14 июля 2011, 01:32 от Bill Unruh :
>
>
>
> 14 июля 2011, 01:32 от Bill Unruh :
> > Hmm, both the static and the "hum" look very strange.
> > The static would look like dropouts except they do not go to 0, but almost
> > seem as though they are sampling some other waveform. The "hum" has hal
Hmm, both the static and the "hum" look very strange.
The static would look like dropouts except they do not go to 0, but almost
seem as though they are sampling some other waveform. The "hum" has half that
looks like a nice sine wave and half that looks like a decapitated sine wive
-- with a rust
The "static" is continuous additional noise, which I would describe as a
low hum with an additional bouncing crackle. But I've posted a 300
kilobyte .wav file that I recorded in a quiet room:
http://www.unc.edu/~bapike/alsa/hum.wav
and spectra here (using two different horizontal scales):
On Wed, 13 Jul 2011, Brian Pike wrote:
> Hi,
> I've got a Compaq Presario 12XL505 laptop with a VT82C686 sound chip.
> Playing sound works fine. However, when I record sound using an external
> microphone, there is static recorded along with the sound. The microphone
> and microphone jack seem to
Hi,
I've got a Compaq Presario 12XL505 laptop with a VT82C686 sound chip.
Playing sound works fine. However, when I record sound using an external
microphone, there is static recorded along with the sound. The microphone
and microphone jack seem to be working fine, since there is no static when
On Wed, Jul 13, 2011 at 10:07 AM, Nicolai Krakowiak
wrote:
> If I apply the trivial hacky workaround (attached), I can play sound
> out the device again. Here's the initialization output with the
> bControlSize hack applied.
Even though the root cause for your problem here is somewhere else, we
On Wed, Jul 13, 2011 at 10:07 AM, Nicolai Krakowiak
wrote:
> There seems to be an issue in continuing along in mixer.c. I
> sprinkled printfs as I'm bad at parsing the kernel trace. It looks
> like the following occurs:
>
> parse_audio_unit() with a subtype == UAC_FEATURE_UNIT
> parse_audio_feat
On Tue, Jul 12, 2011 at 5:22 PM, Daniel Mack wrote:
> On Tue, Jul 12, 2011 at 12:39 PM, Nicolai Krakowiak
> wrote:
>> On Mon, Jul 11, 2011 at 3:22 AM, Daniel Mack wrote:
>> I got as far as sound/usb/card.c:514 calling snd_usb_create_mixer().
>> It looks like it is hitting the default clause in c
