Sony 7 manual Frequency minimum

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Smoothing window

Choose a setting from the Smoothing window drop-down list to determine the window function applied to the input data prior to analysis. This option influences the sharpness of peaks in an FFT graph and the leakage into neighboring frequencies.

•Choose Rectangle to apply no window. This results in a very sharp peak, but high leakage.

•Choose Triangular (also referred to as a Bartlett or Parzen window) to apply a window that results in less leakage than the rectangle window.

•Hamming, Hanning, and Blackman windows are commonly used in audio applications.

•Choose Blackman-Harristo obtain the least sideband leakage of the six options. The major drawback of Blackman-Harris is rounded graph peaks.

Slices displayed

The Slices displayed value determines the number of FFT slices created for the selection. When displaying multiple slices in the spectrum graph, slices are displayed chronologically forward or backward based on whether you have the Forward or Backward radio button selected.

Set sonogram resolution

The Set sonogram resolution value determines the number of FFT samplings used in a sonogram. This keeps the processing time and graph resolution constant. Increasing this value increases the horizontal graph resolution, but requires more processing time.

When this check box is cleared, the resolution value is determined by the length of the selection and the FFT overlap value.

Display range

Note: These options are available in Normal display only.

Select the Both, Left, or Right radio button to choose which graph you want to edit.

If you are analyzing a stereo file, select the Sync Graphs check box to synchronize both displays in a stereo file so you can view the same region of the FFT in both channels.

Select the Logarithmic graphing check box to display the X-axis in logarithmic mode instead of linear mode. This results in more graph area being devoted to lower frequencies.

Frequency minimum

Determines the lowest frequency displayed in a graph when you select Zoom to Range.

Frequency maximum

Determines the highest frequency displayed in a graph when you select Zoom to Range.

Ceiling

Determines the highest amplitude level displayed in a graph when you select Zoom to Range.

Floor

Determines the lowest amplitude level displayed in a graph when you select Zoom to Range.

Hold peaks during monitoring

Selecting this check box results in the highest value of each frequency being indicated on the spectrum graph with a small horizontal line. The length of time (in seconds) that the peak is held is determined by the value entered in the edit box.

USING SPECTRUM ANALYSIS CHP. 17