An expander is a special amplifier whose gain varies with the input level. It has an extended threshold below which the sound signal is boosted. The process of reducing the signal gain when the signal level is lowered, or increasing the signal gain when the signal level is raised, or both, is called "expansion", that is, when the signal level is low (under the extended threshold) When the gain is low, the program sound is attenuated. When the signal level increases above the threshold, the gain increases. The expander increases the dynamic range of the program tone by making the strong signal louder and the weaker signal weaker. The expander can also be used as a noise reducer such that the noise to be removed is below a predetermined threshold point and the desired signal is above the threshold point.
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