Fourier Transform of x(t) and g(t) with Product Calculation

In summary, the task is to find the Fourier transform of x(t) = 5cos(2*pi*1000*t) and g(t) = ∑ from n=-infinity to infinity delta(t-n/10000), as well as the product of the two functions. The answer for x(t) is 5*sqrt(pi/2) [delta(w-2000pi)+delta(w+2000pi)], while the Fourier transform of g(t) is a train of delta functions. The product of the two functions is not simply x(w), as g(w) is not equal to 1, but rather a train of delta functions.
  • #1
nikki92
40
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Homework Statement


x(t) = 5cos(2*pi*1000*t) and g(t) = ∑ from n=-infinity to infinity delta(t-n/10000)

find Fourier transform of x(t) and g(t) and the product of the two


The Attempt at a Solution



x(w) = 5*sqrt(pi/2) [delta(w-2000pi)+delta(w+2000pi)]

g(w) = 1

so would the product of the two just be the x(w) ?
 
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  • #2
nikki92 said:

Homework Statement


x(t) = 5cos(2*pi*1000*t) and g(t) = ∑ from n=-infinity to infinity delta(t-n/10000)

find Fourier transform of x(t) and g(t) and the product of the two


The Attempt at a Solution



x(w) = 5*sqrt(pi/2) [delta(w-2000pi)+delta(w+2000pi)]

g(w) = 1

so would the product of the two just be the x(w) ?
##G(\omega)## isn't equal to 1. That's the Fourier transform of a single delta function. You have a train of delta functions.
 

1. What is Fourier transformation?

Fourier transformation is a mathematical technique used to decompose a complex signal into its individual frequency components. It is used in signal processing, image processing, and various other fields of science and engineering.

2. How does Fourier transformation work?

Fourier transformation works by breaking down a signal into a sum of sine and cosine waves of different frequencies and amplitudes. This allows for the analysis and manipulation of the individual frequency components of a signal.

3. What is the difference between Fourier transformation and Fourier series?

Fourier transformation is used for continuous signals, while Fourier series is used for periodic signals. Fourier transformation converts a signal from the time domain to the frequency domain, while Fourier series decomposes a signal into a series of sine and cosine waves with different frequencies and amplitudes.

4. Why is Fourier transformation important?

Fourier transformation is important because it allows for the analysis and processing of signals in the frequency domain, which can provide insights and solutions that are not easily visible in the time domain. It is also a fundamental tool in many areas of science and engineering, including image processing, data compression, and digital signal processing.

5. What are some applications of Fourier transformation?

Fourier transformation has a wide range of applications in various fields, including audio and video compression, image processing, speech recognition, and medical imaging. It is also used in solving differential equations, pattern recognition, and filtering in signal processing.

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