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Walter T. Hartwell
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St. Charles, IL, US
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Patents Grants
last 30 patents
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Patent Grant
Automatic speech recognition using echo cancellation
Patent number
4,914,692
Issue date
Apr 3, 1990
AT&T Bell Laboratories
Walter T. Hartwell
G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information
Patent Grant
Digital speech coder with different excitation types
Patent number
4,912,764
Issue date
Mar 27, 1990
American Telephone and Telegraph Company, AT&T Bell Laboratories
Walter T. Hartwell
G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information
Patent Grant
Digital speech vocoder
Patent number
4,797,926
Issue date
Jan 10, 1989
American Telephone and Telegraph Company, AT&T Bell Laboratories
Edward C. Bronson
G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information
Patent Grant
Digital speech sinusoidal vocoder with transmission of only subset...
Patent number
4,771,465
Issue date
Sep 13, 1988
American Telephone and Telegraph Company, AT&T Bell Laboratories
Edward C. Bronson
G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information
Patent Grant
Data storage and retrieval structure for a message storage system
Patent number
4,221,933
Issue date
Sep 9, 1980
Ronald G. Cornell
H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Patent Grant
Memory organization to distribute power dissipation and to allow si...
Patent number
4,164,041
Issue date
Aug 7, 1979
Bell Telephone Laboratories, Incorporated
Walter T. Hartwell
G06 - COMPUTING CALCULATING COUNTING