Open AccessLow‐complexity technique to get arbitrary variation in the bandwidth of a digital FIR filter
Author(s) -
Haridas Nisha,
Elias Elizabeth
Publication year - 2017
Publication title -
iet signal processing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.384
H-Index - 42
eISSN - 1751-9683
pISSN - 1751-9675
DOI - 10.1049/iet-spr.2016.0055
Subject(s) - bandwidth (computing) , computer science , digital filter , half band filter , overhead (engineering) , low pass filter , finite impulse response , electronic engineering , filter (signal processing) , filter design , root raised cosine filter , algorithm , telecommunications , engineering , computer vision , operating system
A digital filter is an essential structure in present day electronic devices. There is a variety of applications which demands tunability of digital filters in terms of bandwidth. It is desirable to have simple design process and minimum possible overhead in hardware implementation. A set of very low order subfilters derived from Farrow structure is proposed to function as a sample rate converter on the input signal. A fixed bandwidth low pass filter is placed in between these interpolator structures, resulting in a continuously variable bandwidth filter (CVF). This hardware efficient CVF architecture helps to achieve the tunability without altering the coefficients and the underlying structure. This model obtains a continuous variation in bandwidth employing a single sample rate change factor. Very low complexity and easy tunability of this technique are highly motivating factors to adopt CVF in various real‐world applications.