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提出了一种滤波器组架构,用于对音频信号进行数字化处理。此架构包括:CIC滤波器、第一级半带滤波器、第二级半带滤波器、补偿滤波器、高通滤波器。通过对滤波器组进行建模仿真,分析了其主要参数对性能的影响,对电路结构进行了优化,使该级联结构能够有效降低运算量,滤除基带信号带外噪声,并提高整个链路的信噪比。
A filter bank architecture is proposed for digitizing audio signals. This architecture includes: CIC filter, the first half-band filter, the second half-band filter, compensation filter, high-pass filter. Through the modeling and simulation of the filter banks, the influence of the main parameters on the performance is analyzed, and the circuit structure is optimized so that the cascaded structure can effectively reduce the computation load, filter out the out-of-band noise of the baseband signals and improve the entire chain Road signal to noise ratio.