| 摘要 |
PROBLEM TO BE SOLVED: To provide a new method that monitors the output value level of electronic equipment which is represented by the output value level, etc., of audio sound. SOLUTION: An amplifier 4 integrates electric signals that are issued each time a function key of a key board 2 is pressed down, and the sound output of an audio speaker 5 is set by this integrated value. Meanwhile, the electric signals are also integrated in a microcontroller 1, and the number of indicator lamps 2-1 to 2-5 to be turned on is changed in accordance with this integrated value. Then, it is possible to visually monitor the set value of the sound output of the speaker 5 according to the number of indicator lamps that are turned on.
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