Other

Leonard H Greenberg

Philip L Young

A method and apparatus for facilitating voice and data communication between audio communication devices while utilizing a communication path other than long distance telephone lines includes interface adapters which respond to predetermined identification codes to automatically establish the desired communication path.

Apparatus for telephone communication over plural channels

A standard video signal is modified such that the modified video can be displayed in a normal fashion on a standard monitor device, yet copies made of the modified video signal by videotape recorders will reproduce a video signal containing disturbances which cause a generally unviewable display on a standard television or other video monitor device. The video signal is converted from a standard frame rate to a predetermined, non-standard frame rate video signal utilizing a videotape recorder modified to record at a non-standard speed.

Method and apparatus for generating a video signal producing an

A standard video signal is modified such that the modified video can be displayed in a normal fashion on a standard monitor device, yet copies made of the modified video signal by videotape recorders will reproduce a video signal containing disturbances which cause a generally unviewable display on a standard television or other video monitor device. The video signal is converted from a standard frame rate to a predetermined, non-standard frame rate video signal utilizing a videotape recorder modified to record at a non-standard speed. A burst interfering signal also can be added. A method of permitting a normal picture to be displayed from the modified video signal includes adding delay devices to a VCR or video monitor to respond to the non-standard frame rate and filtering or replacing the burst interfering signal.

Method and apparatus for modifying a video signal to inhibit

A method and an apparatus which modifies a video signal such that a conventional video monitor reproduces a normal picture from the modified video signal, whereas a videotape recording of the modified video signal and subsequent playback thereof produces disturbances in the displayed picture. Predetermined portions of the video signal are identified and copy protection signals are added thereto. The signal mixing and delaying characteristics of a videotape recorder comb filter are exploited to modify, produce and relocate synchronization and burst interfering copy protection signals added to an original videotape recording.

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Glendale, CA, United States of America

Leonard H Greenberg