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Unformatted text preview: to a receiver at the listening end. The receiver (not shown) sequentially undoes all the filtering steps done at the transmitter. The diagram below represents only the transmitter filtering operations. Highpass Filter Lowpass Filter H 1 ( ) H 2 ( ) 1 1 x ( t ) a ( t ) b ( t ) c ( t ) y ( t )-20 0 20 -15 0 15 cos(20 t ) cos(30 t )-2-1 1 2 3 4 (a) Sketch ) ( A . Show all amplitudes and frequencies. Label all axes. (b) Sketch B ( ) and label the axes. (c) Sketch C ( ) and label all important points. (d) Sketch D ( ) and label all important points. Assume X ( ) 1...
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- Spring '07