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Non-linear scales are quite common in biological phenomena, and sensory perception often expresses logarithmic or power-law relationships between perceived intensity (P) and stimulus intensity (S). The Weber-Fechner law hypothesizes that the minimum stimulus intensity variation ($\Delta S$) necessary to produce a noticeable variation in perception is ...

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The idea behind nonuniform quantization (for example an a, or mu law for telephony speech) is to make better use of the input signal amplitude distribution in lossy source coding applications.. Over a period of time, it's emprically observed that, most of the speech occurs at low amplitude levels, and occasionally at high amplitude (full dynamic range) ...

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A spectrogram is a tool to analyze non-stationnary signals, and hopefully identify or separate it onto simpler sources. Hence, parts of the spectrograms ought to be "different". Hence, from a statistical point of view, the 2D data is likely to be multimodal, and global statistical measures are likely to be useless. If you now focus on specific &...

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