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
Received on Sun Jan 23 08:15:05 2005
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