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Which of the non-linear transform is generally used to improve the coding of reflection coefficient?

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Which of the non-linear transform is generally used to improve the coding of reflection coefficient?

(a) Long area ratio transform

(b) Mutual information

(c) Least square

(d) Interpolation

I got this question in semester exam.

I'd like to ask this question from Linear Predictive Coders in section Speech Coding of Wireless/Mobile

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Correct answer is (a) Long area ratio transform

For explanation: Long area ratio (LAR) transform is generally used to improve the coding of reflection coefficient. This non linear transformation reduces the sensitivity of reflection coefficients to quantization errors. LAR performs an inverse hyperbolic tangent mapping of reflection coefficients.

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