Patent ID: 7178157

Claim:
An information transmission system comprising: at least one information output apparatus configured to output an information signal, including an output terminal configured to output an analog signal, a related information sending unit configured to send a digital signal including at least specific information regarding the at least one information output apparatus, and an information-for-identification superimposing unit configured to superimpose information for identification onto the analog signal to be output from the output terminal; and an information input apparatus configured to accept the analog signal from the at least one information output apparatus, including plural input terminals configured to accept analog signals, a specific information accepting unit configured to accept the digital signal including the specific information, a switching unit configured to switch among the plural input terminals, an information-for-identification detecting unit configured to detect the information for identification superimposed on one of the analog signals that are accepted by a respective one of the plural input terminals, and to cause the switching unit to switch among the plural input terminals, and an identifying unit configured to transmit a digital signal to the at least one output apparatus that identifies the respective one of the plural input terminals that received the analog signal with the information for identification superimposed thereon.