利用内插法提高多相滤波器采样率的设计

The Design of Heightening Sampling Rate for Polyphase Filter by Interpolation

在一些需要进行D/A(数字/模拟)变换的场合,常常需要提高数字信号的采样率以降低对模拟滤波器的要求。我们介绍的多项滤波器能工作在低的采样率下,而产生高采样率的信号,且保证结果不发生频谱混叠。文章最后介绍了一种已经集成了这种滤波器的芯片。

When implementing the D/A conversion, the sample rate of digital signal is often need to be increased to reducing the requirement of analog filter. The polyphase filter can work in low sample rate, and generate signal in high sample rate, while preventing the spectrum from alias. Finally, a chip integrating such filter is introduced.