VARIABLE ADJUSTMENT SYSTEM, SOUND VOLUME ADJUSTMENT SYSTEM, EQUALIZER ADJUSTMENT SYSTEM, VARIABLE ADJUSTMENT APPARATUS, SOUND VOLUME ADJUSTMENT APPARATUS, AND EQUALIZER ADJUSTMENT APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a variable adjustment system and the like which can easily adjust the value capable of being set by both of a music apparatus and an external device when the music apparatus is connected to the external device.;SOLUTION: The portable music apparatus 1 is connected to an external amplifier 2 by a 4-pole stereo mini-plug cable 4. When detecting connection of a plug at a line input terminal 21, the external amplifier 2 uses one-pole of the stereo mini-plug cable 4 to output a control signal to the portable music apparatus 1. When the portable music apparatus 1 analyzes the control signal and detects the connection of the external amplifier 2, the portable music apparatus 1 keeps its sound volume constant to inhibit operations of a sound volume key. A user sets the sound volume by the external amplifier 2 only.;COPYRIGHT: (C)2007,JPO&INPIT