Abstract: 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 the compressed envelope and are utilized to form templates representing the speech signal.
Type:
Grant
Filed:
November 9, 1984
Date of Patent:
September 12, 1989
Assignee:
Alcatel USA Corporation
Inventors:
Hoshang D. Mulla, Douglas Sutherland, Priyadarshan Jaktdar
Abstract: Solid fibers or capillaries are coated with a metal, alloy or dielectric capable of withstanding temperatures in excess of 300.degree. C. and preferably 500.degree. C. The coating is deposited by a heterogeneous nucleation thermochemical deposition process occurring on the surface of the fiber.
Abstract: A line access apparatus for in-band communication includes a line coupler that functions as a high voltage isolation device and has a resonant frequency out of the signal transmission band. A carrier signal of about the resonant frequency is modulated at an in-band frequency to convey information across the line coupler.
Type:
Grant
Filed:
November 19, 1985
Date of Patent:
June 7, 1988
Assignee:
Alcatel USA Corporation
Inventors:
David A. Zeller, Jr., Francisco A. Middleton, Franklin Hargrave
Abstract: A liquid crystal optical cross point switching device includes first and second liquid crystal optical switches each characterized as having optical fibers spaced apart by liquid crystal material over a length thereof along which the cores of the fibers are exposed.
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