The following issue requires your FEEDBACK. ====================================================================== <https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1151> ====================================================================== Reported By: felix Assigned To: jcdutton ====================================================================== Project: ALSA - driver Issue ID: 1151 Category: PCI - emu10k1 Reproducibility: always Severity: minor Priority: normal Status: feedback Distribution: Suse 9.1 Kernel Version: 2.6.5-7.147-default ====================================================================== Date Submitted: 06-02-2005 23:07 CEST Last Modified: 07-25-2006 00:46 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... ====================================================================== ---------------------------------------------------------------------- felix - 06-04-05 03:58 ---------------------------------------------------------------------- Two more exciting data, to see whether it is possible to isolate the problem to playback or recording: 1. synthesize and aplay a 1kHz tone at 8kHz sampling rate, simultaneously record at 12kHz sampling rate => Recorded tone is shifted up by ~ 1/8k 2. synthesize and aplay a 1kHz tone at 12kHz sampling rate, simultaneously record at 8kHz sampling rate => recorded tone is EXACTLY 1000Hz ---------------------------------------------------------------------- jcdutton - 07-25-06 00:46 ---------------------------------------------------------------------- Is this still a problem with the latest alsa driver? 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 06-03-05 00:29 sst4 Note Added: 0004879 06-03-05 10:59 perex Note Added: 0004883 06-03-05 17:44 felix Note Added: 0004884 06-03-05 17:45 felix Note Edited: 0004884 06-04-05 03:42 felix Note Added: 0004885 06-04-05 03:58 felix Note Added: 0004886 07-18-06 14:45 jcdutton Status new => assigned 07-18-06 14:45 jcdutton Assigned To => jcdutton 07-25-06 00:46 jcdutton Note Added: 0011217 07-25-06 00:46 jcdutton Status assigned => feedback ====================================================================== ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
