_Signal_FAQ13_Shift_&_Expansion - As an example,...

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Is time expansion the same as dividing t and time shift the same as subtracting t ? There is no need and is in fact harmful to remember this type of things. The best or surest way is to look at or sketch the waveform. It is best that ones run away from this table-look-up mentality, where one tries to reduce everything to pattern matching from a table.
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Unformatted text preview: As an example, suppose a signal ( 29 t x is expanded by a factor of 2 and then delay by 3 sec. What is the resulting signal ( 29 t y ? Should it be -3 2 t x or -2 3 t x ? The point is that not everything can be converted into a table! If it can, I may as well just give everyone a table....
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This note was uploaded on 08/02/2009 for the course ECE EE2009 taught by Professor Prof.c.c.ko during the Fall '07 term at National University of Singapore.

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