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Unformatted text preview: UCSB Fall 2007 ECE 130A: Formulas for Final Examination INSTRUCTIONS: The exam is closed book, closed notes. In addition to two sides of handwrittend notes, this is the only material you are allowed to consult. Sinc function: sinc( x ) = braceleftBigg sin x x x negationslash = 0 1 x = 0 Eulers Identity e j = cos + j sin This implies that cos = e j + e j 2 , sin = e j e j 2 j Convolution: ( x 1 x 2 )( t ) = integraltext x 1 ( ) x 2 ( t ) d (for aperiodic signals x 1 and x 2 ). FOURIER SERIES For a periodic waveform x ( t ) with fundamental period T and fundamental frequency , the Fourier series coefficients { a k } satisfy x ( t ) = summationdisplay k = a k e jk t where a k = 1 T integraldisplay T x ( t ) e jk t dt Fourier Series Example: For x ( t ) = k = ( t kT ), we have a k = 1 T for all k . Fourier Series Properties: In the following table, assume that both x ( t ) and y ( t ) have fundamental period T ....
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 Fall '07
 MADHOW

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