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What is Digital Filter

A filter that performs mathematical operations on a discrete-time signal.
Published in Chapter:
Methods for Improving Alias Rejections in Comb Filters
Gordana Jovanovic Dolecek (Institute INAOE Puebla, Mexico)
Copyright: © 2018 |Pages: 15
DOI: 10.4018/978-1-5225-2255-3.ch412
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.
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Is a system that receives a digital signal and returns another digital signal with modified characteristics.
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A system that receives a digital signal and returns another digital signal with modified characteristics.
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A filter that performs mathematical operations on a sampled, discrete-time signal to reduce or enhance certain aspects of that signal.
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In signal processing, a digital filter is a system that performs mathematical operations on a sampled, discrete-time signal to reduce or enhance certain aspects of that signal. Digital filters can often be made very high order, and are often finite impulse response filters which allows for linear phase response.
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The filter is a discrete-time system, which changes the characteristics of the input discrete signal in a desired manner to obtain the discrete output signal.
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The digital system which performs digital signal processing, that is, transforms an input sequence into a desired output sequence.
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