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Entries found for search: feedback

acoustic feedback : A squealing sound when the output of an audio circuit is fed back in phase into the circuit’s input. See feedback.

electronic feedback : See feedback.

feedback : There are two types of audio feedback: acoustic and electronic. (1) Acoustic feedback is where a gain control is set too high in a sound reinforcement system and the amplified sound enters the microphone and is reamplified until a steady howl or whistle is heard. This is also called regeneration. (2) Electronic feedback (or negative feedback) involves the application of a small portion of the output voltage of an amplifier to the input so as to cancel part of the input signal, reducing the gain of the amplifier, but also reducing the distortion and noise introduced by the amplifier. See bootstrap. (3) A specific application of feedback in FM synthesis, where at least one operator in each algorithm is equipped with a feedback loop.

motional feedback : A type of mechanical negative feedback where the actual motion of the cone of a low-frequency loudspeaker is used to generate a signal that is fed back to the amplifier. The motion of the cone itself is then inside the feedback loop, and distortion can be significantly reduced. In all motional feedback schemes, great care must be exercised to ensure that the system is stable. This means that phase-shift between the drive signal and the feedback signal must be accurately controlled.

negative feedback See feedback.

delay line feedback : A type of modulation which creates a series of echoes when the modulation source is boosted. The greater the amount of feedback, the more repetitions of each echoed event.

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