Re: [Bluez-users] Periodic noise on microphone with bt_sco (BTA-6030 Dongle, Motorola H500 Headset)

[Steven Singer <steven.singer@csr.com>]

Dirk Stockmann wrote:
> But when the headset is connected to my Mobile Phone there is no noise,
> so it is unlikely that it is related to the headset itself. 

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.

>                                                             And I always
> thought (maybe wrong?) that the processing inside of the PC is pure
> digital. So there should be no noise on a recorded file. Besides from
> that my PC has a very good audio system with no noise at all.

Hmmm, the signal from the dongle to the PC should be digital, as should
the signal from the PC to the audio card. All the processing inside the
dongle should be digital too. The only analogue stage should be from the
audio card to the speakers.

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.

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.

	- Steven
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