What are the functions of directional microphones?

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It is now recognized that one way to improve speech intelligibility is to increase the signal-to-noise ratio through directional techniques. Tests have shown that for every 1dB increase in signal-to-noise ratio, speech intelligibility will potentially improve by 10%. Non-directional hearing aids cannot simultaneously amplify the same amount of noise and speech for the purpose of improving the signal-to-noise ratio.

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The principle of directional microphone noise reduction is to deal with different directions of sound, "pay attention" to the signal sound and "ignore" the noise strategy to improve the user's hearing comfort and speech comprehension in noisy environments, and ultimately improve speech comprehension.

Intelligent directional microphone technology enables hearing aid users to listen more realistically and naturally. It focuses and locates sound according to its direction and reduces noise interference from other directions, thus ensuring that sound can be fully amplified. Directional microphones make it easier to listen in noisy environments. Unlike omnidirectional microphones, which have the same sound pressure sensitivity in all directions, directional microphones can be divided into the following polar patterns: 1) Cardioid: only picks up the direction facing the microphone 2) Supercardioid 3) Omnidirectional: collects all the sounds around you 4) 8-way: usually an aluminum ribbon microphone

Adaptive directional microphone automatically changes and selects the most appropriate polarity according to the conversion of the surrounding environment, playing a role in noisy environments to properly suppress environmental noise and improve the signal-to-noise ratio.

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