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Parabolic Reflector Microphones

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The paper presents a series of measurements on the behaviour of parabolic reflector microphones. The measurements include gain, sound pressure distribution, and directional properties. These results indicate that although it is easy to obtain considerable high-frequency acoustical gain, the usable angle is extremely narrow, and having the source at a non-ideal position (near-field or off-axis) leads to a geometrical distortion of the focal point, reducing the high-frequency gain. The potential benefit of directional microphones and the theoretical gain properties are discussed.

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