Improvements for the RPE-LTP Speech Codec

J. Valdés and A. Herrera (Mexico)


Speech Coding, Analysis by Synthesis, Most test, Speech Preprocessing, GSM, RPELTP.


The main purpose of this paper is to present some made modifications to standard RPE-LTP codec used in the actual GSM cellular telephony without modifying its structure and therefore without altering the bit rate. The original standard RPE-LTP and three modifications were simulated with a computer software and tested with a subjective quality measurement using the MOS (Mean Opinion Score) test. The modified techniques result in sound quality improvements when we compare them with the original standard.

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