| 摘要 |
<p>PURPOSE:To eliminate the need of plural expensive electronic volumes even at the time of the need of varying the levels of many items by switching and controlling plural control items by one electronic volume. CONSTITUTION:The modulation signal inputted to an input terminal 4-1 is inputted to an electronic volume l through a close switch 10-1. Electronic volume designating data from a microcomputer passes a shift register 2 from a data signal input terminal 7 and is inputted to the electronic volume 1 through a data bus 20 and is written in the volume, to which the modulation signal is inputted, out of four incorporated volumes. During adjustment, the graduated set value of this volume is read through the data bus 20 and is stored in an E<2>PROM 3. The modulation signal inputted to the input terminal 4-1 is outputted to a corresponding output terminal 5-1 after level adjustment.</p> |
