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Alternative Encoding Techniques for Digital Loudspeaker Arrays

机译:数字扬声器阵列的替代编码技术

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Recent developments in Digital Loudspeakers have resulted in the introduction of Digital Transducer Arrays (DTA). In most implementations, DTA loudspeakers are driven by PCM encoded audio signals, usually resampled and requantised to an appropriate number of bits, in accordance to the number of the transducers constituting the DTA topology. However, given that DTAs generally increase harmonic distortion, especially for off-axis listening positions, optimization in signal encoding and bit-to-transducer assignment, is necessary. Here, a number of novel, alternative strategies are examined, concerning the input signal encoding via PCM-to-PWM conversion, as well as techniques for bit-assignment on the transducers of a DTA. These tests are supported by simulation results and comparisons between these alternative methods, for different operating parameters.
机译:数字扬声器的最新发展导致引入了数字换能器阵列(DTA)。在大多数实现中,DTA扬声器由PCM编码的音频信号驱动,通常根据构成DTA拓扑的换能器的数量重新采样并重新量化为适当的位数。但是,鉴于DTA通常会增加谐波失真,尤其是对于离轴收听位置,因此有必要对信号编码和位到转换器进行优化。在这里,研究了许多新颖的替代策略,涉及通过PCM到PWM转换的输入信号编码,以及在DTA换能器上进行位分配的技术。对于不同的操作参数,仿真结果以及这些替代方法之间的比较为这些测试提供了支持。

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