrun messages, specially when changing filter
>> parameters. This messages were normally less than 10 and very spread,
>> about every 30 seconds. It didn't cause any noticeable noise or
>> problems.
>>
>> Recently I moved to a better computer with better CPU, 4 cores and a
>> ALC662 audio card. The Python script works fine, with no visible
>> bottlenecks in the processor. However, I now get constant overruns and
>> underruns reported, making the audio noisy.
>> The audio card is able to work correctly when using the speaker-test
>> command so, there isn't a fault in the hardware. It's also capable of
>> running at the required sample rate.
>>
>> Is there any test I could make to understand and fix this issue? Has
>> anyone had a bad experience using this audio card with GnuRadio?
>>
>> Thanks,
>> Murray
>>
>>
>>
>>
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