Patent ID: 7395127

Claim:
A signal processing apparatus comprising: a main body; an input terminal group comprising a plurality of input terminals via which a plurality of kinds of signals are externally input; a signal processing device that performs processing on the plurality of kinds of signals externally input via said input terminal group to thereby generate a signal for at least one channel; an output terminal group comprising a plurality of output terminals via which the signal for the at least one channel generated by said signal processing device is externally output; a plurality of input terminal set devices including said input terminal group and a plurality of output terminal set devices including said output terminal group, said plurality of input terminal set devices and said plurality of output terminal set devices being removably attached to said main body; and a numbering device that detects the attached conditions of said plurality of input terminal set devices and said plurality of output terminal set devices, and automatically numbers, in sequential order, a plurality of effective terminals included in at least one of said input terminal set devices attached to said main body and said output terminal set devices attached to said main body.