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8000 bps Vocoder
Overview
SPIRIT 8000 bps vocoder implements a proprietary Improved Code-Excited
Linear Prediction (ICELP) algorithm, based on well-known CELP model and
strongly optimized, ensuring significant improvement of speech quality at low
computational complexity. It can be effectively used in all applications where
storage capacity and/or bandwidth are limited.
Features
High speech quality (MOS about 4.0)
8000 bps encoded bit stream rate
Frame size 20 ms
Algorithmic delay 30 ms
Bit stream format 160 bits
Automatic built-in Frame Synchronization and Comfort Noise Generation (CNG)
Direct interface with PCM 8 KHz sampled data
Very simple application interface
Code is reentrant, supports multithreading and dynamic memory allocation
