Introduction to digital signal processing: Discrete time signals and sequences,conversion of continuos to discrete signals,Linear shift invariant systems,Stability and Causality,Linear differential equation to difference equation ,Linear Constant Coefficient Difference Equations, Frequency domain representation of discrete time sinals and systems . Realisation of digital Filters : Applications of Z transforms,Solution of difference equations of digital filters ,System function,Stability criterion,Frequency Response of stable systems,Realisation of digital filters - direct,canonic,cascade and parallel forms.