This problem happens randomly but is very annoying, specially if I program my PVR (MythTV) to automatically record a show - the show can get recorded with metallic sound, which makes it very hard to understand during playback.
This is not MythTV-specific since I have been able to reproduce the problem using other applications, like the Gnome sound recorder. It is unrelated to full-duplex operation since when recording a show MythTV doesn't open /dev/dsp for writing.
I really have no idea about how to troubleshoot this. I don't think the problem is hardware, but is driver-related instead.
its almost certainly a software problem in mythTV and gnome sound recorder. i've written code that does this several times - every time it takes me ages to figure out why, and then i can never remember when i do it the next time. its related to off-by-1 errors in processing incoming audio.
i also have the same problem with speakfreely with my cs46xx. it does not look like the metallic sound is triggered by any specific event (load, I/O,...). out of the sudden somethings goes wrong. i think i also experienced it with the kde sound recorder. but i have not updated the alsa driver for a while (still 0.9.5 or so). toggleing the ADC sounds like a good idea. i have not tried that yet but reloading the modules works too.
not necessarily, of course, just a point of view.
hmm, what makes something sound metallic anyway? echo?
bye, wilfried
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