Patent ID: 6839851

Claim:
A digital signal receiver apparatus comprising: a digital signal bus input/output circuit which connects to a digital signal bus and transmits or receives a digital signal to or from external digital signal transmitter apparatuses connected to said digital signal bus; a controller which generates an instruction to said external digital signal transmitter apparatuses and executes an instruction from said external digital signal transmitter apparatuses; packets processing circuit which converts said instruction from said controller, to transmission packets, and converts received packets from said external digital signal transmitter apparatuses to an instruction to said controller; and a bus control circuit which transmits said transmission packets to said digital signal bus and receives said received packets from said digital signal bus via said digital signal bus input/output circuit; wherein said controller requests an authentication at a predetermined timing by generating an instruction for authentication request and performs the authentication to said external digital signal transmitter apparatuses by exchanging said instruction with said transmission packets and received packets.