| 摘要 |
<p>An automatic gain control system has a multiplying circuit (10) for multiplying levels of input and feedback signals. Such control system is provided with a closed loop homomorphic network connected between the output terminal of the control system and the feedback terminal of the multiplying circuit. Such homomorphic network maintains a compressed output signal level at the system's output terminal, inhibits oscillation and latching up of the main system in which this AGC system is a component, and provides low distortion and noise levels of signals processed by this AGC system; and the network includes a logarithmic amplifier (20) a convolver (30) and an exponentiator (40) which operate on the output Vo of the multiplier circuit (10) to provide a signal (V3) to be fed back to the multiplier circuit and by which an input signal Vi is multiplied to achieve the output Vo.</p> |
