Generation of Excitation Signal in Voice Excited Linear Predictive Coding using Discrete Cosine Transform

Methods involved to generate the excitation parameters and gain have been proposed that provide improvement over plain linear predictive coding (LPC) in terms of better speech reconstruction. DCT computation to transmit the excitation signal energy in initial few coefficients gives a better reconstruction of innovation signal at the receiver as compared to the primitive method of pitch estimation. Gain computation in terms of the root mean square (RMS) value of the voltage levels for each frame reduces the complexity involved as compared to plain LPC, where gain was calculated in terms of mean square error.