The 'Slow' and 'SD Slow' filters have lower latency than their sharp counterparts but this comes at the cost of a high frequency roll-off and less attenuation of content above the Nyquist frequency, ie. If lower latency is desired, the 'SD Sharp' filter has very similar frequency response and similarly low imaging/aliasing but results in phase distortion which means that the delay is frequency dependant. the delay is constant for all frequencies. lowest imaging/aliasing, while also being phase linear, ie. The most accurate filter is 'Sharp' having the most linear frequency response up to 20 kHz and the highest attenuation of content above the Nyquist frequency, ie.
Audirvana dsd filter setting pro#
As RME is (for the most part) a pro audio company, this might be the reason 'SD Sharp' is selected as the default filter. Thus, if a steep filter and low overall delay (latency) is desired, the linearity of the phase response has to be compromised. However, the steeper the filter and the more linear its phase response, the greater overall delay (latency) it introduces. Thus, if the signal is properly band-limited there will be no ringing regardless of the selected filter and if the signal is not properly band-limited but there is no ringing there will be aliasing/imaging.
The same holds for filters that are not phase linear such as the 'SD' filters. Less steep filters on the other hand result in less ringing but regardless of whether there is out of band content contained in the signal result in more imaging/aliasing which of itself may be audible. It may however result in audible intermodulation distortion. However, even if the signal is not properly band-limited, the frequency of the ringing is half the sample rate which is at least 22.05 kHz and thus of itself is most likely not audible. The more the filter attenuates the out of band content, the more ringing there will be. as that seen in the single sample impulse responses. the signal is not properly band-limited, the filter has to remove (attenuate in practical terms) that content which results in the ringing eg. However, if there is out of band content in the sampled signal, ie. Obviously, this filter would need to be infinitely steep which is practically impossible. a signal that has no content above half the sample rate. Only this filter will correctly reconstruct a properly band-limited sampled signal, ie. a brick wall filter, while also maintaining a constant delay across all frequencies, ie. Theoretically, the correct filter is the one that has no attenuation up to half the sampling frequency and infinite attenuation above, ie.
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