EASE 4.3 User’s Guide & Tutorial
View Calculations Window
The Frequency tab display is showing us the Direct SPL values for all frequencies at the location shown.
Note the four color bars to the right of the graph. The top three allow you to look at the Average, Minimum and Maximum SPL levels for the area scanned. The bottom one allows you to turn off the red SPL curve for the individual location. The result of turning Average, Minimum and Maximum On is shown below.
Note that moving the cursor to any point on one of the curves will produce a readout in the Cursor field at the bottom of the window giving you the frequency and Direct SPL level at that point.
The View section in the lower left of the window allows you to change the display window from a graph to a tabular listing of the same information or to a side by side display of both. Try it out.
The Send Picture To button is a quick way to save the chart/graph to the Clipboard as an electronic file or to send it to the EASE Page Designer. The Send Values button saves the single values to the Clipboard for further post processing.
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The File Info tab contains a statistical summary of the setup parameters, including the loudspeakers used, their locations and output levels in an ASCII text format that can be saved and opened in other programs and then printed.
The Echogram tab is empty at this time and will be until an Echogram is created. Echograms are a feature available only to AURA users. We'll cover them later in the AURA section of this manual.
The Distribution tab opens the distribution window which displays a bar graph representation of the selected parameter, Direct SPL at 1000 Hz in the example shown below. As you can see, it enables you to quickly determine what percentage of the mapped areas fall within certain criteria. In this example, 90 % of the total area falls within 94 to 98 dB (plus or minus 2 dB) .
This window is your answer to the specifications that call for coverage to be "flat within +/-__dB". Use the Cursor and Cursor value readout below the bar graph to obtain exact readings.
If you find it hard to read the exact figures from the graph, click on Table to open the Distribution Table which gives you exact figures.
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Now, lets take a closer look at the top Tool Bar portion of the View Calculation window.
The large button on the left (the + button in the above graphic) opens and closes the bottom Evaluation Display portion of the window. It allows you to close the bottom portion of the window, so you can see the Map.
The Open Folder icon is used to open previously created .emp Mapping files for review. The Floppy Disk icon button next to it is used to save the current simulation as a .emp Map file. The Notepad icon is used to save the current file in an ASCII .txt format. The Waste Basket icon is used to delete the current simulation file from the View Calculation module and choose another one from the File Listing drop down menu.
The left colorful Map icon is used to draw a new Map. Lets try it out. Open the drop down menu directly below the Redraw button and select a new simulation type. Note that you have a wide variety to choose from. Selecting one, STI for example, and then pressing the Redraw button will quickly produce an STI map in place of the Direct SPL map. Since we used All Mapping, the program doesn't have to rerun the entire simulation. All it has to do is scan the data it collected and render the drawing, a process that takes only a few seconds.
The right colorful Map icon allows the selection of all simulations and all frequencies and frequency resolutions. Pressing the icon, opens a drop down menu giving you the choice of Render All or Send to EASEPaD. Render All will render all the Maps selected and Send To EASEPaD will both render the Maps and send them to EASEPaD for further processing.
Selecting one of the two choices will open the selection menu shown below. The buttons and the selection fields make it easy for you to select the specific Maps you want to see or save. Try it out. You'll find it a very useful tool for putting together presentations.
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The Frequency drop down menu allows you to quickly select the center point of the frequency band that will be used in the next simulation while the Bandwidth drop down menu determines the width of the frequency band.
Note that you have a choice of Third Octave, One Octave, Three Octaves, Broadband and a number of specific frequencies. One Octave will average the results over one octave, while Broadband will show the results averaged across the entire spectrum. Custom bandwidths can be generated using the Frequency menu to set the lower frequency limit and the numerical frequency listings to set the upper limit, 1000 Hz plus to 5000 Hz for example.
The wider the bandwidth, the less apparent the effects of comb filtering. As a general rule, simulations run with a 3 octave bandwidth come closest to simulating the variations you will hear while "walking" the room during the final commissioning.
The location section of the tool bars shown below identifies the location of the graph shown in the display section of the window and allows you to change the location.
In this case we are looking at the 1st point in Audience Area A2. The location coordinates follow. The l<, <, < < and >>, >, >l buttons allow you to move backwards and forwards through the points scanned. The number field allows you to choose the size of the step.
The Walker, when activated, displays the actual location.
The Weight drop down arrow allows you to select between “unweighted” frequency curves and A-Weighted curves. See below.
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