| 摘要 |
PURPOSE:To remove interference between codes by adjusting gains of emphasis circuits at an equivalent frequency according to whether output voltages of peak detecting circuits are greater or less than a reference voltage. CONSTITUTION:When interference between codes occurs in the output of variable gain circuit 2, output levels of peak voltage detecting circuit 71, 72...7N are over or short in the reference voltage. When those output levels are greater than reference voltage Vref, outputs of control circuits 81, 82...8N decrease and consequently, gains of emphasis circuits 91, 92...9N are decreased. On the other hand, when output levels of peak voltage detecting circuits 71, 72...7N are less than reference voltage Vref, outputs of control circuits 81, 82...8N increase, and consequently gains of emphasis circuits 91, 92...9N are increased. Such control removes the interference between codes by making use of the outputs of emphasis circuits. |
