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Linear predictive coding system models the vocal tract as __________ linear filter.

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Linear predictive coding system models the vocal tract as __________ linear filter.

(a) Pole and zero

(b) All zero

(c) All pole

(d) No pole

The question was asked in homework.

This interesting question is from Linear Predictive Coders in chapter Speech Coding of Wireless/Mobile

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The correct option is (c) All pole

Easiest explanation: The linear predictive coding system models the vocal tract as an all pole linear filter. The excitation to this filter is either a pulse at the pitch frequency or random white noise depending on whether the speech segment is voiced or unvoiced.

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