FIR filter and IIR filter

source:Industry News release time:2022-11-03 Hits: Popular:Infrared sensing module

　　 2109 PIR lens

　　1. The impulse response is of finite length: when the input digital signal is of finite length, the output digital signal is also of finite length.

　　2. It is easier to optimize than IIR filter.

　　3. Linear phase: cause h (n), which is even symmetric or odd symmetric with finite length.

　　4. It must be stable: all poles are in the unit circle after Z transformation.

　　IIR filter: easy to design and implement.

　　Disadvantages:

　　FIR filter: It is not easy to design a FIR filter than an IIR filter.

　　IIR filter:

　　1. The impulse response is infinite: when the input digital signal is finite, the output digital signal will become infinite.

　　2. It is more difficult to optimize than FIR filter.

　　3. Not necessarily stable: because all poles after Z transformation are not necessarily in the unit circle.

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