Patent ID: 7116676

Claim:
A method to provide continuity of service in a radio broadcasting system, wherein the radio broadcast system includes at least one modem using a COFDM technique, and said radio broadcasting system is configured to transmit N time frequency cells modulated independently of one another, the method comprising: at transmission, sending a number N 1 of cells conveying signals for transmission of a digitized audio signal S 1 , and sending a number N 2 of cells conveying signals for transmission of an analog signal S 2 ; at reception, differentiating, in a received signal Sr, between at least the digitized audio signal S 1 and the analog signal S 2 ; replacing the digitized audio signal S 1 by the analog signal S 2 conveyed by the cells N 2 when the signals of the N 1 cells cannot be decoded, wherein a proportion of cells N 1 for a passband of about 10 kHz ranges from 50% to 80% of a quantity N of available cells.