Īccording to the picture below, The filter coefficients are derived : and 、 Filter coefficient generationĬlick the position in the red box below to configure the filter accuracy, Here, select fixed point number and full precision, The seat width is 16 position. More intuitive, You can select the frequency as the unit, Here is the sampling frequency fs=5.882MHz, The specific configuration is as follows, The cut-off frequency of the passband is 100KHz, Stopband cut-off frequency is 1MHz, The effect is the same as the normalized frequency. Be careful : The tap coefficient of the filter = The order of the filter +1.Ĭonfigure the filter passband and stopband cut-off frequency and attenuation amplitude in the red box in the figure below, Here, the normalized frequency is selected as the unit, We know the frequency of adoption fs Corresponding 2pi,fs/2 Corresponding pi, stay filter designer Special attention needs to be paid in : Here is according to fs/2(pi) To normalize, namely fs/2 Corresponding to 1. Ĭonfigure the filter order in the red box in the figure below, It can be configured or selected independently Minimum order The tool automatically determines the required minimum filter order, The following density factor is the design parameter in equiripple, Configure according to the default value. , In the school digital signal processing course, In general, I will focus on the window function method, But in practical engineering, Compared with the window function method, the expected frequency response is achieved, More orders are required, And the ripple gain of passband and suppression band in practical application is not considered, And the equal ripple design method is very applicable. Select the design method of the filter in the red box below, The most commonly used method is the window function method (windows)、 Equal ripple design method (Equiripple) And the least square method (Least-squrares) etc. ![]() Select the filter type in the red box below, Mainly including low-pass 、 rrc 、 qualcomm 、 Bandpass 、 Band stop 、 Differentiator 、 Multiband 、Hilbert converter 、 Any amplitude, etc, Here take the low-pass filter as an example, choice Lowpass, stay Lowpass There will be Raised-cosine Raised cosine filter, Used for channel shaping filtering, also halfband-lowpass Half band filtering, It is used for signal oversampling processing during up and down frequency conversion ( Extraction and interpolation of signals ). In the command window “filter designer” Call the tool, You can click the red box in the following figure to enter the main interface. ![]() In the previous article, We introduced Filter Solutions This filter tool, The feature of this tool is that it can generate analog circuits and C Code, This article will briefly introduce matlab Medium filter designer How to use the filter tool, This tool is more comprehensive. ![]() and 、 Filter coefficient generationĪdopt matlab filter designer A brief summary of the generation filter method One 、 summary adopt matlab filter designer A brief summary of the generation filter method.Adopt matlab filter designer A brief summary of the generation filter method
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