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Principle and Application of Digital Microphone

Author:admin   AddTime:2021-05-09

Introduction to digital microphones

With the increasing development of IT technology, the proportion of digital circuits in various electronic systems is increasing, especially in the multimedia audio and video applications of PCs and the 3G mobile phone applications that have appeared on the market. The input quality of audio signals and the resistance to the outside world are different. These interference capabilities have put forward higher requirements. These requirements have been difficult to achieve by the improvement of the acoustic performance of traditional analog microphones. However, through the algorithmic processing of the audio digital signal of the microphone array, it is ideal to achieve the elimination of echo, Shield noise, enhance beam directivity and other required effects. The premise of all this is that the processed audio signal must be in the form of a digital signal that has undergone A/D conversion. As mentioned above, the market demand prospects for digital microphones are beyond doubt.



1. The principle of digital microphone
Principle of Digital Microphone A digital microphone, as its name implies, is a microphone electroacoustic device that directly outputs a digital pulse signal. From the perspective of application, it can be divided into two categories: one is a microphone with a USB interface, and its electro-acoustic transducer is still an analog audio output signal, which is converted into a digital signal in PC format after A/D encoding and a USB interface chip. Interface, most of these microphones are used as PC peripherals, such as USB interface handheld microphones, USB interface headsets, etc. Strictly speaking, such microphones should be called digital interface microphones. The other type is a true digital microphone. This type of microphone uses a built-in pre-gain and A/D encoding IC chip. As an electro-acoustic transducer, the direct output is a digital pulse signal, which can be directly connected with the corresponding codec chip. The (CODEC) interface transmits digital signals. This article focuses on the principle and application of such digital microphones.

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