4 ms·
Taking the DTFT of a signal yields exactly the same amount of information, so it's not really more compact. Shazam used a spectrogram (which is more information
by duped 4y ago
Taking the DTFT of a signal yields exactly the same amount of information, so it's not really more compact. Shazam used a spectrogram (which is more information than the original signal) and searched for peaks to create a finger print.
It's not the analysis that is compact, but the fingerprint derived from it.
- WalterBright 4y agoI know it contains the same information, but it makes it easy to discard the low amplitude frequencies, and the frequencies that are not heard by the ears, or are not particularly important to our ears.
- LudwigNagasena 4y agoYou get a spectrogram by applying Fourier transform. Also, getting more information out of something than it contains is literally impossible.