How to prove this convolution problem?

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SUMMARY

The discussion centers on proving the convolution of the sinc function, specifically that sinc(t) * sinc(t) = sinc(t). The user initially approached the problem by converting it to the frequency domain, utilizing the property that the product of two rect functions in frequency space results in a rect function, which corresponds to the sinc function in the time domain. However, they seek an alternative method to prove this without relying on frequency domain transformations, particularly focusing on evaluating the integral of the convolution directly.

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  • Understanding of convolution in signal processing
  • Familiarity with the sinc function and its properties
  • Knowledge of Fourier transforms and frequency domain analysis
  • Basic calculus, particularly integration techniques
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Homework Statement


How do I prove that sinc(t) * sinc(t) = sinc(t)?


Homework Equations





The Attempt at a Solution


I converted it to frequency domain and got that rect(f) rect (f) = rect (f) which then converts back to sinc (t). But I'm just curious as how would I go about doing this if I don't convert to frequency domain? I get

[itex]\int ^{\infty} _{-\infty} sinc(\tau) sinc( t- \tau) dt[/itex]

I get stuck at this integral. Any help would be very much appreciated!
 
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