Abstract: A sound distortion suppression control method not causing sound distortion even if the volume of an amplifier is increased to nearly its maximum value when the user adjusts bass and treble to obtain desired tone. Sound to be output is specified by a volume setting value, a bass setting value and a treble setting value, and these values are temporarily stored in a memory section. Furthermore, a maximum allowable bass value and a maximum allowable treble value are respectively stored in the memory section in advance. In the case that the bass setting value and the treble setting value become larger than the maximum allowable bass value and the maximum allowable treble value, respectively, the bass setting value and the treble setting value are changed to a value not more than the maximum allowable bass value and a value not more than the maximum allowable treble value, respectively.

Abstract: To start robot training before an actual robot is manufactured or installed, the robot operation training system has a controller substantially the same as the actual robot controller and a personal computer for simulating the functions of the robot body. The training system can be applied easily to various robots of different models.