JohnSwenson wrote: > I have done extensive testing of different DAC chips and digital filters > and have come to the conclusion that one of the biggest problem with > almost all DAC chips these days is the digital filter. Every one of them > (including the ESS) use a complex digital filter rather than something > like a true SINC, attempting to get better numbers in the spec sheet > without spending the required silicon resourses normally required to get > those numbers with a simple filter. My testing has shown that these > complex filters are quite audible and one of the biggest detriments to > really good sound out there. Using a DAC chip without a digital filter > and implementing one in an FPGA using a straight forward basic filter > design sounds much better than using the filters in the chips > themselves. > > The chip I'm using (PCM5142) has programmable DSP system inside that > lets me turn off the builtin complex filter and use my own simple > filter. My experiance has shown that a simple filter with with not quite > as good "specs" sounds much better than a complex filter with better > specs. > > John S. As a matter of interest, John, which specs are you referring to? Do you mean the stopband rejection or something more subtle. I'm interested in the effects of filters in would be interested if you could share some more details. Also I would be interested in what approach you take to the the tradeoff between stopband attenuation and signal bandwidth with 44Khz material.
------------------------------------------------------------------------ adamdea's Profile: http://forums.slimdevices.com/member.php?userid=37603 View this thread: http://forums.slimdevices.com/showthread.php?t=97881 _______________________________________________ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/discuss
