| 摘要 |
PURPOSE:To provide a voice generating device with which the highest level and the lowest level can be adjusted easily by manual operation by using an operational amplifier capable of changing an amplifying degree by control of a feedback resistance value, and controlling the feedback resistance by a control command signal from a user program memory part read by designation by a control circuit part for changing a voice level. CONSTITUTION:An action for determining an amplifying ratio of an operational amplifier OA is performed based on control data for a voice level from a user program memory part 2 sent from a control circuit part 3. The maximum level can be changed by control of a changeable feedback resistor VR1, and the minimum level can be adjusted by a changeable feedback resistor VR2. A desired level can thus be selected by a program set at the user program memory part, and the selected voice level value can be adjusted further by manual adjustment of the changeable resistors, thereby the voice level can be set finely easily compared to conventional devices. |
