KODIERUNGSVERFAHREN FÜR FDM RUNDFUNKSENDUNGEN, SENDER UND EMPFÄNGER ZUR DURCHFÜHRUNG DES VERFAHRENS

摘要

A broadcast transmission using a frequency-division multiplex technique, such as the so-called DAB or DSB proposed radio system, uses a large number of carriers generated by coding digital information using a fast Fourier transform (12). Additional data is carried by relatively varying the amplitudes of the carriers in a modification circuit (26) by a slight amount in accordance with the additional data. The additional data may comprise transmitter identification. The additional data can be recovered by decision logic (46) in a receiver.