초록

Mobile radio receivers in a broadcasting system having more than one transmission channel sending the same programs use time diversity to prevent service outages during periods when none of the channels can be received.

대표청구항 ▼

A method for substantially eliminating service outages from various causes, including physical blockage, multipath fading and electronic interference, by the transmission of at least two radio broadcast signals having frequencies in the range of about 300 MHZ to about 3,000 MHZ, and having substanti

A method for substantially eliminating service outages from various causes, including physical blockage, multipath fading and electronic interference, by the transmission of at least two radio broadcast signals having frequencies in the range of about 300 MHZ to about 3,000 MHZ, and having substantially the same content to a plurality of mobile receivers for said signals comprising: broadcasting a first radio broadcast signal to said plurality of mobile receivers; after a time delay of sufficient length to substantially eliminate said service outages, said delay being at least about 0.5 seconds, following the broadcast of said first radio broadcast signal, broadcasting a second radio broadcast signal containing substantially the same program content as said first radio broadcast signal to said plurality of mobile receivers; storing, in each of said mobile receivers, said first radio broadcast signal for a time period substantially the same as the time of said time delay; and outputting from each of said plurality of mobile receivers, the program contents of said first and said second radio broadcast signals by combining said first and said second radio broadcast signals for output or by selecting for output, in correct time-ordered progression, portions of said first radio broadcast signal and portions of said second radio broadcast signal.