一个16位定点音频重采样器的比较与实现

Conference Record of the Thirty-Eighth Asilomar Conference on Signals, Systems and Computers, 2004. Pub Date : 2004-12-01 DOI:10.1109/ACSSC.2004.1399472

W. Jin, M. Scordilis, A. Iliev

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引用次数: 3

摘要

建立了一个音频重采样器，将采样率从44.1 kHz转换为16 kHz。分别创建一个插值器和抽取器，通过一个整数因子来改变采样率。内插器和抽取器使用的低通滤波器是通过两种不同的方法获得的:即窗口法和等纹设计。根据3db带宽和通频带信噪比对这两种滤波器的性能进行了评估。滤波器采用多级插值FIR方法实现。采用多相结构进一步减少了计算量。重采样器是在16位定点仿真上实现的。所描述的方法大大减少了滤波器的顺序，从而减少了计算成本。

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Comparison and implementation of a 16-bit fixed-point audio resampler

An audio resampler is built to convert the sampling rate from 44.1 kHz to 16 kHz. An interpolator and decimator are created separately to change the sampling rate by an integer factor. The low pass filters used by the interpolator and decimator are obtained by two different approaches: namely the window method and the equiripple design. Vie performances of these two filters are evaluated in terms of 3-dB bandwidth and pass-band signal to noise ratios. The filters are implemented using the multistage interpolated FIR approach. Polyphase structures are used to further reduce the computational load. The resampler is implemented on 16-bit fixed-point simulations. The described approach drastically reduces the filter order and thus the computational cost.

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Conference Record of the Thirty-Eighth Asilomar Conference on Signals, Systems and Computers, 2004.

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