Implementation of a robust 2400 b/s LPC algorithm for operation in noisy environments
Abstract
A detailed description of the implementation of a robust 2400 b/s 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 b/s 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.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- April 1987
- Bibcode:
- 1987STIN...8727072S
- Keywords:
-
- Algorithms;
- Background Noise;
- Speech Recognition;
- Telecommunication;
- Vocoders;
- Voice Communication;
- Bandwidth;
- Coding;
- Contrast;
- Narrowband;
- Performance Tests;
- Prototypes;
- Communications and Radar