Voiced/Unvoiced/Silence discrimination of speech by delta modulation

This paper presents a new method of voiced/unvoiced/ silence discrimination of speech. The decision algorithm is based on the results of counting bit alternations of the bit stream from linear delta modulation (LDM) of the speech signal and zero crossings of a band-pass filtered output of the decoded LDM signal. Computer simulation of the system with real speech has yielded accurate results. Economical realization of the discriminator hardware using standard integrated circuits is also considered.