Compressed audio format developed by Ericsson used by many 3G cell phones for voice recordings such as MMS messages incorporates the Algebraic Code Excited Linear Prediction (ACELP) algorithm, which is designed to efficiently compress human speech au

New algorithm for speech compression noise, a noise reduction of speech based vad method. This new algorithm derived vad technology and spectral subtraction, it firstly deal with the noise signal vad, then the masking threshold is based on perception