David A. Berkley

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New York, NY, US

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Patents Grantslast 30 patents

Information Patent Grant
Electret transducer with a selectively metalized backplate
- Patent number 4,429,189
- Issue date Jan 31, 1984
- Bell Telephone Laboratories, Incorporated
- David A. Berkley
- G01 - MEASURING TESTING
Information Patent Grant
Removing reverberative echo components in speech signals
- Patent number 4,166,924
- Issue date Sep 4, 1979
- Bell Telephone Laboratories, Incorporated
- David A. Berkley
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Speech processor using controlled center clipping
- Patent number RE28919
- Issue date Jul 27, 1976
- Bell Telephone Laboratories, Incorporated
- David Arthur Berkley
- 179 -