SYSTEM FOR TRANSMITTING AUXILIARY INFORMATION IN LOW ENERGY DENSITY PORTION OF COLOR TV SPECTRUM
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Abstract
DESCRIBED IS A SYSTEM FOR COMPATIBLY TRANSMITTING AND RECEIVING BOTH A COLOR TV SIGNAL AND AN ADD-ON SIGNAL WITHIN THE FREQUENCY BAND NORMALLY OCCUPIED BY THE TV SIGNAL ALONE. THIS SYSTEM UTILIZES A HIGH FREQUENCY-TIME PRODUCT SIGNAL CONTAINING ADD-ON INFORMATION AND HAVING FREQUENCY COMPONENTS WHICH ARE LOCATED IN A LOW ENERGY PORTION OF THE TV SIGNAL. INTERFERENCE BETWEEN THE ADD-ON AND TV SIGNALS IS MINIMIZED DUE TO THE NOISE-LIKE CHARACTERISTICS OF THE HIGH FREQUENCYTIME PRODUCT ADD-ON SIGNAL AND TO THE PARTICULAR LOCATION OF
THE ADD-ON SIGNAL IN THE TV FREQUENCY BAND THUS ALLOWING ACCURATE AND RELIABLE TRANSMISSION OF BOTH THE ADD-ON AND TV SIGNALS.
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