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A Digital Control Unit for Loudspeaker Arrays

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Amplitude shading and fase shading are readily used methods to gain control over the directivity of a loudspeaker array. The results are limited by the analogue techniques that are employed. Implementation of digital signal processing will overcome these disadvantages resulting in a nearly compromiseless control. The use of FIR-filters for this purpose will be discussed, as well as techniques to compensate for the effect of temperature and airflow on the alignment of the individual array elements. Application of this approach has lead to the design of a DSP-based modular array control unit.

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AES - Audio Engineering Society