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APPENDIX 19
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Appendix 3 Reference
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f
(t)
Input signal
Time domain
Frequency domain
t
ω
F
(
ω
)
0
Fmax
Sampling
function
Fs > 2 Fmax
t
Fs > 2 Fmax
t
Fs > 2 Fmax
Sampling
function
Fs < 2 Fmax
t
Fs < 2 Fmax
t
Fs < 2 Fmax
Overlapped parts seem folded back
Fs/2
Section
observed on
screen
Anti-aliasing filter
In FFT processing, when the frequency bandwidth of the input signal is
unlimited, frequency spectrum components that do not exist will appear, due
to aliasing. To prevent this, a low-pass filter is required which cuts off the
input waveform at 1/2 of the sampling frequency. Such a low-pass filter is
called an anti-aliasing filter.
The input module incorporates an anti- aliasing filter and therefore allows
the 8855 to perform FFT analysis without being subject to aliasing.
Содержание MEMORY HiCORDER 8855
Страница 2: ......
Страница 20: ...xii Chapter Summary...
Страница 21: ...1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 A Chapter 1 Product Overview...
Страница 28: ...8 1 2 Identification of Controls and Indicators...
Страница 113: ...93 4 8 FFT Analysis Function Stored waveform 1 1 octave analysis 1 3 octave analysis Example Octave analysis waveforms...
Страница 116: ...96 4 8 FFT Analysis Function...
Страница 117: ...97 1 2 3 4 5 6 7 8 9 10 11 12 13 14 A Chapter 5 Input Channel Settings...
Страница 177: ...157 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Chapter 8 Search Function...
Страница 186: ...166 8 6 Moving Cursors to the Search Points...
Страница 205: ...185 10 5 Example of Printer Output Printing the List MEM Example...
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