off-axis rejection

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(n.) The pickup pattern for a microphone has a central axis that represents maximum sensitivity to sounds. When sounds are introduced from the sides of this axis, the sensitivity and frequency response of the microphone is much lower. Off-axis rejection is the term for the lower signal level the microphone produces in response to sounds that emanate from the sides rather than from the “sweet spot” in the center of the pickup pattern. See also microphone patterns.