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Which of the following LPC produces a buzzy twang in the synthesized speech?

(a) Multiple excited LPC

(b) Residual excited LPC

(c) LPC Vocoders

(d) Code excited LPC

The question was asked in an interview for internship.

This intriguing question comes from Linear Predictive Coders topic in chapter Speech Coding of Wireless/Mobile

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The correct option is (c) LPC Vocoders

The best I can explain: LPC vocoder requires that the transmitter extract pitch frequency information which is often very difficult. Moreover, the phase coherence between the harmonic components of the excitation pulse tends to produce a buzzy twang in the synthesized speech.

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