| 摘要 |
PURPOSE:To improve the operability of a button by displaying the curved waveform of frequency characteristic of a graphic equalizer and a sound volume signal adding a setting sound volume signal thereto onto a same display device. CONSTITUTION:When a balancing operation button 7 for an input device 6 is operated to a desired frequency characteristic, a frequency characteristic is set to a graphic equalizer 1 by a microcomputer 3, the frequency characteristic curve is stored in a RAM 5 and the curved waveform of frequency characteristic 11 is displayed on a cathode ray tube display device 10 of a display and operation device 13. Then a sound volume adjustment operating button 8 of an input device 6 of the display and operation device 13 is operated to adjust the sound volume of a sound volume control circuit 2, then the frequency characteristic curve waveform 11 and the sound volume signal waveform 9 are inputted to the device 10, where they are displayed with an interval 12. Every time the adjustment button 8 is adjusted, the lever of the sound volume signal is detected at a glance corresponding to the adjustment depending on the size of the interval 12. |
