Abstract
An Automatic Gain Control system using linear feedback with loop dynamics independent of input level is described. It avoids the need for the logarithmic and exponential conversions of Ricker’s method by using two ’’complementary’’ feedback loops. Response of the system to input amplitude changes is calculated, and compared with that of conventional linear AGC. Experimental results are shown. This paper is in response to D. W. Ricker [’’Nonlinear feedback system for the normalization of active sonar returns,’’ J. Acoust. Soc. Am. 59, 389–396 (1976)] where he describes the utility of input-level-invariant time constants for AGC in sonar echo processing.
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