| 摘要 |
PURPOSE:To improve the reliability of mixing by providing an electronic volume circuit adjusting an input level of each amplifier in response to an output level of each amplifier so as to adjust the input signal level of a mixing circuit to an identical level. CONSTITUTION:A signal from signal sources 121-12N is given to the 2nd amplifiers 141-14N via the 1st amplifiers 61-6N, its output is rectified and smoothed by a diode 16 and a capacitor 18 and its level controls the impedance of the electronic volume circuits 201-20N. As a result, the input level of the 2nd amplifier is adjusted and a signal with arranged levels is outputted from each 2nd amplifier and given to the mixing circuit 8. Thus, the reliability of mixing is improved much more than the circuit using manual adjustment. |
