Computer Audio Asylum: RE: another interesting test by Tony Lauck Music servers and other computer based digital audio technologies.

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Posted by Tony Lauck (A ) on July 30, 2009 at 07:16:45

In Reply to: another interesting test posted by Werner on July 29, 2009 at 22:45:55:

"Did you use MP twice?"

No. Just once. As you said, it is only needed once. It can be either in the anti-alias case or in the anti-image case. Not only is this supported by theory, it is supported by the practical reality of the sampling rate converter that I used as seen in waveforms. (Izotope RX Advanced allows you to pick any mixture of minimum phase to linear phase. I just tried the limits for the tests.)

The need for MP filters in a playback system is an indication that the mastering engineer lacked the proper tools or used them improperly. The cultural artifact he produces is a set of numbers that represents a continuous analog waveform interpreted according to the sinc function, and this should have been explicitly specified in the Red Book standard if it wasn't. If a consumer uses playback that is intentionally different from the best available approximation to the sinc function then he is choosing to use a subtle "tone control". Nothing wrong with this, if it makes your recordings sound better, but if you are creating recordings, as I am, then it is necessary to have the least colored playback possible.

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