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