EAW Resolution Spezifikationen PDF herunterladen (Seite 55)

EAW Smaart 6 Operation Manual Analysis Modes and Display Types

The first large peak on the impulse response or ETC trace is usually the highest in

magnitude and corresponds to the initial arrival time of energy in the impulse response

measurement. The time from the beginning of the measurement to this peak provides

the total propagation delay time (electrical and acoustic) through the SUT.

Smaart 6’s Locked Cursor is automatically set to the highest peak after a measurement

completes, with its location indicated in the cursor readout above the plot. When the

Locked Cursor is present, pressing Shift + Space Bar enters the Locked Cursor time

location as the current Delay Time for the Internal Signal Delay. To display or move

the Locked Cursor, Cmd/Ctrl + Click on the desired time location or use the Find Peak

(Shift + P) function to reset it to the trace’s highest peak.

Note that when the Locked Cursor is present and the mouse cursor is positioned over

the plot, the Cursor Readout provides the time and amplitude coordinates for both cursors

and automatically calculates the relative difference between them. This feature provides

a convenient method of finding time and amplitude differences between the Locked

Cursor position and any other point on the impulse response plot.

Another way of finding the relative difference between two points on a Log/ETC plot

is to click and drag the mouse cursor over the plot, drawing a rubber band. When you

then release the mouse button, the relative time and magnitude difference between the

end points of the line, along with the slope (in dB/s) and the equivalent decay time (T)

for 60 dB of decay (also called T

or RT

) are displayed in the upper right corner of

the plot. Clicking once on the plot clears the line and other information.

Smaart 6’s Impulse Response measurements are stored as Windows .wav or Mac AIFF

files. Click the Save As button to save the impulse response measurement to a file.

3.3.3 Automatic Delay Locator

Smaart 6’s automatic delay locator finds the time offset (delay) between two input

signals by measuring the impulse response of the SUT. This measurement can be

performed interactively in Impulse mode or automatically in Spectrum or Frequency

Response measurements. The a delay measurement requires both reference and

measurement signals.

The Delay Auto-Locator is activated by clicking the Auto Sm (Delay Auto-Locate

Small) or Auto Lg (Delay Auto-Locate Large) buttons below the Delay readout (lower

right of the main window). The small and large options refer to the time window used

in the measurement routine. Two options are offered because Smaart’s technique to

find delay times is very sensitive to the SUT’s decay time. The minimum time window

for delay measurements must be significantly longer than the longest delay time you

expect to measure. For best results, particularly when measuring low-frequency devices,

the window should exceed the SUT’s entire reverberant decay time (in this case, the

SUT includes the room).

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