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The Loudness Spectrogram consisted of the following enhancements over the
classical STFT-based spectrogram:
- The STFT is computed at a variety of time-frequency resolutions
(MR-STFT)
- The MR-STFT is smoothed and non-uniformly resampled
in frequency to approximate an auditory filter bank
- The power output of the auditory filter bank is taken to be the
excitation pattern along the basilar membrane
- A compressive nonlinearity is applied to produce the
specific loudness, which we take as our loudness spectrogram
- The specific loudness can be optionally smoothed with respect
to time to form a short- or long-term loudness spectrogram
- Summing over frequency yields the corresponding loudness
functions versus time
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