METHOD AND APPARATUS FOR PROCESSING SIGNALS OF A SPHERICAL MICROPHONE ARRAY ON A RIGID SPHERE USED FOR GENERATING AN AMBISONICS REPRESENTATION OF THE SOUND FIELD

摘要

Spherical microphone arrays are represented by Ambsonics Dimensional sound field RTI ID = 0.0 In which the pressure distribution on the surface of the sphere is sampled by the capsules of the array. The impact of the microphones on the acquired sound field is eliminated using the inverse microphone transfer function. Equalization of the transfer function of the microphone array is a big problem because the inverse of the transfer function causes high gains for small values in the transfer function and these small values are affected by the transducer noise. The present invention minimizes the noise by using the binar filter processing 34 in the frequency domain, which is automatically controlled 33 per wavenumber by the signal to noise ratio of the microphone array.