Patents by Inventor James Conrad Schopp

James Conrad Schopp 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).

  • Patent number: 3983316
    Abstract: In a video disc system for recovering prerecorded signals from a disc record by a signal pickup including a turntable, turntable drive means, and turntable speed adjusting means, a turntable speed control system is provided for maintaining the rotation of the turntable at a predetermined speed. Means responsive to the rotation of the turntable generate sample pulses having a frequency which is a function of the actual speed of rotation of the turntable. The sample pulse occur at a predetermined frequency when the turntable is rotating at the predetermined speed. Means are employed for generating a sawtooth-shaped reference wave having a frequency which is a multiple of the predetermined frequency. A sample-and-hold circuit is coupled to the sample pulse generating means and reference wave generating means for determining the magnitude of the reference wave during the occurrence of each of the sample pulses for developing a speed error correction signal.
    Type: Grant
    Filed: March 17, 1975
    Date of Patent: September 28, 1976
    Assignee: RCA Corporation
    Inventor: James Conrad Schopp