- #1
Hepic
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Homework Statement
We are given that system of 1st grade
1/2 * dy(t)/dt + y(t) = x(t)
1) We need to find frequency response { H(w) }
2) We need to find circular frequency -3dB
3) We need to find the absolute value of H(w) in dB for frequency f = 3/π Hz
2. Homework Equations
(log is always with base 10)
Convertion to db => db = 20log(|H(w)|)
circular frequency = -3db => |H(w)|{w=-3db} = 1/sqrt(2) * H(w){max w}
Y(w) = H(w) * X(w)
The Attempt at a Solution
[/B] I solved the 1st one with that way.
(take Fourier) => 1/2* jw*Y(w) + Y(w) = X(w)
(divide with X(w)) => 1/2* j*w*H(w) + H(w) = 1 => H(w) = 1 / (1/2 * j*w + 1) => H(w) = 2 / (2 + jw)
For 2nd I don't know what is w = max, and for 3rd I did an attempt but I found wrong result.
My book gives as answer for 2nd the value = 2rad/sec, and for 3rd the value -20dB.
If anyone can help me with the procedure of solving I would be happy.
Thanks in advance !