Two-Dimensional FIR Filter Design on Wideband Speech Enhancement in Microphone Array
Due to complexity of sound environment, the performance of speech enhancement is degraded greatly based on traditional beam-forming when directivity of arrival of sound and number of sound are not been estimated precisely. In this paper, according to characteristics of handle-communicated equipment, a method on suppression of environmental noise and disturbance is provided. Beam-forming on speech wideband in desired angle is realized by designing a two-dimensional FIR filter which has fan structure in pass-band and wedge-shaped structure in transition-band. The filter can suppress noise and disturbance out of main-lobe desired. The simulations demonstrated that the filter designed is effective.
X. F. Su and X. H. Zhang, "Two-Dimensional FIR Filter Design on Wideband Speech Enhancement in Microphone Array", Applied Mechanics and Materials, Vol. 39, pp. 260-266, 2011