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Which of the following is not a property of pdf of speech signals?

(a) Non uniformity

(b) Very high probability of non-zero amplitudes

(c) Significant probability of very high amplitudes

(d) Increasing function of amplitudes between these extremes

I have been asked this question in an international level competition.

This intriguing question comes from Characteristics of Speech Signals in section Speech Coding of Wireless/Mobile

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Best answer
The correct answer is (d) Increasing function of amplitudes between these extremes

Best explanation: There is a non-uniform probability distribution of speech amplitude. The pdf of a speech signal is in general characterized by a very high probability of non-zero amplitudes, a significant probability of very high amplitudes, and a monotonically decreasing function of amplitudes between these extremes.

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