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A comment on Fourier Transform existed, but I never had intuitive understanding until now.

Re:Fourier Transform existed, but I never had intuitive unde... by userbinator on Wednesday April 19, 2023 @11:49PM (#35636158)
Multiplication is used because when a frequency is present and in phase (meaning peaks are aligned), it would result in more 'positive curves' sitting above the x-axis than negative curves below.

This is also the principle behind DSSS modulation ( https://en.wikipedia.org/wiki/Direct-sequence_spread_spectru... ), which is used in numerous communications systems.

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Re:Fourier Transform existed, but I never had intuitive unde... by GianIsAlive on Tuesday April 25, 2023 @02:00PM (#35704255)
Thank you for sharing!
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