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Block diagram of the signal-flow for a common feedback loop [1]: 118 . Audio feedback (also known as acoustic feedback, simply as feedback) is a positive feedback situation that may occur when an acoustic path exists between an audio output (for example, a loudspeaker) and its audio input (for example, a microphone or guitar pickup).
Audio feedback from microphones occurs when a microphone is too near a monitor or main speaker and the sound reinforcement system amplifies itself. Audio feedback through a microphone is almost universally regarded as a negative phenomenon, many electric guitarists use guitar feedback as part of their performance. This type of feedback is ...
A talkback microphone in a recording studio. In sound recording, a talkback system is the intercom used in recording studios and production control rooms (PCRs) in television studios to enable personnel to communicate with people in the recording area or booth.
Here, the still-mic-level signal enters into a microphone preamplifier, which boosts the signal voltage to line level. For this example, the microphone preamplifier is built into a mixing board. It is typical for a mixing board to include a line trim after the preamplifier. This allows the amplitude of the now line-level signal to be adjusted.
This muting prevents the speaker from hearing their own voice returning from the far end. Echo cancellation involves first recognizing the originally transmitted signal that re-appears, with some delay, in the transmitted or received signal. Once the echo is recognized, it can be removed by subtracting it from the transmitted or received signal.
Pre-fade auxiliary sends can provide a monitor mix to musicians on stage (which they hear through monitor speakers pointing at the performers or in-ear monitors); this mix is thus independent of the main mix produced by the faders. Program channels on a radio soundboard. Most live radio broadcasting soundboards send audio through program ...
As such, a microphone is much more likely to feedback through the monitor loudspeakers than the main PA. Ringing out can become quite complex when working with a large number of microphones and monitors. Indeed, with larger touring acts, one of the major advantages of using in-ear monitors is the minimal ringing out that needs to be done.
An echo chamber is a hollow enclosure used to produce reverberation, usually for recording purposes. A traditional echo chamber is covered in highly acoustically reflective surfaces. By using directional microphones pointed away from the speakers, echo capture is maximized. Some portions of the room can be moved to vary the room's decay time.