Gandhi wrote: > That's interesting, John. I don't think that I've ever heard a DAC > without a reconstruction filter. Is there a mechanism somewhere for > dealing with the ultrasonic noise, which otherwise usually is removed > with an LP filter? > > Do you have any idea how much processing power that will be needed for > the upsampling? I'm trying to make an informed guess whether the WB Quad > will be up for both upsampling and the use of BruteFIR/BrutefirDRC. > There's got to be other convolution engines of course, but I'm not up to > speed on which ones that are optimised for ARM, has a working LMS plugin > and preferably is free of charge. (And I like BrutefirDRC for the > loudness functionality.)
The filtering is done in the upsampling, so it is not needed in the DAC chip, that way you bypass the not so great sounding filter built in to the chip. There is a simple analog RC filter at the output of the DAC to handle the really high frequency stuff generated by the 352.6/384 sample rate. John S. ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=99395 _______________________________________________ unix mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/unix
