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H

HARMONIC DISTORTION The presence of harmonics in the output signal of a device, which were not present in the input signal.

HIGH PASS FILTER See Filter

HYPER-CARDOID MICROPHONE As with a Cardoid microphone, but the Hypercardoid is even more resistant to off-axis sound sources.... used in outside broadcasting alot due to it's ability to reject sound sources other than those directly in front.