“…A field test was conducted to compare the speech quality of the digital radio to that of a conventional 5 kHz deviation FM mobile radio. [3] In this, we try to use some part of propose a speech-model based method using the linear predictive (LP) residual of the speech signal and the maximum-likelihood (ML) estimator proposed in "Blind estimation of reverberation time," (R. Ratnam, J. Acoust. Soc.…”