Chapter: Digital Signal Processing - IIR Filter Design

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Difference Between Analog Filter and Digital Filter

Analog filters are used for filtering analog signals. Digital filters are used for filtering digital sequences.

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).

 


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