| 摘要 |
Changes to the functions of an apparatus and the addition of appliances can be easily performed without needing to change the internal wiring or make connections with signal cables. A first signal processing means 151, 152 , . . . that process an input signal, a judging means for judging whether an expansion second signal processing means 160 is present, a communication means for performing data transfers between the first signal processing means and the expansion second signal processing means via wireless communication, and a control means 171 that changes, when the judging means has judged that an expansion second signal processing means is present, the processing function for an input signal by having wireless communication executed by the communication means, are provided. Also, data transfers inside the first signal processing means and the second signal processing means may be performed via wireless communication as necessary.
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