A New Excitation Model for Linear-Prediction-Based Speech Codecs
Baoyu Zheng · Journal of Nanjing Institute of Posts and Telecommunications · 2001
We present in this paper a new binomial sine pulse (BSP) excitation signal used in linear-prediction-based speech codecs. The structure of the BSP excitation signal is actually a sine wave whose amplitude is modulated by a binomial signal. The binomial signal describes the various trends of excitation signals in a pitch period, and the pulsatance of the BSP excitation signal coincides with the vibration frequency of vocal folds. In experiments, processing is going on frame by frame and the same excitation signal is placed at every pitch excitation moment in a frame. Speech codecs based on this new BSP excitation have the advantages of low complexity and low delay. Experiment results prove that such a new speech codec can provide highly intelligible synthesized speech below 3 kbit/s.