What are the advantages of FIR filters over IIR filters?Body Movement Sensor Processor

　　* Filters with linear phase can be easily designed. Linear phase filters delay the input signal without distorting its phase.

　　* Simple to implement. In most DSP processors, only one instruction is required to accumulate a loop to complete the FIR calculation.

　　* Suitable for multiple sampling rate conversion, it includes decimate (decrease sampling rate), interpolation (increase sampling rate) operations. Whether it is extraction or interpolation, the use of FIR filter can save some calculation, improve the computational efficiency. In contrast, if an IIR filter is used, each output is computed one by one and cannot be omitted, even if the output is discarded.

　　* With desirable digital characteristics. In practice, all DSP filters must be implemented with finite precision (a finite number of bits), and the use of finite precision in IIR filters can cause great problems. Since the feedback circuit is used, IIR is usually implemented with very few bits, so the designer can solve fewer problems related to non-ideal arithmetic.

　　* can be implemented with decimals. Unlike IIR filters, FIR filters may usually be implemented with coefficients less than one. (If desired, the total gain of the FIR filter can be adjusted at the output). This is also a consideration when using fixed-point DSPS, which can make the implementation much simpler.

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