What is the name of the system used to control the increase in amplitude of an electrical signal from input to output, commonly used in seismic processing?

What is the name of the system used to control the increase in amplitude of an electrical signal from input to output, commonly used in seismic processing?

• A. Automatic Gain Control
• B. Peak Limiter
• C. Signal Amplifier
• D. Gain Stabilizer

Answer: (A)

Automatic gain control is a system that dynamically adjusts amplification so the output stays within a target range. It senses the signal level and increases gain when the input is weak or reduces gain when the input is strong, rather than applying a fixed amount of boost. In seismic processing, this helps balance amplitudes across traces and over time, compensating for variations due to geometric spreading, attenuation, and differing source-receiver geometries. This makes weaker reflections more visible and prevents strong events from dominating the display, aiding interpretation. A peak limiter clamps peaks to a set threshold and can distort spectral content, a plain signal amplifier raises everything by a fixed amount without adapting to the signal level, and gain stabilizer isn’t a standard term for this purpose.

Automatic gain control is a system that dynamically adjusts amplification so the output stays within a target range. It senses the signal level and increases gain when the input is weak or reduces gain when the input is strong, rather than applying a fixed amount of boost. In seismic processing, this helps balance amplitudes across traces and over time, compensating for variations due to geometric spreading, attenuation, and differing source-receiver geometries. This makes weaker reflections more visible and prevents strong events from dominating the display, aiding interpretation. A peak limiter clamps peaks to a set threshold and can distort spectral content, a plain signal amplifier raises everything by a fixed amount without adapting to the signal level, and gain stabilizer isn’t a standard term for this purpose.