On 05/28/2010 05:05 PM, Ralf Mardorf wrote: > Chris Cannam wrote: >> Why 1015 Hz? > > Slew rate of card x's input op-amps?
Slew-rates of op-amps are higher by at least an order of magnitude: off-the shelf cheap op-amps have ~ 10V/us. Fons' test signal may be ~50mV peak-to peak. In reply to Olivier message Fons already stated that it's not an issue with sampling. Besides there's usually a low-pass filter on each analog input. He probably choose 1015 Hz for aliasing: 48000/1015 or 44100/1015 is not a common ratio. ~1000 Hz is also in the middle of the card's spectrum and there's rarely sth. around your house that oscillates at frequency. There may be more to it, though. Fons? _______________________________________________ Linux-audio-dev mailing list Linux-audio-dev@lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev
