Digital signal processing apparatus

Abstract

If content is transmitted/received through a digital signal bus, protection of copyright causes a problem because of no deterioration in quality. Accordingly, authentication is required. The quantity of information to be processed is, however, so large that a long time is required for authentication. Accordingly, both achievement of handling property as in conventional analog connection and protection of copyrighted content without user's awareness become an object. The foregoing object can be achieved by authentication which is executed, for management of copyright, among apparatuses connected to the digital signal bus when the apparatuses are powered on or connected to the digital signal bus or when an input terminal connected to the digital signal bus is selected. The object can be further achieved by an encryption key shared among these apparatuses.

1 . 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 an external digital signal transmitter apparatus connected to said digital signal bus;   a controller which generates an instruction to said external digital signal transmitter apparatus and executes an instruction from said external digital signal transmitter apparatus;   packets processing circuit which converts said instruction from said controller, to transmission packets, and converts received packets from said external digital signal transmitter apparatus 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 apparatus by exchanging said instruction with said transmission packets and received packets.   
     
     
         2 . A digital signal receiver apparatus according to  claim 1 , wherein said controller requests authentication when said digital signal receiver apparatus is turned on, and then performs the authentication to said external digital signal transmitter apparatus. 
     
     
         3 . A digital signal receiver apparatus according to  claim 1 , wherein said controller requests authentication when said external digital signal transmitter apparatus is turned on, and then performs the authentication to said external digital signal transmitter apparatus. 
     
     
         4 . A digital signal receiver apparatus according to  claim 1 , wherein said controller requests authentication when said digital signal receiver apparatus is connected to said digital signal bus, and then performs the authentication to said external digital signal transmitter apparatus. 
     
     
         5 . A digital signal receiver apparatus according to  claim 1 , wherein said controller requests authentication when said external digital signal transmitter apparatus is connected to said digital signal bus, and then performs the authentication to said external digital signal transmitter apparatus. 
     
     
         6 . A digital signal receiver apparatus according to  claim 1 , further comprising:
 at least one input terminal including an input terminal from said digital signal bus; and   a switching circuit for selecting said input terminal,   wherein said controller requests authentication when said input terminal connected to said digital signal bus is selected by said switching circuit, and then performs the authentication to said external digital signal transmitter apparatus.   
     
     
         7 . A digital signal receiver apparatus according to  claim 1 , wherein said controller searches an external digital signal transmitter apparatus connected to said digital signal bus, requests authentication when said controller finds an external digital signal transmitter apparatus, and then performs the authentication to found external digital signal transmitter apparatus. 
     
     
         8 . A digital signal receiver apparatus according to  claim 1 , wherein said controller requests authentication when said controller finds an external digital signal transmitter apparatus which is transmitting a digital video signal and/or a digital audio signal, and then performs the authentication to said external digital signal transmitter apparatus. 
     
     
         9 . A digital signal receiver apparatus according to  claim 1 , wherein said controller requests authentication when said controller finds an external digital signal transmitter apparatus which is transmitting a digital video signal and/or a digital audio signal that cannot be copied freely, and then performs the authentication to said external digital signal transmitter apparatus. 
     
     
         10 . A digital signal receiver apparatus according to  claim 1 , wherein said controller requests authentication when said controller finds an external digital signal transmitter apparatus which was previously registered, and then performs the authentication to said external digital signal transmitter apparatus. 
     
     
         11 . A digital signal receiver apparatus according to  claim 1 , wherein said controller requests authentication when said controller finds an external digital signal transmitter apparatus which said digital signal receiver apparatus received a digital video signal and/or a digital audio signal from in the past, and then performs the authentication to said external digital signal transmitter apparatus. 
     
     
         12 . A digital signal processing method using a digital signal receiver apparatus, comprising the steps of:
 when said digital signal receiver apparatus is turned on,   converting an instruction from a controller to transmission packets and converting received packets to an instruction to said controller in a packets processing circuit;   transmitting said transmission packets from the packets processing circuit to said digital signal bus and receiving said received packets from said digital signal bus to said packets processing circuit via a digital signal bus input/output circuit by a bus control circuit;   requesting authentication by said transmission packets from said digital signal receiver, to said external digital signal transmitter apparatus connected to the digital signal receiver apparatus; and   performing the authentication to said external signal transmitter apparatus by said transmission packets and received packets.   
     
     
         13 . A digital signal processing method using a digital signal receiver apparatus, comprising the steps of:
 when said digital signal receiver apparatus is connected to an external signal transmitter apparatus;   converting an instruction from a controller, to transmission packets and converting received packets to an instruction to said controller in a packets processing circuit;   transmitting said transmission packets from the packets processing circuit to said digital signal bus and receiving said received packets from said digital signal bus to said packets processing circuit via a digital signal bus input/output circuit by a bus control circuit;   requesting authentication by said transmission packets from said digital signal receiver to said external digital signal transmitter apparatus connected to the digital signal receiver apparatus; and   performing the authentication to said external signal transmitter apparatus by said transmission packet and received packets.   
     
     
         14 . A digital signal processing method using a digital signal receiver apparatus which has at least one input terminal including an input terminal from said digital signal bus and a switching circuit for selecting said input terminal, comprising the steps of:
 when said input terminal connected to said digital signal bus is selected by said switching circuit;   converting an instruction from a controller, to transmission packets and converting received packets to an instruction to said controller in a packets processing circuit;   transmitting said transmission packets from the packets processing circuit to said digital signal bus and receiving said received packets from said digital signal bus to said packets processing circuit via a digital signal bus input/output circuit by a bus control circuit;   requesting authentication by said transmission packets from said digital signal receiver to an external digital signal transmitter apparatus connected to the digital signal receiver apparatus; and   performing the authentication to said external signal transmitter apparatus by said transmission packets and received packets.   
     
     
         15 . A digital signal processing method using a digital signal receiver apparatus which has a controller, comprising the steps of:
 when said controller searches for an external digital signal transmitter apparatus connected to said digital signal bus and then finds an external digital signal transmitter apparatus;   converting an instruction from a controller, to transmission packets and converting received packets to an instruction to said controller in a packets processing circuit;   transmitting said transmission packets from the packets processing circuit to said digital signal bus and receiving said received packets from said digital signal bus to said packets processing circuit via a digital signal bus input/output circuit by a bus control circuit;   requesting authentication by said transmission packets from said digital signal receiver to said external digital signal transmitter apparatus connected to the digital signal receiver; and   performing the authentication to said external signal transmitter apparatus by said transmission packets and received packets.   
     
     
         16 . A digital signal processing method using a digital signal receiver apparatus which has a controller, comprising the steps of:
 when said controller finds an external digital signal transmitter apparatus which is transmitting a digital video signal and/or a digital audio signal;   converting an instruction from a controller, to transmission packets and converting received packets to an instruction to said controller in a packets processing circuit;   transmitting said transmission packets from the packets processing circuit to said digital signal bus receiving said received packets from said digital signal bus to said packets processing circuit via a digital signal bus input/output circuit by a bus control circuit;   requesting authentication by said transmission packets from said digital signal receiver to said external digital signal transmitter apparatus connected the digital signal receiver; and   performing the authentication to said external signal transmitter apparatus by said transmission packets and received packets.   
     
     
         17 . A digital signal processing method using a digital signal receiver apparatus which has a controller, comprising the steps of:
 when said controller finds an external digital signal transmitter apparatus which is transmitting a digital video signal and/or a digital audio signal that cannot be copied freely;   converting an instruction from a controller, to transmission packets and converting received packets to an instruction to said controller in a packets processing circuit;   transmitting said transmission packets from the packets processing circuit to said digital signal bus and receiving said received packets from said digital signal bus to said packets processing circuit via a digital signal bus input/output circuit by a bus control circuit;   requesting authentication by said transmission packets from said digital signal receiver to said external digital signal transmitter apparatus connected to the digital signal receiver; and   performing the authentication to said external signal transmitter apparatus by said transmission packets and received packets.   
     
     
         18 . A digital signal processing method using a digital signal receiver apparatus which has a controller, comprising the steps of:
 when said controller finds an external digital signal transmitter apparatus which was previously registered;   converting an instruction from a controller, to transmission packets and converting received packets to an instruction to said controller in a packets processing circuit;   transmitting said transmission packets from the packets processing circuit to said digital signal bus and. receiving said received packets from said digital signal bus to said packets processing circuit via a digital signal bus input/output circuit by a bus control circuit;   requesting authentication by said transmission packets from said digital signal receiver to said external digital signal transmitter apparatus connected to the digital signal receiver; and   performing the authentication to said external signal transmitter apparatus by said transmission packets and received packets.   
     
     
         19 . A digital signal processing method using a digital signal receiver apparatus which has a controller, comprising the steps of:
 when said controller finds an external digital signal transmitter apparatus which said digital signal receiver apparatus received a digital video signal and/or a digital audio signal from in the past;   converting an instruction from a controller, to transmission packets and converting the received packets to an instruction to said controller in a packets processing circuit;   transmitting said transmission packets from the packets processing circuit to said digital signal bus and receiving said received packets from said digital signal bus to said packets processing circuit via a digital signal bus input/output circuit by a bus control circuit;   requesting authentication by said transmission packets from said digital signal receiver to said external digital signal transmitter apparatus connected to the digital signal receiver; and   performing the authentication to said external signal transmitter apparatus by said transmission packets and received packets.