From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <436F6FEA.4030207@csr.com> From: Steven Singer MIME-Version: 1.0 To: bluez-users@lists.sourceforge.net Subject: Re: [Bluez-users] Periodic noise on microphone with bt_sco (BTA-6030 Dongle, Motorola H500 Headset) References: <436F1C3B.5020002@web.de> <436F4D85.4030404@csr.com> <436F5602.1040105@web.de> <436F5B5C.7070506@csr.com> <436F608D.4020407@web.de> In-Reply-To: <436F608D.4020407@web.de> Content-Type: text/plain; charset=us-ascii Sender: bluez-users-admin@lists.sourceforge.net Errors-To: bluez-users-admin@lists.sourceforge.net Reply-To: bluez-users@lists.sourceforge.net List-Unsubscribe: , List-Id: BlueZ users List-Post: List-Help: List-Subscribe: , List-Archive: Date: Mon, 07 Nov 2005 15:16:58 +0000 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 -- This message has been scanned for viruses by BlackSpider MailControl - www.blackspider.com ------------------------------------------------------- SF.Net email is sponsored by: Tame your development challenges with Apache's Geronimo App Server. Download it for free - -and be entered to win a 42" plasma tv or your very own Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php _______________________________________________ Bluez-users mailing list Bluez-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bluez-users