设计了一个3dB，截止频率4bpm的高通滤波器
报错：出错 gaotong (line 23)
b = firpm(N, Fo, Ao, W, {dens});
版本是2017b
function Hd = gaotong
%GAOTONG Returns a discrete-time filter object.
% MATLAB Code
% Generated by MATLAB(R) 9.3 and Signal Processing Toolbox 7.5.
% Generated on: 09-Feb-2023 13:12:43
% Equiripple FIR Lowpass filter designed using the FIRPM function.
% All frequency values are in Hz.
Fs = 10; % Sampling Frequency
Fpass = 3; % Passband Frequency
Fstop = 0.6; % Stopband Frequency
Dpass = 0.057501127785; % Passband Ripple
Dstop = 0.0001; % Stopband Attenuation
dens = 16; % Density Factor
% Calculate the order from the parameters using FIRPMORD.
[N, Fo, Ao, W] = firpmord([Fpass, Fstop]/(Fs/2), [1 0], [Dpass, Dstop]);
% Calculate the coefficients using the FIRPM function.
b = firpm(N, Fo, Ao, W, {dens});
Hd = dfilt.dffir(b);
% [EOF]
