| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of sound quality variation resulting from attachment of an window screen effectively as a microphone itself. SOLUTION: Equalizers 13-1 and 13-2 set with equalizing characteristics capable of correcting sound quality variation when an window screen 5 is attached are provided, and attachment/nonattachment state of the window screen 5 is detected using two phototransistors 4-1 and 4-2. Based on the detection results, the equalizers 13-1 and 13-2 are switched to be effective when the window screen 5 is attached and to be ineffective when it is not attached. COPYRIGHT: (C)2005,JPO&NCIPI |
