DIFFERENCE BETWEEN ANALOG FILTER AND DIGITAL FILTER
Analog Filter
1 Analog filters are used for filtering analog signals.
2 Analog filters are designed with various components like resistor, inductor and capacitor
3 Analog filters less accurate & because of component tolerance of active components & more sensitive to environmental changes.
4 Less flexible
5 Filter representation is in terms of system components.
6 An analog filter can only be changed by redesigning the filter circuit.
Digital Filter
1 Digital filters are used for filtering digital sequences.
2 Digital Filters are designed with digital hardware like FF, counters shift registers, ALU and software s like C or assembly language.
3 Digital filters are less sensitive to the environmental changes, noise and disturbances. Thus periodic calibration can be avoided. Also they are extremely stable.
4 These are most flexible as software programs & control programs can be easily modified. Several input signals can be filtered by one digital filter.
5 Digital filters are represented by the difference equation.
6 A digital filter is programmable, i.e. its operation is determined by a program stored in the processor's memory. This means the digital filter can easily be changed without affecting the circuitry (hardware).
