x_lk
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Quote:
I think the benefit of upsampling is more on the final anti-imaging filter stage. Virtually every CDP/DAC nowadays upsamples. AD1852 used by Zero is a Delta-Sigma modulation DAC. The DAC chip 8x upsamples a 44.1K signal before feeding it to Delta-Sigma Modulator, in order to avoid the need for a sharp analog low-pass filter. And this is where I got confused, since the DAC itself upsamples, then why external upsampling is ever needed? DAC-1 uses AD1853 and actually upsamples everything to 110K. They claim upsampling provides '20dB filter-performance improvement'. Is it because the SRC they use better than the AD1853 internal interpolator? I don't know, but would like to experiment and see if there is actually audible differences
Plus, I happen to have a DVD-Audio disc w/ 192K/24bit tracks.
BTW, I can't tell the differences between the original 44.1K and the upsampled 88.2K/96K on my system. Maybe my system is not good enough
Originally Posted by Currawong /img/forum/go_quote.gif More to the point, is there any benefit in feeding the Zero a 192k signal? The only benefit is a measuredly imperceptibly lower noise floor. |
I think the benefit of upsampling is more on the final anti-imaging filter stage. Virtually every CDP/DAC nowadays upsamples. AD1852 used by Zero is a Delta-Sigma modulation DAC. The DAC chip 8x upsamples a 44.1K signal before feeding it to Delta-Sigma Modulator, in order to avoid the need for a sharp analog low-pass filter. And this is where I got confused, since the DAC itself upsamples, then why external upsampling is ever needed? DAC-1 uses AD1853 and actually upsamples everything to 110K. They claim upsampling provides '20dB filter-performance improvement'. Is it because the SRC they use better than the AD1853 internal interpolator? I don't know, but would like to experiment and see if there is actually audible differences
BTW, I can't tell the differences between the original 44.1K and the upsampled 88.2K/96K on my system. Maybe my system is not good enough