| 摘要 |
PURPOSE:To prevent noise, by mounting a central processing unit for performing the operation of a change-over and instruction circuit for various set values of the amplifier in a specified channel on the basis of data input for showing the position of a setting and change-over switch and that of a channel change- over switch. CONSTITUTION:A signal output circuit OUT sends out a latch signal only to the latch corresponding to a specified channel on the basis of the channel specifying data from a CPU to allow said latch to latch instruction control data. For example, when a first channel is specified, the instruction control data is latched by an FF-1 latch and the data latched by the FF-1 latch becomes data for determining various settings of the first channel and the operation of instruction to be respectively outputted to input change-over devices 2-1, 3-1, a gain change-over device 4-1, a high-band filter change-over device 5-1, a low-band filter change-over device 6-1 and an instruction circuit (INST-1). Subsequently, when other channel is specified, the instruction operation of said channel is performed in the same way. |
