| 摘要 |
PURPOSE:To perform level matching of plural channels readily and automatically by providing a comparator, matching the output outside a reference channel to the channel of the reference channel and automatically making the levels variable. CONSTITUTION:Reference reproduction channel input is reproduced with a speaker 9 and is supplied via rectifier parts D2, C2, R6 to a comparator 11, and the other channel input 2 is supplied via rectifier parts D1, C1, R5 to the comparator 11. Both signals are compared of their magnitudes in the comparator 11 and according to the difference thereof, the gain of an electronic volume 12 is controlled and the input are reproduced with a speaker 10. Hence, when the voices from a microphone are inputted to the input part 2 and the performances, etc. having been recorded to the input part 1, then the reproduction output from the speaker 10 may be made constant with respect to the reproduction level of the speaker 9 and level matching may be preformed automatically. |
