how the fourier transfom actually used in elactronics

Discussion in 'General Electronics Chat' started by vead, Dec 11, 2013.

  1. vead

    Thread Starter Active Member

    Nov 24, 2011
    621
    8
    I am having problem to understand Fourier transform in practical way
    I have done some work to understand Fourier transform
    in communication signal can be represent in term of time and frequency

    Time domain- curve of amplitude over time axis
    example
    I have 5volt amplitude signal that start with t=-1 and end with t=1
    function f(x)= x limit -t to +t
    f(x)=5 -1 to +1

    frequency domain- curve of amplitude over frequency axis
    I have 5volt amplitude signal that start with f=-3 hz and end with =3hz
    function f(x)= x limit -fz to + fz
    f(x)=5 -3 to +3

    transform - convert one domain to another domain with no loss of information
    frequency domain<> timedomain

    can anyone tell me how to use fourier transform in practical way
     
  2. blah2222

    Well-Known Member

    May 3, 2010
    554
    33
    It can be very useful when you begin to look at system design, more specifically filter design. The ability to create systems that selectively pass certain signals at certain frequencies while they block signals at other frequencies.

    The Fourier Transform is a tool that can be used to display useful frequency information of signals and frequency properties of systems.

    The time domain of signals makes it very difficult to pick out frequency information, especially when there are multiple frequencies involved and at different amplitudes.
     
  3. ramancini8

    Member

    Jul 18, 2012
    442
    118
    When you want to amplify a complex waveform you need to know the highest frequency component (and its amplitude) to insure selection of an amplifier with the correct BW. The fourier transform does this for you.
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,011
    3,233
    The Fourier transform can be used whenever you want to know the frequency content of an arbitrary signal which is important if you want to process the signal. The Fast Fourier Transform (FFT) is commonly used by oscilloscopes and computers for this purpose.
     
  5. vead

    Thread Starter Active Member

    Nov 24, 2011
    621
    8
    thanks
    Time domain- curve of amplitude over time axis
    example
    I have 5volt amplitude signal that start with t=-1 and end with t=1
    function f(x)= x limit -t to +t
    f(x)=5 -1 to +1

    frequency domain- curve of amplitude over frequency axis
    I have 5volt amplitude signal that start with f=-3 hz and end with =3hz
    function f(x)= x limit -fz to + fz
    f(x)=5 -3 to +3
    please anyone tell me the relation between function , time limit,frequency limit, sin
    why these used in signal analyses
     
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