| CPC H03G 3/3036 (2013.01) [H04B 1/16 (2013.01); H03G 2201/103 (2013.01); H03G 2201/307 (2013.01)] | 16 Claims |

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1. A signal processing apparatus comprising:
an amplifier that controls a gain according to a count value to amplify a signal;
a comparator that compares the signal outputted by the amplifier with the count value; and
an accumulator that counts the count value according to an output from the comparator.
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