howl

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howl

Electronics an unwanted prolonged high-pitched sound produced by a sound-producing system as a result of feedback

howl

[hau̇l]
(engineering acoustics)
Undesirable prolonged sound produced by a radio receiver or audio-frequency amplifier system because of either electric or acoustic feedback.
References in classic literature ?
While the Duchess sang the second verse of the song, she kept tossing the baby violently up and down, and the poor little thing howled so, that Alice could hardly hear the words:--
Although he had not howled once, his snarling and growling, combined with his thirst, had hoarsened his throat and dried the mucous membranes of his mouth so that he was incapable, except under the sheerest provocation, of further sound.
Then he sat down, pointed his nose upward, and howled.