Also, since it is hard to address where the root cause is, maybe you =
could divide the test into several steps to find it. Dump the audio =
stream into a .pcm/.wav file, and then play the file to check where the =
noise comes from - during the transferring process or during the playing =
process.=20
Thanks,=20
Lea
-----Original Message-----
From: [email protected] =
[mailto:[email protected]] On Behalf Of Dirk =
Stockmann
Sent: 2005=C4=EA11=D4=C27=C8=D5 22:11
To: [email protected]
Subject: Re: [Bluez-users] Periodic noise on microphone with bt_sco =
(BTA-6030 Dongle, Motorola H500 Headset)
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Hi,
Steven Singer wrote:
> I agree with this diagnostic. If the headset doesn't generate noise
> when attached to another device then the noise is probably not being
> inserted at the headset end.
No noise with two different mobile phones, but with two different =
dongles.
> One way to confirm whether it's electrical is to record digital signal
> received from the dongle into a file, shut down the SCO link and then
> play the file to the PC's loudspeakers.
When I record "silence" from the microphone (as silent as possible) then
there is clearly the noise with about -40db power.
Is there a way to record the digital from the headset directly, before
it is processed in alsa? Similar to the way hcidump works, maybe?
> Are you sending a signal to the headset and, if so, are you hearing a
> buzz in the headset's speaker? I'm wondering if a buzz in that
> direction (coming from the sensitive microphone input on the PC) is
> being looped through the air (or through the plastic) from the
> headset's speaker to its microphone.
Sound sent to the headset from the PC (e.g. an audiobook) is without the
buzz. It is quite low quality (like on a phone) but clear.
Regards,
Dirk
- --
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