Full form related to Digital signal processing

DSP - Digital signal processing

ROC - Region of convergence

DT - Discrete time

FT - Fourier transform

DFT - Discrete Fourier transform

DTFT - Discrete time Fourier transform

IDFT - Inverse  discrete Fourier transform

FFT - Fast Fourier transform

BLT - Bi-linear transformation

LTI - Linear time invariant 

LCCDE - Linear constant coefficient difference equations
DIT - Decimation in time
TVP - Time variance property

PFE - Partial function expansion 

IIR - Infinite impulse response

FIR - Finite impulse response