Microphone array and method and module for calibrating same

Abstract

The embodiment of the invention discloses a method for calibrating a microphone array, which comprises the following steps: acquiring a noise signal in audio signals inputted in each sound channel; calculating the acoustic correlation of the noise signal in the audio signals inputted in each sound channel; when determining that the acoustic correlation exceeds a set correlation threshold, acquiring a gain average value of each sound channel; and adjusting the gain of each sound channel according to the gain average value. The embodiment of the invention also provides the corresponding microphone array and a module for calibrating the microphone array. The technical scheme of the method adopts the noise signal in the environment as a calibrating reference sound source without a fixed calibrating sound source, so the microphone array can be calibrated by utilizing noises in the environment anytime and anywhere, and the method supports startup calibration and is very convenient to use for users.

Description

technical field [0001] The invention relates to the technical field of microphones, in particular to a microphone array and a calibration method and module for the microphone array. Background technique [0002] At present, the use of array microphones is gradually increasing, and various types of microphone arrays have been produced, such as: suspension microphone arrays, disk microphone arrays, and matrix microphone arrays. These types of array microphones generally use regular arrays Multiple microphones at different positions collect sound and input it to the interior for digital signal processing (DSP, Digital Signal Processing), which is used to realize sound source localization, sound field detection, eliminate background noise, and detect whether the sound source in each direction is stereo or multi- channel functions, etc. However, since each individual microphone in the array microphone has a certain difference, no matter how big or small, the difference exists ab...

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Problems solved by technology

[0005] However, in the process of research and practice of the prior art, the inventors of the present invention have found that the above method needs to place a special device for calibration, and due to the need for special devices (such as figure 1 Acoustic drums for calibration shown), are generally bulky and bulky to carry, and therefore cannot be used as an accessory to a microphone array

Usually it can only be used for factory or acceptance calibration, and real-time calibration cannot be performed. Once a certain microphone has a large drift effect with time, temperature, vibration, static electricity and other related factors, the above calibration will be invalid.

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