Howtosignalprocessing
How is sinc function defined?
The sinc function , also called the "sampling function," is a function that arises frequently in signal processing and the theory of Fourier transforms. The full name of the function is "sine cardinal," but it is commonly referred to by its abbreviation, "sinc." There are two definitions in common use.
What are the properties of sinc?
Properties. The sinc function crosses zero at nonzero multiples of π; zero crossings of the normalized sinc occur at nonzero integer values.
Why is sinc function non causal?
The negative time coefficients from the sinc funtion would make the filter dependent upon infinitely many future input samples, which makes this filter design indeed, non-causal.
