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Department of Microelectronics,Indian Institute of Information Technology, AllahabadSUBMITTED BY:Prashant singh(imi2011003)Rahul Patidar(imi2011011)
Introduction Classification Types Structures Digital Vs Analog filters Refrences
Electronic circuits which perform signal processing functions,remove unwanted frequency component, to enhance wanted ones,or both. Digital filter-Performs mathematical operations on asampled,discrete time signal to reduce or enhance certain aspectsof that signal. Filters generally do not add frequ-ency components to a signal. Boost or attenuate selected frequ-ency regions.Digital Filtering
Magnitude response consideration. Four basic types of ideal filters with magnitude responses as shownbelowπ1ω0 ωc–ωcHLP(e jω)− π πω0 ωc–ωc1HHP (e jω)− ππ− πω11––ωc1 ωc1–ωc2 ωc2HBP (e jω)− π πω1–ωc1 ωc1–ωc2 ωc2HBS(e jω)
Depending on the form of the filter equation(a) Linear filters versus nonlinear filters.(b) Time-invariant filters versus time-varying filters.(c) Adaptive filters versus non-adaptive filters.(d) Recursive versus non-recursive filters. Depending on the structure of implementation(a) Direct-form, cascade-form, parallel-form and lattice structures.
A class of linear filters whose behavior does not change over time- Linearity implies that the filter meets the scaling and superposition properties. Two types1.FIR filter-Operate only on previous values of the input2.IIR filter-Operates on previous values of input & output both
A recursive filter has feedback fromoutput to input, and in generalits output is a function of the previousoutput samples and the present andpast input samples
A non recursive filter has no feedback from output to input, andin general its output is a function of the present and past inputsamples
Direct FormDirect Filter Structure
Cascade FormCascade Filter Structure
Parallel FormParallel Form Structure
DIGITALHigh AccuracyLinear Phase (FIR Filters)Flexible, Adaptive FilteringPossibleEasy to Simulate and DesignComputation Must be CompletedinSampling Period - Limits RealTime OperationRequires High PerformanceADC,DAC & DSPANALOGLess Accuracy–Component TolerancesNon-Linear PhaseAdaptive Filters DifficultDifficult to Simulate andDesignAnalog Filters Required at HighFrequencies and for Anti-Aliasing FiltersNo ADC, DAC, or DSP Required
Introduction to Speech Processing | Ricardo Gutierrez-Osuna | CSE@TAMU, chapter 10 of [Taylor, TTS synthesis, 2009]. An Introduction to Digital Filters,application note,january1999, Intersil and Design is a trademark of Intersil Corporation. |Copyright©Intersil Corporation 2000 Digital Filters and Z Transforms,Copyright © Richard C. Bailey and David M. Harrison, 1998, 1999 http://en.wikipedia.org/wiki/Digital_filter