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Cepstrum vocoder uses __________

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Cepstrum vocoder uses __________

(a) Wavelet transform

(b) Inverse wavelet transform

(c) Cosine transform

(d) Inverse Fourier transform

The question was asked in unit test.

I'm obligated to ask this question of Vocoders in chapter Speech Coding of Wireless/Mobile

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Right choice is (d) Inverse Fourier transform

Explanation: Cepstrum vocoders use inverse Fourier transform. It separates the excitation and vocal tract spectrum by Fourier transforming spectrum to produce the cepstrum of the signal.

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