필터 설계 및 분석

Design lowpass FIR filters. You can extend many of the concepts presented here to other responses such as highpass, bandpass, and others.

Design FIR halfband filters. Halfband filters are widely used in multirate signal processing applications when you interpolate or decimate by a factor of two. In many cases, you can implement halfband filters efficiently in a polyphase form because nearly half of the halfband filter coefficients are equal to zero.

Design efficient FIR filters with very narrow transition-bands using multistage techniques. The techniques can be extended to the design of multirate filters. See Multistage Rate Conversion for an example of that.

Design complex bandpass filters. Complex bandpass filters are used in many applications from IF subsampling digital down converters to vestigial sideband modulation schemes for analog and digital television broadcast. One easy way to design a complex bandpass filter is to start with a lowpass prototype and apply a complex shift frequency transformation. This example reviewes lowpass prototypes from single-stage single-rate FIR filters to multistage multirate FIR filters to IIR filters.

Design an implementation of fractional delay FIR filters.

Effect of time delay and scaling in multirate filters. Use outputDelay function to calculate the time delay and scaling.