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Which of the following are two types of speech coders?

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Which of the following are two types of speech coders?

(a) Waveform coders and source coders

(b) Active coders and passive coders

(c) Direst coders and indirect coders

(d) Time and frequency coders

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

My question comes from Characteristics of Speech Signals topic in portion Speech Coding of Wireless/Mobile

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The correct choice is (a) Waveform coders and source coders

The explanation: Speech coders can be categorised into waveform coders and source coders. Waveform coders can further be categorised into time domain and frequency domain. Source coders can be classified into linear predictive coders and vocoders.

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