Smart directional and diffuse digital loudspeaker arrays
نویسنده
چکیده
A theory of smart loudspeaker arrays is described where a modified Fourier technique yields complex filter coefficients to determine the broadband radiation characteristics of a uniform array of micro drive units. Beam width and direction are individually programmable over a 180-degree arc, where multiple agile and steerable beams carrying dissimilar signals can be accommodated. A novel method of diffuse filter design is also presented that endows the directional array with diffuse radiation properties. . Abbreviations used in paper 1 This study was undertaken for NXT Transducers plc, UK. 2 Technical consultant for NXT Transducers plc, UK. DML distributed-mode loudspeaker TDI temporally diffuse impulse response DETn digital elemental transducer with n-bit resolution LPCM linear pulse-code modulation SDM sigma-delta modulation ADC analogue-to-digital conversion DAC digital-to-analogue conversion PWM pulse-width modulation FIR finite-impulse response
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