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Which of the following is one of the most frequently used transform in speech coding?

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Which of the following is one of the most frequently used transform in speech coding?

(a) Fourier transform

(b) Wavelet transform

(c) Shearlet transform

(d) Discrete cosine transform

I had been asked this question in exam.

My enquiry is from Frequency Domain Coding of Speech topic in chapter Speech Coding of Wireless/Mobile

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The correct answer is (d) Discrete cosine transform

Explanation: DCT (discrete cosine transform) is one of the most attractive and frequently used transforms for speech coding. Fast algorithms developed for computing the DCT in a computationally efficient manner are used.

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