Poletti M, Fazi F M, Nelson P A
Industrial Research Ltd, PO Box 31-310, Lower Hutt 5040, New Zealand.
J Acoust Soc Am. 2010 Jun;127(6):3590-601. doi: 10.1121/1.3409486.
Sound reproduction systems using open arrays of loudspeakers in rooms suffer from degradations due to room reflections. These reflections can be reduced using pre-compensation of the loudspeaker signals, but this requires calibration of the array in the room, and is processor-intensive. This paper examines 3D sound reproduction systems using spherical arrays of fixed-directivity loudspeakers which reduce the sound field radiated outside the array. A generalized form of the simple source formulation and a mode-matching solution are derived for the required loudspeaker weights. The exterior field is derived and expressions for the exterior power and direct to reverberant ratio are derived. The theoretical results and simulations confirm that minimum interference occurs for loudspeakers which have hyper-cardioid polar responses.
在房间中使用扬声器开放阵列的声音重放系统会因房间反射而出现音质下降的问题。这些反射可以通过对扬声器信号进行预补偿来减少，但这需要在房间内对阵列进行校准，并且处理器负担较重。本文研究了使用固定指向性扬声器球形阵列的三维声音重放系统，该系统可减少阵列外部辐射的声场。针对所需的扬声器权重，推导了简单声源公式的广义形式和模式匹配解。推导了外部声场，并得出了外部功率和直达混响比的表达式。理论结果和模拟证实，具有超心形极响应的扬声器产生的干扰最小。
