Information about optimized mode (there about PCM, for DSD also used 20 kHz filtering) in optimized mode Īs audio quality I consider as minimal distortions of original stuff after conversion. But not for all playback hardware and software. Reasons of non-linear distortions may be in software or/and hardware.Įxtracting DSF from ISO in AuI’s optimized mode may improve signal/noise ratio. Same things are happen with DXD records, that have significant non-filtered ultrasound noise derived from DSD. I suppose, that you hear this shifted ultrasound noise. It «kill» some part of dynamic range of audible signal only.īut in real apparatus due non-linear distortions this non-filtered ultrasound noise shifted to audible range. In ideal apparatus ultrasound noise is inaudible. For this case noise level will lower.įor other demodulators that have higher cutting frequency - DSD’s own noise passed by to output. These demodulators must have lower cutting frequency. With some DSD demodulators it can give noise decreasing. If ISO to DSF is converted (via AuI ConverteR) in optimized mode (with audio processing - not bit perfect), AuI filter high frequencies above 20 kHz. Processing that may be applied in AuI (for non-bit-perfect mode): resampling/filtering, clickless, gain, normalizing level. DSD demodulator may be used in playback software or DAC. Modulator may be used in conversion software (if extracted DSD is processed). When we playback DSD, noise level depend on both DSD modulator and demodulator.
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