CPC H04N 9/3155 (2013.01) [G03B 21/206 (2013.01); H04N 9/3176 (2013.01); H04N 9/3179 (2013.01)] | 17 Claims |
1. A signal detection device comprising:
a first control unit; and
an input unit connected to the first control unit via a second control unit configured to be activated after the first control unit is activated and configured to input an external signal therefrom,
wherein the first control unit determines whether there has been an input of the external signal after the second control unit is activated.
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