A = 1; % amplitude of sine wave sine_wave = A*sin(2*pi*f*t); % generate sine wave % Add noise to sine wave SNR = 25; % signal-to-noise ratio noise_power = (norm(sine_wave)^2)/(length(sine_wave)*10^(SNR/10)); noise = sqrt(noise_power)*randn(size(sine_wave)); noisy...
% Create Noise Signal and embed sine wave in it at a random location npts=5000; % # points in signal srate=1000; % sample rate (Hz) dur=npts/srate; % signal duration in sec amp_n=3; % noise amplitude amp_t=1; % sine wave amplitude freq=100; % sine wave frequency sinepts=400...
YfreqDomain = fft(y); %take the fft of our sin wave, y(t) stem(abs(YfreqDomain)); %use abs command to get the magnitude %similary, we would use angle command to get the phase plot! %we'll discuss phase in another post though! xlabel('Sample Number') ylabel('Amplitude') title(...
YfreqDomain = fft(y); %take the fft of our sin wave, y(t) stem(abs(YfreqDomain)); %use abs command to get the magnitude %similary, we would use angle command to get the phase plot! %we‘ll discuss phase in another post though! xlabel(’Sample Number‘) ylabel(’Amplitude‘) ti...
[0:binwidth:srate-binwidth];% frequency scale goes from 0 to sample rate.Since we are counting from zero, we subtract off one binwidth to get the correct number of pointsplot(f,sfft_mag_scaled);% plot fft with frequency axisxlabel('Frequency (Hz)');% label x-axisylabel('Amplitude'...
%remember to take the abs of YfreqDomain to get the magnitude! stem(frequencyRange,abs(YfreqDomain)); xlabel(’Freq (Hz)‘) ylabel(’Amplitude‘) title(’Using the centeredFFT function‘) grid axis([-6,6,0,1.5]) 效果如下: 这张图就满足了我们的需求,我们得到了在+4和-4处的峰值,而且...
Simulink Editor 中。您的模型中将出现 Sine Wave 模块的副本,还有一个文本框用于输入 Amplitude 参数的...
YfreqDomain=fft(y);%takethefftofoursinwave,y(t) 4 5 stem(abs(YfreqDomain)); %useabscommandtogetthemagnitude 6 %similary,wewoulduseanglecommandtogetthephaseplot! 7 %we'lldiscussphaseinanotherpostthough! 8 9 xlabel('SampleNumber') 10 ylabel('Amplitude') 11 title('UsingtheMatlabfftcommand...
y-coordinate需要依赖于x-coordinate: e、 g.:频率5(5波) frequency = 5amplitude = 50overallY = 300while True: # [...] no_pts = window.get_width() for i in range(no_pts): x = i/no_pts * 2 * math.pi y = (amplitude * math.cos(x * frequency)) + overallY if i > 0: ...
- 200 Hz") ax.plot(time,sinewave1) ax.set_xlabel("Time(s)") ax.set_ylabel("Amplitude")...