Abstract
A circular transducer array ( 30 ) is provided for use in recording a sound field. The array ( 30 ) comprises a plurality of microphones ( 31 a –31 h ), 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.
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