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The type of frequency domain coding that divides the speech signal into sub bands is _____

(a) Waveform coding

(b) Vocoders

(c) Block transform coding

(d) Sub-band coding

I have been asked this question by my college professor while I was bunking the class.

My query is from Frequency Domain Coding of Speech topic in division Speech Coding of Wireless/Mobile

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Correct answer is (d) Sub-band coding

Easy explanation: Sub band coding (SBC) is a method where the speech signal is subdivided into several frequency bands and each band is digitally encoded separately. The audible frequency spectrum 20Hz-20 KHz is divided into frequency sub-bands using a bank of finite impulse response (FIR) filter and output of each filter is sampled and encoded.

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