Specifications

EAW Smaart 6 Operation Manual Analysis Modes and Display Types
43
Spectrum Mode FFT Parameters
The FFT parameters for Spectrum, Frequency Response, and Impulse Response are in
their respective tabs in the Options dialog.
Sample Rate – Each time Smaart 6 starts or a new input device is selected, the computer’s
sound hardware is queried to determine which sampling rates are supported. These
options appear in Sampling Rate drop-list in the Audio I/O tab of the Options dialog.
Note that the Sampling Rate set here appears at the top of the other tabs but can be set
only in the Audio I/O tab.
FFT Size – The FFT Size is set independently for Spectrum and Frequency Response
measurements in their respective tabs in the Options dialog. See Options Menu on page
93 to determine their specific options.
Time Constant – The time constant (TC), or time window of an FFT is a function of
the FFT size and sampling rate (TC = FFT size/SR). Smaart 6 automatically calculates
the time constant yielded by the FFT size and SR and displays it in the Time Constant
field in the Impulse/Locator tab of the Options dialog (it is not editable).
Frequency Resolution – A function of the FFT size and sampling rate (FR = SR/FFT
size in samples), frequency resolution is an important factor that determines the detail
obtained from FFT-based measurements, particularly at low frequencies. See Frequency
Resolution on page 26 for more information. Note that the Frequency Resolution for
Spectrum and Frequency response measurements is displayed on the Status bar along
the bottom of the main real-time window.