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Richard H. Ketchum
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Wheaton, IL, US
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last 30 patents
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Patent Grant
Backward gain adaptation method in code excited linear prediction c...
Patent number
5,313,554
Issue date
May 17, 1994
AT&T Bell Laboratories
Richard H. Ketchum
G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information
Patent Grant
Code excited linear predictive vocoder using virtual searching
Patent number
4,910,781
Issue date
Mar 20, 1990
AT&T Bell Laboratories
Richard H. Ketchum
G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information
Patent Grant
Code excited linear predictive vocoder
Patent number
4,899,385
Issue date
Feb 6, 1990
American Telephone and Telegraph Company
Richard H. Ketchum
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