FIR filter design (1) -- using the FDATool toolbox of MATLAB to design FIR filter parameters

With 99 rank FIR Take low-pass filter as an example , Learn to use matlab Of fdatool Toolbox design filter , And the filter coefficients are derived to .coe file , union Vivado Conduct FPGA Of FIR filter Design .

The filter parameters in this paper are ： Lowpass FIR filter , Window function design , Blackman window ,99 rank , Sampling frequency 32MHz, Passband frequency 1.5MHz, The cut-off frequency does not need to be set when applying the window function , Determine the cut-off frequency according to the selected window function and order .

1.  open matlab

Command line input fdatool, enter , open fdatool Filter design toolbox

The initial interface after opening is as follows ：

1 Filter type selected at （ Lowpass 、 qualcomm 、 Bandpass 、 Band stop ）;

2 Select to design at IIR（ Infinite impulse response ） Filter or FIR（ Finite shock response ） filter , And choose which method to use to design the corresponding filter ;

3 The order of the design filter at , Generally, the higher the order, the better the filtering effect , But the coefficients correspond to more , stay FPGA Hardware implementation will occupy more resources , When designing, we should consider comprehensively ;

4 Sampling frequency of the design filter at Fs, Passband frequency Fpass And cutoff frequency Fstop࿱