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Which of the following LPC uses two sources at the receiver?

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Which of the following LPC uses two sources at the receiver?

(a) Multiple excited LPC

(b) Residual excited LPC

(c) LPC Vocoders

(d) Code excited LPC

I got this question by my school principal while I was bunking the class.

This key question is from Linear Predictive Coders in portion Speech Coding of Wireless/Mobile

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Correct answer is (c) LPC Vocoders

The best explanation: LPC vocoder uses two sources at the receiver, one of white noise and the other with a series of pulses at the current pitch rate. The selection of either of these excitation methods is based on voiced/unvoiced decision made at the transmitter.

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