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What causes the feedback (a noise increasing in intensity and pitch) sometimes heard when people speak through microphones? I'm sure I have enough background to understand an explanation, I've just never thought about it before.
Feedback is a phenomenon where a sound or signal is picked up and amplified, creating a loop that increases in intensity and pitch.
Feedback in audio systems is primarily caused by the interaction between the microphone and the speakers. When the microphone picks up sound from the speakers, it amplifies and sends it back to the speakers, creating a loop that leads to feedback.
Several factors can contribute to feedback including the distance between the microphone and speakers, the sensitivity of the microphone, and the volume of the speakers. Additionally, the acoustics of the room and the type of microphone and speakers can also play a role.
To prevent feedback, it is important to adjust the volume levels of the microphone and speakers, as well as the distance between them. Using directional microphones and adjusting the positioning of the speakers can also help reduce the likelihood of feedback. Additionally, using a feedback suppressor or equalizer can also help prevent feedback in audio systems.
While feedback is generally considered undesirable, it can be used creatively in certain situations, such as for special sound effects or in certain types of music performances. However, in most cases, efforts should be made to prevent feedback as it can be disruptive and unpleasant for listeners.