The gun microphone is actually a super-directional microphone. The design method is to place a long tube in front of the diaphragm of the omnidirectional or unidirectional microphone. The sides of the long tube are equally spaced and open at the front end of the tube. A number of equal slits are formed into the sound holes, which are covered by a layer of acoustically resistive material. In this way, the sound on the axis can be continuously passed, and the sound close to the axis is proportionally delayed, thereby causing partial cancellation of the sound, especially the cancellation of the high frequency band is more obvious, so as to achieve the purpose of reducing the sensitivity. The frequency response is generally 30 Hz to 10 kHz, and the receiving angle varies with frequency. The gun-type microphone is divided into a long-gun type and a short-gun type according to the length of the tube, and the long-gun type has a sharper pointing angle and higher sensitivity than the short-gun type.
The gun microphone is used to pick up clear sounds when it is far away from the sound source, to remove the surrounding noise to obtain a good signal-to-noise ratio, and is often used for simultaneous recording of movies or TV programs.
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