Mark Poletti, Lower Hutt (NZ)
Industrial Research Limited, Lower Hutt (NZ)
A circular transducer array is provided for use in recording a sound field. The array comprises a plurality of microphones, a digital processor, frequency compensation filters and a sum and difference network. 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 equalises each component using Bassel functions to flatten the apparent response of the array and the sum difference network then combines the equalised components to provide a plurality of audio signals which represent the sound field.