Digital audio equalization is a very common procedure in the acoustic field that allows to improve the listening experience by adjusting the auditory frequency response. The design of graphic equalizers introduces several problems related to the necessity of implementing high performing filters with linear phase, usually characterized by high computational complexity. This paper proposes an innovative linear-phase graphic equalizer based on interpolated finite impulse response (IFIR) filters. IFIR filters seem to be suitable for a graphic equalizer thanks to their properties. In fact, they can reach very narrow transition bands, however with low computational complexity and linear phase, avoiding ripple between adjacent bands. The proposed IFIR equalizer has been compared with some state-of-the-art methods in terms of frequency response, distortion and computational cost. The experimental results have proved the effectiveness of the proposed equalizer, that has shown a considerable reduction on the computational complexity, meanwhile preserving the performances in terms of audio quality.

中文翻译：

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基于IFIR滤波器的低复杂度线性相位图形音频均衡器

数字音频均衡是声学领域中非常常见的过程，它可以通过调整听觉频率响应来改善聆听体验。图形均衡器的设计引入了一些与实现具有线性相位的高性能滤波器的必要性有关的问题，通常具有很高的计算复杂度。本文提出了一种基于内插有限脉冲响应（IFIR）滤波器的创新线性相位图形均衡器。由于其特性，IFIR滤波器似乎适合于图形均衡器。实际上，它们可以达到非常狭窄的过渡带，但是计算复杂度低且线性相位低，从而避免了相邻带之间的波动。拟议的IFIR均衡器已在频率响应方面与一些最新方法进行了比较，失真和计算成本。实验结果证明了所提出的均衡器的有效性，该均衡器在降低计算复杂度的同时，还保留了音频质量方面的性能。