Cirrus-logic CDB5490U Manual do Utilizador descarregar pdf (Página 33)

CDB5490U

DS923DB5 33

2.8.1.12 Frequency Domain Information

The following describe the indicators associated with FFT (Fast-Fourier Transform) analysis. FFT data

can be plotted in the Data Collection window by setting the analysis type selector to FFT (see Figure 27).

The FFT information includes:

• FREQUENCY: Displays the x-axis value of the cursor on the FFT display.

• MAGNITUDE: Displays the y-axis value of the cursor on the FFT display.

• S/PN: Indicates the signal-to-peak noise ratio (decibels).

• SINAD: Indicates the signal-plus-noise-plus-distortion to noise-plus-distortion ratio (decibels).

• S/D: Indicates the signal-to-distortion ratio, 4 harmonics are used in the calculations (decibels).

• SNR: Indicates the signal-to-noise ratio, first 4 harmonics are not included (decibels).

• FS-PdB: Indicates the full-scale to signal Ratio (decibels).

Figure 27. FFT Analysis

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