Affiliation:
1. Institute INAOE Puebla, Mexico
Abstract
Downsampling is the process of decreasing the sampling rate of signal by an integer. This process may introduce the unwanted spectrum replica called aliasing. To avoid aliasing the signal must be filtered by decimation filter prior downsampling. Decimation consists of filtering and downsampling. The most simple decimation filter is comb filter usually used in the first stage of decimation. However, comb filter does not provide a good aliasing rejection. This paper presents the methods for improving alias rejection of comb filters. The methods are based on comb zero rotation, cosine filters, Chebyshev polynomials, and cascade of combs with different parameters.
Reference16 articles.
1. Chebyshev Stopbands for CIC Decimation Filters and CIC-Implemented Array Tapers in 1D and 2D
2. Garcia Robles, A., & Jovanovic Dolecek, G. (2016). On non-recursive comb-cosine decimation structures. In Proceedings of the IEEE Latin American Symposium on Circuits and Systems LASCAS 2016, (pp. 1-4), Florianapolis, Brazil: IEEEXplore.
3. An economical class of digital filters for decimation and interpolation
4. Simplified rotated sinc (RS) filter for sigma-delta A/D converters
5. Jovanovic Dolecek, G., & Fernandez-Vazquez, A. (2012). On non recursive rotated comb filter, In Proceedings of Midwest Symposium MWSCAS 2012, (pp. 474-477). Boise, ID: IEEEXplore.