4 ms·
Even more importantly, there are many signals that sound identical to the human ear, yet are entirely different in waveform. (For instance, two sines shifted 90
by moultano 12y ago
Even more importantly, there are many signals that sound identical to the human ear, yet are entirely different in waveform. (For instance, two sines shifted 90 degrees.) You can save space by representing all similar sounding waveforms as the same waveform. This might make for a giant delta when you subtract it from the original recording, even though nothing audible was lost.
- schiffern 12y agoGood point! I believe the author in this particular case was subtracting in the frequency domain, not in the time domain — subtracting spectrographs instead of waveforms. In that case, a 90° phase-shifted sine wave would indeed cancel out.