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

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

Oooh, this is just like Jeopardy.

I'll take Bluetooth for $500.

Dirk Stockmann wrote:
> ... 266Hz ...

At what rate are SCO packets transmitted in an HV3 link?

What do I win?

> I would be very grateful to get pointers what to do to get rid of that
> buzz. I am a experienced programmer with some low-level kernel
> knowledge, so I would also invest some time in debugging if I would knew
> for what I should look.

Based on the frequency, this looks (sounds?) like an electrical
problem. Many parts of the RF will have duty cycles of 266 Hz. Even
the current demand of the module will have a profile with this
frequency (it may pulse from a few milliamps up to 50 milliamps at
this rate, with sharp edges).

I expect you're getting pickup from the electronics on the module onto
the microphone cables,or, more likely, the audio card in the PC -
they're notoriously badly shielded, you can even hear when you drag a
window round the screen.

I don't know if this information helps.

	- Steven
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