#define analog digital #define digital analog and now read again ….
Best, Steffan > On 19.03.2020|KW12, at 12:31, Theo Verelst <theo...@telfort.nl> wrote: > > Maybe a side remark, interesting nevertheless: the filtering in digital > domain, as > compared with the analog good ol' electronics filters isn't the same in any > of the > important interpretations of sampled signals being put on any regular digital > to > analog converter, by and large regardless of the sampled data and it's known > properties > offered to the digital filter. > > So, reconstructing the digital simulation of an analog filter into a > electronic > signal through either a (theoretically , or near-) perfect reconstruction DAC > or an > ordinary DAC with any of the widely used limited-time interval over sampled > FIR or IIR > simplified "reconstruction" filters, isn't going to yield a perfect > equivalent of a > normal, phase shift based electronics (or mechanics based) filter. Maybe > unfortunately, > but it's only an approximation, and no theoretically pleasing sounding > mathematical > derivation of filter properties is going to change that. > > It is possible to construct digital signals, where givens are hard-known > about the signal > which given a certain DAC will 'reconstruct' or simply result in an output > signal which > approaches a certain engineered ideal to any degree of accuracy. In general > though, the > signal between samples can only be known through perfect reconstruction > filtering > (taking infinite time and resources), and DACs that are used in studio and > consumer > equipment should be thoroughly signal prepared by pre-conditioning the > digital signal > feeding it such that it's very limited reconstruction filtering is used such > that certain > output signal ideals are approximated to the required degree of accuracy. > > Including even a modest filter in that picture isn't easy! > > Theo V. > _______________________________________________ > dupswapdrop: music-dsp mailing list > music-dsp@music.columbia.edu > https://lists.columbia.edu/mailman/listinfo/music-dsp > _______________________________________________ dupswapdrop: music-dsp mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mailman/listinfo/music-dsp
