System and method for transmitting digital data in the overscan portion of a video signal

Patent 5309235 Issued on May 3, 1994. Estimated Expiration Date:

September 25, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

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Inventor

Naimpally, Saiprasad V.

Assignee

Matsushita Electric Corporation of America

Application

No. 951101 filed on 09/25/1992

US Classes:

348/476, During sync, blanking, or overscan348/469FORMAT

Examiners

Primary: Groody, James J.
Assistant: Grant, Chris

Attorney, Agent or Firm

Ratner & Prestia

Foreign Patent References

2244888 GB 12/25/1991

International Classes

H04N 009/87
H04N 007/08

Abstract

A system and method for transmitting digital data in the horizontal overscan portion of a composite video signal is presented. A source supplies digital data which is encoded by a 32-state QAM encoder using a symbol clock having a frequency 4fsc, 4 times the color subcarrier frequency (fsc), then the encoded data is quadrature amplitude modulated using a carrier signal with a frequency of fsc /2. The modulated digital data replaces the video signal in the horizontal and vertical overscan portions of the baseband video signal. The video signal is received, the modulated digital data is extracted from the video signal, demodulated using QAM techniques, and decoded with a reconstructed version of the symbol clock.

Other References

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