System and method of duplex wireless audio link over broadcast channels

Abstract

A device and method of duplex audio communication over a broadcast channel are disclosed. The device and method disclosed in the present invention use the clear channel technique to automatically select an un-occupied channel for the transmit side and utilizes an identification embedded in a sub-channel to allow the receiver to automatically tune to the channel used by the transmitter. The clear channels may be determined by respective transceivers or determined by a master transceiver.

1 . A method of coordinating tuning for a transceiver, the method comprising:
 determining a transmit radio channel in a radio band;   transmitting a transmit control message within the transmit radio channel using the transceiver;   searching for an ID in a receive control message over channels within the radio band to identify a receive radio channel using the transceiver; and   receiving first audio from a remote transceiver at the receive radio channel using the transceiver.   
     
     
         2 . The method of  claim 1 , wherein said determining the transmit radio channel is based on a clear channel scan method. 
     
     
         3 . The method of  claim 2 , wherein the clear channel scan method is started after a random delay. 
     
     
         4 . The method of  claim 1 , wherein the radio band is an FM broadcast band. 
     
     
         5 . The method of  claim 4 , wherein the transmit control message is transmitted in a transmit sub-channel associated with the transmit radio channel. 
     
     
         6 . The method of  claim 4 , further comprising transmitting second audio in the transmit radio channel using the transceiver. 
     
     
         7 . The method of  claim 4 , wherein the receive control message is transmitted in a receive sub-channel associated with the receive radio channel. 
     
     
         8 . The method of  claim 1  further comprising:
 evaluating channel quality of the receive radio channel using the transceiver; and 
 transmitting a new control message related to the quality of the receive radio channel using the transceiver. 
 
     
     
         9 . An apparatus of coordinating tuning for a transceiver, the apparatus comprising:
 means for determining a transmit radio channel in a radio band;   means for transmitting a transmit control message within the transmit radio channel using the transceiver;   means for searching for an ID in a receive control message over channels within the radio band to identify a receive radio channel using the transceiver; and   means for receiving first audio from a remote transceiver at the receive radio channel using the transceiver.   
     
     
         10 . The apparatus of  claim 9 , wherein said means for determining the transmit radio channel is based on a clear channel scan apparatus. 
     
     
         11 . The apparatus of  claim 10 , wherein the clear channel scan apparatus is started after a random delay. 
     
     
         12 . The apparatus of  claim 9 , wherein the radio band is an FM broadcast band. 
     
     
         13 . The apparatus of  claim 12 , wherein the transmit control message is transmitted in a transmit sub-channel associated with the transmit radio channel. 
     
     
         14 . The apparatus of  claim 12 , further comprising means for transmitting second audio in the transmit radio channel using the transceiver. 
     
     
         15 . The apparatus of  claim 12 , wherein the receive control message is transmitted in a receive sub-channel associated with the receive radio channel. 
     
     
         16 . The apparatus of  claim 9 , further comprising:
 means for evaluating channel quality of the receive radio channel using the transceiver; and   means for transmitting a new control message related to the quality of the receive radio channel using the transceiver.