| 摘要 |
PROBLEM TO BE SOLVED: To obtain an electronic volume device that can adjust a tone volume of a ringer with excellent operability in the case of adjusting the tone volume. SOLUTION: The electronic volume device for adjusting a ringer tone volume that is used for a telephone terminal information a user about the arrival of an incoming call by ringing of the ringer and adjusts a volume by keeping volume adjustment keys 10a, 11a depressed, consists of a control means 4A that controls volume adjustment synchronously with a ringing period of the ringer over its control period when the volume adjustment keys are operated, a sound source 14 that generates an adjustment change tone and a control means 4A that rings the adjustment change tone as its control in the case of the volume adjustment in the electronic volume device that adjusts the volume while volume adjustment keys 10b, 11b are operated.
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