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:
> 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?

In theory, if you use hcidump and extract all the SCO data, you should
just have raw samples which you can stitch together into a file.

You should be able to see the two directions independently and see
where the noise is being introduced.

I don't know if there's a speific tool, but use hcidump -w to make a
raw log and then use hcidump -x -r to read the log back later. A little
bit of perl and a pass through sox should get the data into a playable
format.

	- Steven
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