Patents by Inventor Philip Charles Plunkett

Philip Charles Plunkett has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Center channel derivation for stereophonic cinema sound
    Patent number: 4024344
    Abstract: In a stereophonic reproduction system, especially for a cinema, a center channel signal is derived by combining left and right channel signals. In order to harden the center image, particularly in speech, the left and right channel signals are compared and, when they include significant amounts of correlated information, the relative gain of the center channel is enhanced by boosting the gain of that channel and/or cutting the gain of the left and right channels. The test for correlation of information is preferably restricted to speech frequencies and the enhancement of relative gain may be performed only at middle frequencies.
    Type: Grant
    Filed: November 12, 1975
    Date of Patent: May 17, 1977
    Assignee: Dolby Laboratories, Inc.
    Inventors: Ray Milton Dolby, Philip Charles Plunkett