| 摘要 |
PURPOSE:To obtain a stable and high-accuracy time constant, by forming the time constant circuit in the feedback line of an AGC circuit with a digital integral network. CONSTITUTION:The level of the output signal OUT increases as that of the input signal IN increases. The signal OUT is transferred to the absolute value circuit 4 after sampled through the A/D converter 3. The circuit 4 converts the AC signal into the DC signal to transfer it to the digital integral network 5. Thus an average level is delivered covering a long time of the digital signal to be fed back via the D/A converter 7 and in the form of the control signal CONT of the gain control circuit 1. |
