Patent ID: 7376778

Claim:
A digital audio bus circuit arranged to implement a duplex digital audio bus, said digital audio bus circuit comprising: a first bus conductor having first and second bus sections connected to a first pass circuit; a second bus conductor having first and second bus sections connected to a second pass circuit; the first bus section of the first bus conductor and the first bus section of the second bus conductor each being coupled to a communications processor for processing digital telephony calls and to an audio codec for processing digital audio signals to analogue audio signals, and the second bus section of the first bus conductor and the second bus section of the second bus conductor each being coupled to a wireless codec for wirelessly transmitting and receiving digital audio signals; wherein each of said first and second bus conductors is arranged in use to be switchable between a unitary mode in which digital audio signals on one of the first and second bus sections of the respective said bus conductor are coupled by the pass circuit onto the other of the first and second bus sections of the respective said bus conductor and a dual mode in which digital audio signals from one of the first and second bus sections of the respective said bus conductor are not coupled by the pass circuit onto the other of the first and second bus sections of the respective said bus conductor.