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Spectral flatness measure is the ratio of ______ and _____

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Spectral flatness measure is the ratio of ______ and _____

(a) Variance, Geometric mean

(b) Geometric Mean, Variance

(c) Arithmetic mean, geometric mean

(d) Geometric mean, arithmetic mean

I had been asked this question by my school teacher while I was bunking the class.

My question is from Characteristics of Speech Signals topic in division Speech Coding of Wireless/Mobile

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Best answer
Right answer is (c) Arithmetic mean, geometric mean

Best explanation: Spectral flatness measure is defined as ratio of arithmetic to geometric mean of the samples of the PSD taken at uniform intervals in frequency. Spectral flatness measure is a qualitative measure of the theoretical maximum coding gain that can be obtained by exploiting the nonflat characteristics of speech spectra.

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