This section summarizes digital filter theory in a rather terse fashion suitable for review study. linearity,time-invariance and four basic representations of digital filters are defined: the difference equation coefficients,impulse response, transfer function, and frequency response. Next the concepts of phase delay and group delay are defined. This material is a subset of that in .
where is the entire input signal, and is the output at time .
- Linearity and Time-Invariance
- Difference Equation
- Convolution Representation of LTI Filters
- Frequency Response
- Phase Delay and Group Delay