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What is the function of a directional microphone?

Author:admin   AddTime:2021-05-06

What is the function of a directional microphone?

It is currently recognized that one of the methods to improve speech intelligibility is to improve the signal-to-noise ratio through directional technology. Experiments have shown that for every 1dB increase in signal-to-noise ratio, speech comprehension will potentially increase by 10%. However, non-directional hearing aids can amplify noise and speech at the same time and cannot achieve the purpose of improving the signal-to-noise ratio.

The principle of directional microphone noise reduction is to process sounds in different directions, "pay attention to" the signal sound, "ignore" the noise strategy, improve the user's listening comfort and speech intelligibility in a noisy environment, and ultimately improve language understanding ability.



Intelligent directional microphone technology allows hearing aid users to listen more realistically and naturally. It can focus and locate according to the direction of the sound, and can reduce noise interference in other directions to ensure that the voice is fully amplified. The directional microphone makes listening in a noisy environment easier. Different from the sound pressure sensitivity of omnidirectional microphones, which are basically the same in all directions, the polarity diagrams of directional microphones can be divided into the following types: 1. Cardioid: only pick up the direction facing the microphone 2. Super Cardioid microphone 3. Omni-directional: collect all the sounds around you 4. Figure 8: usually a ribbon microphone

The adaptive directional microphone automatically changes and selects the most suitable polarity according to the conversion of the surrounding environment, which plays a role in appropriately suppressing environmental noise and improving the signal-to-noise ratio in a noisy environment.

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