Multiplying sine wave with step function

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xRah
xRah 2020-11-5
回答： xRah 2020-11-5
Hi again!
I'm trying to produce a sampled data vector of a sine wave with the following parameters:
  • Amplitude 0.187
  • Signal Freq. 187Hz
  • Sampling rate 1600s^-1
I am running into an error and cannot figure out what the issue is with element wise multiplication of the step function and the sine wave. Code is as follows:
nn = -3:14; % index vector
uu = double(nn >= 0);% unit step
Ts = 1.6e-3;% sample time
Fs = 1600; % sample rate
t = linspace(-3, 14, Fs); % time
w = 2*pi*187; % omega
xx = 0.187*sin(w*t);% x(t) = 0.187sin(w*t)
xxuu = xx .* uu; % multiplying step function with sine wave
stem(t, xxuu)% stem plot
I am not entirely sure if this is the best way to go about this problem either. My code includes some hints I got from this site.

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采纳的回答

Ameer Hamza
Ameer Hamza 2020-11-5
编辑：Ameer Hamza 2020-11-5
I am not sure how you defined 'uu' vector. But the following code works fine
Ts = 1.6e-3;% sample time
Fs = 1600; % sample rate
t = linspace(-3, 14, Fs); % time
uu = 1*(t>=0);
w = 2*pi*187; % omega
xx = 0.187*sin(w*t);% x(t) = 0.187sin(w*t)
xxuu = xx .* uu; % multiplying step function with sine wave
stem(t, xxuu)% stem plot
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xRah
xRah 2020-11-5
oh and the index vector is supposed to be -3:14

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更多回答（3 个）

madhan ravi
madhan ravi 2020-11-5
uu = @(nn) +(nn >= 0);
xxuu = xx .* uu(t)
Paul
Paul 2020-11-5
Change one line to:
xxuu = xx .* (t >= tstep); % set tstep as the time when the unit step is applied
xRah
xRah 2020-11-5
Thank you all for your input and help :)

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