Patents by Inventor William A. Buchan

William A. Buchan 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).

  • Method and circuit for detecting and compensating for drop-out and distortion of frequency modulated video signals
    Patent number: 3947873
    Abstract: A circuit for use in a magnetic video tape recorder/playback system capable of detecting not only amplitude loss due to tape defects or loss of head-tape contact, but also zero crossing loss due to an increase of sideband amplitude with respect to carrier amplitude in the playback signal. The circuit comprises a high speed voltage comparator coupled to a one-shot and OR gate arrangement to cause the insertion of a compensating video signal should the FM playback signal fail to have a zero crossing and pass through a threshold level within a predetermined time period.
    Type: Grant
    Filed: September 19, 1974
    Date of Patent: March 30, 1976
    Assignee: BASF Aktiengesellschaft
    Inventor: William A. Buchan