An Entropy Based Method for Local Time-Adaptation of the Spectrogram
نویسندگان
چکیده
We describe a method for local time-adaptation of the spectrogram of audio signals: it is based on the decomposition of a signal within a Gabor multi-frame of raised cosine windows through the STFT operator. The sparsity of the analyses in every single frame of the multiframe is evaluated through the Rényi entropies measures. We give an analytical expression for the entropy of the spectrogram of a sinusoidal signal using Hanning windows of different sizes, and describe the results obtained with other basic signals; we then provide an example of the performance of our algorithm with an instrumental sound.
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A Reduced Multiple Gabor Frame for Local Time Adaptation of the Spectrogram
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