Speech Envelope Normalization, a Method to Improve SNR and Suppress Noise in Present and Future Radio Systems.

摘要

Speech envelope normalization (EN) is a compression process that transforms dynamic speech waveforms into constant envelope signals which are optimum for transmission and reception using analog radio equipment. The EN process reduces dynamic range requirements, maximizes speech SNR, increases intelligibility, and suppresses noise. The Report covers EN theory and properties, EN circuit implementations, experimental evaluations, and applications analysis. (Author)