MICROPHONE ARRAYS FOR HIGH RESOLUTION SOUND FIELD RECORDING

摘要

A circular transducer array (30) is provided for use in recording a sound field. The array (30) comprises a plurality of microphones (31a-31h), a digital signal processor (33), frequency compensation filters (34) and a sum and difference network (35). The digital signal processor calculates the Fourier transform of sampled output signals from the transducers to produce a plurality of sound wave components specifying the sound field. The frequency compensation network (34) equalises each component using Bassel functions to flatten the apparent response of the array (30) and the sum and difference network (35) then combines the equalised components to provide a plurality of audio signals which represent the sound field.