From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugtrack@alsa-project.org Subject: [ALSA - driver 0001151]: Audigy sampling rate seems off Date: Thu, 2 Jun 2005 23:07:56 +0200 Message-ID: <178630e19238fc6fc8800261ef7c3a10@bugtrack.alsa-project.org> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from bugtrack.alsa-project.org (gate.perex.cz [82.113.61.162]) by alsa.jcu.cz (ALSA's E-mail Delivery System) with ESMTP id 3C5F91CF for ; Thu, 2 Jun 2005 23:07:56 +0200 (MEST) Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org The following issue has been SUBMITTED. ====================================================================== ====================================================================== Reported By: felix Assigned To: ====================================================================== Project: ALSA - driver Issue ID: 1151 Category: PCI - emu10k1 Reproducibility: always Severity: minor Priority: normal Status: new Distribution: Suse 9.1 Kernel Version: 2.6.5-7.147-default ====================================================================== Date Submitted: 06-02-2005 23:07 CEST Last Modified: 06-02-2005 23:07 CEST ====================================================================== Summary: Audigy sampling rate seems off Description: I'm doing an experiment that involves generating a tone, sending it out the sound card and into a (passive) circuit, and recording from the circuit back into line in at the same time. When I play a sample: mono, 8kHz sample rate, containing a synthetic 1kHz sin signal, the recording I get is of a signal 1000.12Hz. If I send 100Hz, I get back 100.012Hz. I use 'snd' to do a 256K-point FFT across a 10 second sample just to be sure. I've also verified this using FFTW and correlation-based programs of my own. I've also verified that the reference 1kHz and 100Hz signals are exact. As a sanity check, I tried the same experiment on the built-in sound card on that same PC. The signals come back correct. Note the seeming coincidence that the frequency of the signal coming back is 1/8000 higher than the signal output. I've never seen anything like it. Not that I've been looking before... ====================================================================== Issue History Date Modified Username Field Change ====================================================================== 06-02-05 23:07 felix New Issue 06-02-05 23:07 felix Distribution => Suse 9.1 06-02-05 23:07 felix Kernel Version => 2.6.5-7.147-default ====================================================================== ------------------------------------------------------- This SF.Net email is sponsored by Yahoo. Introducing Yahoo! Search Developer Network - Create apps using Yahoo! Search APIs Find out how you can build Yahoo! directly into your own Applications - visit http://developer.yahoo.net/?fr=offad-ysdn-ostg-q22005