| 摘要 |
<p>In a sound volume circuit (100), an attenuation coefficient setting register (28) holds an attenuation coefficient "b". When a stop instruction STOP becomes active, an output signal "a" from a first multiplexer (14), i.e., a processing object signal "in" is multiplied by the attenuation coefficient "b" by a multiplier (16), and the output signal "c" is outputted via a second multiplexer (18), a first flip-flop (20), and a third multiplexer (22). A multiplication master counter (38) holds the number of times the processing object signal "in" acquired by one sampling is multiplied by "b". The multiplication master counter (38) counts up by using a timer (36). A multiplication temporary counter (32) loads the output signal from the multiplication master counter (38) at the assert of an acquisition timing signal "L". The process from the first multiplexer (14) to the first flip-flop (20) is repeated by the number of times of the multiplication temporary counter (32).</p> |
