An improvement of LPC based on noise reduction using pitch synchronous addition
Yohei Kuroiwa, Tetsuya Shimamura · 2003
In this paper, we propose a pitch synchronous addition method for LPC analysis by making use of the periodicity of speech. It is shown that the solution overcomes the difficulty involved with the technique of noise reduction compatible with the stability of the LPC filter obtained by subtracting the noise part from the autocorrelation function of speech. The relation between the pitch period of speech and the improvement in signal-to-noise ratio accomplished by the method is investigated. The simulation results show the effectiveness of the proposed method especially for high-pitched speech.