Voice/Data Detector and Discriminator for Use in Transform Speech Coders
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Speech signals are often coded for digital transmission by means of a transform coder. Transform coders operate by translating input data from the time domain to the frequency domain where the new signal values are more efficiently transmitted. A Fourier transform or a cosine transform are two commonly employed transform techniques. In a system in which speech or voice-band data signals may be intermixed, serious degradation may occur to the data signals if passed through a typical voice port and transform coder optimized for the transmission of speech. To prevent degradation, the incoming signal to the coder is monitored and classified as speech or data.