Implementation of a Robust 2400 b/s LPC Algorithm for Operation in Noisy Environments
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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A detailed description of the implementation of a robust 2400 bs LPC algorithm is presented. The algorithm was developed to improve vocoder performance in acoustically compromised environments. Improved robustness in noise is achieved by 1 increasing the speech bandwidth to 5 kHz 2 increasing the LPC model order to 12 and 3 doubling the analysis rate. Frame fill techniques are used to achieve the 2400 bs data rate. The algorithm is embodied in the Advanced Linear Predictive Coding Microprocessor which was developed as a prototype voice processor for in-flight evaluation of narrowband voice communication in the JTIDS communication system. Keywords Robust vocoding Frame fill Linear predictive coding Speech compression.
- Voice Communications