| 摘要 |
PURPOSE:To reduce the area of an operation panel by controlling plural variable impedance circuits by small number of switch operations. CONSTITUTION:A push-button switch 1 consisting of an up-switch 1a for increasing and decreasing impedance of variable impedance circuits 21, 22, 23 and a down-switch 1b, a level setting push-button switch 7 for setting respective impedance levels of variable impedance circuits 21-23, and switches 15, 16, 17 for changing sound quality, balance and volume are installed. These switch operation signals are converted to specified signals by a code converter and supplied to variable impedance circuits 21-23 through gate circuits 12-14 that retain or pass the converted signal data. |
