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Speech signal can be categorised in _____ and ______

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in Wireless/Mobile by (138k points)
Speech signal can be categorised in _____ and ______

(a) Voiced, unvoiced

(b) Active, passive

(c) Direct, indirect

(d) Balanced, unbalanced

This question was posed to me in a job interview.

Question is taken from Vocoders in section Speech Coding of Wireless/Mobile

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Correct option is (a) Voiced, unvoiced

To explain: Speech signal is of two types, voiced and unvoiced. Voiced sound is a result of quasiperiodic vibrations of the vocal chord. Unvoiced signals are fricatives produced by turbulent air flow through a constriction.

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