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Schematic of an AGC used in the analog telephone network; the feedback from output level to gain is effected via a Vactrol resistive opto-isolator.. Automatic gain control (AGC) is a closed-loop feedback regulating circuit in an amplifier or chain of amplifiers, the purpose of which is to maintain a suitable signal amplitude at its output, despite variation of the signal amplitude at the input.
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Discord Nitro subscribers received a free "What's Up Wumpus" sticker pack focused on Discord's mascot, Wumpus. [99] In May 2023, Discord made most stickers free to all users. In October 2022, the "Discord Nitro Classic" subscription tier was replaced by a $2.99 "Discord Nitro Basic", which features a subset of features from the $9.99 "Nitro" tier.
Automatic gain control, intentional non-linearity and incidental non-linearity limit the output amplitude in various implementations of the oscillator. The circuit shown to the right depicts a once-common implementation of the oscillator, with automatic gain control using an incandescent lamp.
This is the normal internal signal routing in common combination devices marketed as compressor-limiters, where an RMS compressor (for general gain control) is followed by a fast peak-sensing limiter (for overload protection). Done properly, even heavy serial compression can sound natural in a way not possible with a single compressor.
MusicBee can be configured to monitor and perform this task automatically for select libraries, while at the same time allowing users to take manual control on a case-by-case basis. Scrobbling: ability to share current playback information from MusicBee to Last.fm .
Another type of normalization is based on a measure of loudness, wherein the gain is changed to bring the average loudness to a target level. This average may be approximate, such as a simple measurement of average power (e.g. RMS), or more accurate, such as a measure that addresses human perception e.g. that defined by EBU R128 and offered by ReplayGain, Sound Check and GoldWave.
The open-loop gain is a physical attribute of an operational amplifier that is often finite in comparison to the ideal gain. While open-loop gain is the gain when there is no feedback in a circuit, an operational amplifier will often be configured to use a feedback configuration such that its gain will be controlled by the feedback circuit components.