Howtosignalprocessing
- What is the function of Automatic Gain Control or AGC?
- Why is delayed AGC used?
- What is the use of gain control in radar?
- What is the role of AGC in superheterodyne receiver?
What is the function of Automatic Gain Control or AGC?
AGC is a system that controls the increase in the amplitude of an electrical signal from the original input to the amplified output, automatically. AGC is used in data processing to improve the visibility of seismic data in which attenuation or spherical divergence has caused amplitude decay (Figure 5.3).
Why is delayed AGC used?
A delayed automatic gain control circuit using a simple delayed AGC voltage generation section and capable of fixing a start point of AGC in an RF amplification section at a predetermined received signal level without performing a special adjusting operation even if there are variations in the characteristics of ...
What is the use of gain control in radar?
Gain control is necessary to adjust the receiver sensitivity for the best reception of signals of widely varying amplitudes. A complex form of automatic gain control (agc) or instantaneous automatic gain control (iagc) is used during normal operation.
What is the role of AGC in superheterodyne receiver?
The DC voltage is used to automatically adjust the gain of the IF amplifier in a control loop (AGC- automatic gain control). This maintains a constant recovered m(t) amplitude as the receiver input signal level changes, otherwise the volume would change as much as 60dB!
