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n. [Geophysics]
The exponential rate constant (τ) that determines how quickly the output amplitude of an electrical signal that is under automatic gain control (AGC) responds to a sudden increase or decrease in input signal amplitude. Mathematically,
t) = A(_{i}t) + ΔA (1 − e_{i}^{−t/τ}) where A is the input signal amplitude (_{i}A), Δ_{i}A is the change in input signal amplitude and _{i}t is time. When t equals τ, the function (1 − e^{−t/τ}) equals (1 − 1/e) equals 0.63. Therefore, the AGC time constant (τ) is the amount of time that elapses for the output signal of AGC to reflect 63% of the change in the input signal amplitude. |

5/24/2019