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16/20/24-bit SPDIF input and output with up to 192kHz sample rate offers. I understand that not all CD's are properly mastered (anti-alias filtered). The ALC892 supports host audio from the Intel chipsets, and also from any other. My question is will there be a difference between a proper reconstruction filter (- a lot dB) at 22kHz and - the same lot dB at 24kHz ? My specific question is IF one has a properly produced 44.1 file, with proper filtering starting at 20kHz and down minus a lot at 22.05kHz and thus no signals present above 22.05kHz will there still be 'crap' above 24kHz on the output that could then IM with the audible frequencies below ? I expect there to be good and poorer ones. I know of very little recording (studio's) working on 44.1kHz so yes, during the mastering for CD there will always be an anti-alias filter in the down sample process. For telecom applications or higher sample rates, Fs/2 stopband is obviously ideal, but at 44.1Khz for audio applications there is no ideal solution, and I'd even go so far as to say that Fs/2 is more "wrong". The reason DAC designers from all of the major IC vendors have generally settled on filters with a 0.54Fs stopband isn't because they're incompetent - it's because they realize the inherent tradeoff in time-domain performance. You can't have your cake and eat it too because of the way the math works. (When you hear increased presence with the sharp filter, I'd argue what you're hearing is a psychoacoustic effect of the pre-ringing.)Ī lot of people on this forum (not you) don't seem to understand that you can't have good attenuation at Fs/2 on 44.1kHz sampled data while preserving 20kHz bandwidth without also having considerably more pre-ringing.
#REALTEK ALC892 AUDIO CODEC SAMPLE RATE DRIVER#
WaveRT-based audio function driver for Windows Vista. There is debate about how much pre-ringing is audible, but to the extent it may be audible, it's more likely to be audible than IMD at -125 dB down. The ALC892-CG/ALC892-DTS-CG is a high-performance multi-channel High Definition Audio Codec with Realtek proprietary lossless content protection technology that protects pre-recorded content while still allowing full-rate audio enjoyment from DVD audio, Blu-ray DVD, or HD DVD discs. You don't show the time domain measurements, but the steep filter necessarily has about double the amount of pre-ringing. Your results show that, at worst, the amount of IMD caused by aliases in the passband with the "slow" filters is more than about -125 dB down - i.e., definitely inaudible. I draw the opposite conclusions from your results here.