METHOD FOR ASSOCIATING AUXILIARY INFORMATION WITH RECORDED MAIN INFORMATION AND APPLICATION TO CONTROL OF RECORDED INFORMATION REPRODUCTION

摘要

METHOD AND DEVICE FOR ASSOCIATING AUXILIARY INFORMATION WITH PRINCIPAL INFORMATION, AND DEVICE FOR CONTROLLING THE REPRODUCTION OF PRINCIPAL INFORMATION RECORDED ON A TRACK. /P P ACCORDING TO THE METHOD, THE AUXILIARY INFORMATION IS ENCODED IN A AUXILIARY SIGNAL OF LIMITED FREQUENCIES AND SUPERIMPOSED ON THE MAIN SIGNAL TO BE RECORDED ON THE SAID TRACK. THE DEVICE INCLUDES A 11-BRANCH DETECTION CIRCUIT AT THE OUTPUT OF THE READING HEAD 10 FOR DETECTING AN AUXILIARY SIGNAL ASSOCIATED WITH THE MAIN INFORMATION AND OCCUPYING A LIMITED FREQUENCY RANGE AND A RECORDING DEVICE 25 FOR RECORDING THE AUXILIARY INFORMATION . / P P THE INVENTION APPLIES IN PARTICULAR TO THE CONTROL OF PUBLIC REPRODUCTION OF RECORDING.