Smart directional and diffuse digital loudspeaker arrays
Abstract- 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...
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| Format: | Text |
| Language: | English |
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2001
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.211.5078 http://www.essex.ac.uk/ese/research/audio_lab/malcolmspubdocs/C114%20Smart%20loudspeaker%20array.pdf |
| Summary: | Abstract- 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 DML distributed-mode loudspeaker SDM sigma-delta modulation TDI temporally diffuse impulse response ADC analogue-to-digital conversion DETn digital elemental transducer with n-bit DAC digital-to-analogue conversion resolution PWM pulse-width modulation LPCM linear pulse-code modulation FIR finite-impulse response 1 |
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