| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce noise by making it possible to decrease the resistance at an attenuation portion which is connected to an input terminal. <P>SOLUTION: An electronic volume includes an attenuation portion 1, having the input side which is connected to an input terminal 7; an attenuation portion 2 having the input side which is connected to the maximum attenuation end of the attenuation portion 1; and an attenuation portion 3 having the input side which is connected to the maximum attenuation end of the attenuation portion 1. The output sides of the attenuation portions 1, 2 and 3 are connected to the input side of an output buffer 6 having a high input impedance, respectively via a switch S1, and via a switch S2, and attenuation portions 4, 5 and via a switch S3. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
