Re: [Musicpd-dev-team] Best Sinc Interpolator

2009-06-03 Thread Grant
 Upsampling works, but only multiples of the native source - ie 44.1
 to 96 the computer is not powerful enough. however 44.1 to 88.2 or
 176.4 works also. Don't even try Secret Rabbit Code upsampling in
 Foobar, would stall right from the first second with the processor at
 100%!!

 http://www.computeraudiophile.com/content/24192-USB-20-beer-budget-EMU-0404-mini-review?page=1

 This was written about Windows of course, but it describes my same
 problem.  44.1-96 is too much for the CPU.  Are you sure this isn't
 normal?

 That *might* be true for MPD, too, but we don't know currently.  My
 point was: even if libsamplerate eats all your CPU, then switching
 between OSS and ALSA shouldn't make any difference.  I'm curious
 what's the real cause of this.

OK, I'll try to get that report together.

 Why are you resampling to 96 kHz anyway?

My DAC sounds much better with libsamplerate upsampling than sending
16/44.1 to it.  Upsampling to 88.1 is a lot easier on the CPU, but it
doesn't sound quite as good.

- Grant

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Re: [Musicpd-dev-team] Best Sinc Interpolator

2009-06-03 Thread Max Kellermann
On 2009/06/03 22:08, Stefan Monnier monn...@iro.umontreal.ca wrote:
 how 'bout upsampling to 48KHz?  It should sound significantly better
 than 44.1KHz.

No, every resampling process reduces the (theoretical) quality of the
file.  Now if a 44.1 file upsampled to 96 sounds better than native
44.1 playback, then that must be a hardware quirk.  Maybe the sound
chip has a fixed sample rate, and plugs a poor hardware resampler in
front of it.

Max

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Re: [Musicpd-dev-team] Best Sinc Interpolator

2009-06-03 Thread Stefan Monnier
 Maybe the sound chip has a fixed sample rate, and plugs a poor
 hardware resampler in front of it.

That's what I assumed, yes, otherwise his report makes no sense.


Stefan

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