Question

Which of the following is not a property that is utilized in coder design?

(a) Non zero autocorrelation between successive speech signals

(b) Non flat nature of speech signal

(c) Quasiperiodicity of voiced speech signals

(d) Uniform probability distribution of speech amplitude

I got this question in a national level competition.

My question is based upon Characteristics of Speech Signals in division Speech Coding of Wireless/Mobile

Answer 1

Correct option is (d) Uniform probability distribution of speech amplitude

Easy explanation: Speech waveforms have a number of useful properties that can be exploited when designing efficient coders. They are non uniform probability distribution of speech amplitude, non-zero autocorrelation between successive speech samples, the nonflat nature of the speech spectra and quasiperiodicity of voiced speech signals.