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

[Marcus Müller]

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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