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|Authors: ||Settimi, A.*|
|Title: ||Fourier Domain Analysis performances of a RESPER probe|
|Other Titles: ||Amplitude and Phase inaccuracies due to the Round-Off noise of FFT processors|
|Issue Date: ||28-Sep-2010|
|Series/Report no.: ||Rapporti Tecnici INGV|
|Keywords: ||Fast Fourier Transform|
|Abstract: ||This report proposes to discuss the Fourier domain analysis performances of a RESPER probe. A uniform ADC, which is characterized by a sensible phase inaccuracy depending on frequency, is connected to a Fast Fourier Transform (FFT) processor, that is especially affected by a round-off amplitude noise linked to both the FFT register length and samples number. If the register length is equal to 32 bits, then the round-off noise is entirely negligible, else, once bits are reduced to 16, a technique of compensation must occur. In fact, oversampling can be employed within a short time window, reaching a compromise between the needs of limiting the phase inaccuracy due to ADC and not raising too much the number of averaged FFT values sufficient to bound the round-off.
Finally, the appendix presents an outline of somewhat lengthy demonstrations needed to calculate the amplitude and especially phase inaccuracies due to the round-off noise of FFT processors.|
|Appears in Collections:||05.01.01. Data processing|
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|Rapporti Tecnici INGV 159.pdf||Main Article||1.9 MB||Adobe PDF||View/Open
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