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Sutherland; Douglas
Shelton, CT
No. of patents:

Patent Number Title Of Patent Date Issued
4866777 Apparatus for extracting features from a speech signal September 12, 1989
A polyphase digital filterbank extracts a spectral envelope composed of thirty-two bands, having uniform bandwidths, from a speech signal. The spectral envelope is then compressed into a predetermined number of bands having uniform bandwidths. Spectral energy features are extracted from
4588864 Small key telephone system May 13, 1986
An intercommunication system makes use of existing quad wiring to provide intercom communication between the subsets of the system, as well as communication with a standard central office, or an "outside line". Each subset is provided with a control sequencer for selectively connecting t

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