An alternative to using a Gaussian function for h(t) in the computation of the STFT, it is K cos² (πt/T) -T/2≤t≤T/2 0 otherwise proposed to use the function h(t) =< K>0 is adjusted for unit energy. One advantage of this function over the Gaussina function is that it is of finite (rather than infinite) duration. a) Show that in order to make h(t) have unit energy, K must be set to the value K = √√8/(37). As with other problems, this result cannot be reverse engineered. b) Using the modified definition of the Fourier Transform and taking advantage of symmetries in the function given, show 4T sinc(@T/2π) c) 3π (2π)²-(WT)² Let x(t) be the signal x(t)= e defined -∞0 and

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An alternative to using a Gaussian function for h(t) in the computation of the STFT, it is
K cos (at /T) -T/2<t<T/2
proposed to use the function h(t) =
where T>0 and
otherwise
K >0 is adjusted for unit energy. One advantage of this function over the Gaussina
function is that it is of finite (rather than infinite) duration. a) Show that in order to make
/8/(3T) . As with other
problems, this result cannot be reverse engineered. b) Using the modified definition of
the Fourier Transform and taking advantage of symmetries in the function given, show
h(t) have unit energy, K must be set to the value K = ,
%3D
4T sinc(@T / 2T)
c)
V 37 (27) -(@T)²
that H(j@) the Fourier Transform of h(t) is given by H(j@) =
%3D
Let x(t) be the signal x(t) = el defined -0 <1<∞ and let x,(7)=x(7)h(T-1) be a
signal for which the SFTF X,(j@) is sought. Write a mathematical expression for
|X,(j@) and use it to compute (@),.
Transcribed Image Text:An alternative to using a Gaussian function for h(t) in the computation of the STFT, it is K cos (at /T) -T/2<t<T/2 proposed to use the function h(t) = where T>0 and otherwise K >0 is adjusted for unit energy. One advantage of this function over the Gaussina function is that it is of finite (rather than infinite) duration. a) Show that in order to make /8/(3T) . As with other problems, this result cannot be reverse engineered. b) Using the modified definition of the Fourier Transform and taking advantage of symmetries in the function given, show h(t) have unit energy, K must be set to the value K = , %3D 4T sinc(@T / 2T) c) V 37 (27) -(@T)² that H(j@) the Fourier Transform of h(t) is given by H(j@) = %3D Let x(t) be the signal x(t) = el defined -0 <1<∞ and let x,(7)=x(7)h(T-1) be a signal for which the SFTF X,(j@) is sought. Write a mathematical expression for |X,(j@) and use it to compute (@),.
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