| 摘要 |
PURPOSE:To improve the operability by storing a correcting value of sound volume control as the result of comparison between an input signal and a reference value to each storage section corresponding to an input source, designating an input source and reading the stored content so as to use it for sound volume control. CONSTITUTION:A control signal to a CPU39 controlling a main variable resistor 43 is received from a storage section 30 and the CPU39 is connected to storage sections 34-36 storing the sound correction data of each input via changeover switch 38 interlocked with a changeover switch 37. The CPU39 outputs a control signal similarly as a variable resistor 49, an output of the variable resistor 49 is smoothed by a capacitor 41 via a diode 40, the result is inputted to a comparator 42, compared with a reference potential VT and an input coincident signal is inputted to the CPU39. The CPU39 writes the correcting value at that time to the storage sections 34-36. The CPU39 synthesizes the data of a storage section 30 and the corrected data of the storage sections 34-36 and its control signal controls the variable resistor 43. |
