Lee Revell wrote: >>i've heard a lot of negative stuff about creative's native (?) 48000Hz >>sampling rate - not being too technically adept, i'm wondering what is >>really going on ... is *everything* put in through the ac97 codec >>(that's the input port, no?) sampled at that rate? what does this mean >>if i'm always setting jack (without the patched alsa) to record at >>44100Hz? i know that things start sounding funny if you record at 48000 >>and then playback/downsample to a different rate ..... >> >> >> > >The DSP runs at 48000 natively, and does hardware sample rate conversion >for all other rates. The exception is multichannel recording, which >only works at 16bit, 48000Hz, because you are directly capturing the >outputs of the internal DSP before it goes through any rate conversion. >Also, there is only one stereo sample rate converter for capture, while >for playback each of the 64 voices has its own SRC. > >These hardware SRCs are good quality, because emu10k1 is really a >hardware synthesizer that also can do PCM, the exact same hardware is >used for pitch shifting by the synth as sample rate conversion for PCM. >In practice there are some bugs but these can be worked around in the >driver. > > > >>should i *always* be using 48000Hz when recording on an emu10k1 card? if >>so, what's the best way to get a finished project down to CD-style >>44100Hz without making it sound wierd? >> >> >> > >The best way to use this card is to run at 48000HZ and then when you are >done resample to 44100 using a high quality software resampler. OTOH, >if you are working with a bunch of 44100Hz samples, you can run JACK at >44100Hz, if it sounds good to you. Multichannel playback at 44100 >should be supported eventually. Although, keep in mind the kX driver >doesn't support this yet, and they have docs from Creative. But you >won't get the multichannel recording functionality at this samplerate. > >If you are using it for live recording or effects processing then you >should certainly run at 48000. > >Lee > > > thankyou very much - very clear and informative! shayne
