I have two speech signals of the same length. They contain the exact same speech content but are recorded from two different microphones. I want to compare the differences between them.
1) Assuming that the two signals are perfectly aligned, I can compute the spectrograms for both of them and calculate a distance/coherence metric (L2 distance or magnitude-squared coherence) between the two spectrograms. Are there any other ways of quantifying spectrogram differences?
2) If the signals are not perfectly aligned - even a misalignment of a few milliseconds - can mess up the L2 distance between spectrograms. What could be some strategies in this scenario?
Thanks for your inputs.