On 21/08/2015, Ethan Duni <ethan.d...@gmail.com> wrote: >>In this graph, the signal frequency seems to be 250 Hz, so this graph >>shows the equivalent of about 22000/250 = 88x oversampling. > > That graph just shows the frequency responses of various interpolation > polynomials. It's not related to oversampling.
Creating a 22000 Hz signal from a 250 Hz signal by interpolation, is *exactly* upsampling - the sampling rate changes by a factor of 88x. It's not bandlimited interpolation (using a windowed sinc interpolator), hence there is a lot of aliasing above Nyquist. Irregardless, it's still oversampling - the resulting signal is sampled with a 88x higher frequency than the original. It's equivalent to creating a 3,880,800 Hz signal from a 44100 Hz signal. -P _______________________________________________ music-dsp mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mailman/listinfo/music-dsp
