Abstract: The invention is directed to a method of and apparatus for initiating a duplex communication in response to a received simplex communication. In one embodiment of a method of converting a simplex communication to a duplex communication a simplex message is received; a duplex communication protocol is transmitted in response; and a duplex communication is initiated based on the response. In another embodiment of a method of converting a simplex communication to a duplex communication, a simplex message from a sender is received that includes the sender's simplex ID. A duplex communication protocol associated with the sender's simplex ID is sought, and a duplex communication based on the duplex communication protocol is initiated when the protocol is received.

Abstract: A method of processing audio information for broadcast to an audience can include changing first audio information from occurring in a first time interval to occurring in a second time interval to provide time-changed audio information. The time-changed audio information can be combined with second audio information that is responsive to the first audio information to provide broadcast audio information.