Bose Modeler Software Tutorial - Chapter 10 - Listeners

Bose Professional Systems

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• Publié par: Fiwyong
• Nombre de lectures: 51
• Langue: English

Extrait

Bose ® Modeler ® Software User Guide

Chapter 10: Listeners Modeler software provides the ability to simulate listeners in your model. Listener locations in a model provide precise reference points from which to analyze acoustic predictions. As you change the sound system design, listener locations make it easy for you to choose a consistent point of comparison for acoustic prediction data. This chapter covers placing listeners, viewing listener data, and how listener locations are used to predict sound.

Listeners and audience It is important to note the difference between listeners, and surfaces occupied by an audience. Listeners are objects that are placed within the model at precise locations. They provide points of reference when using the Sample tool to view acoustic predictions for different areas in the model. Audience refers to the acoustic characteristics of a particular surface in the model. Surfaces in Modeler software can be designated as occupied by an audience. When you designate a surface as occupied by an audience, Modeler software will simulate the effect that an audience has on the acoustics in the room. In summary:  Listeners - placed in a model as a reference location for generating acoustic predictions  Audience - a surface attribute that causes Modeler software to simulate the presence of an audience

 

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Placing listeners Follow these steps to place a listener location in your model: 1. Select the Place Listener tool in the Draw toolbar

Figure 10.1 -Place Listener tool

Note: Listener locations can be added to Floor and Seating surfaces.

2. Click at the desired location in your model to place a listener. The number in the green box is the listener identifier. The arrow indicates the direction in which the listener is facing (the yaw). By default, the listener faces in the positive X direction.

Figure 10.2 - A listener location 3. Adjust the direction the listener is facing by dragging the blue yaw arrow in the listener circle. Click near the tip of the arrow and drag it around the circle. The listener should face in the direction that a listener would face in the venue.

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Figure 10.3 - Adjust the yaw of a listener 4. Move the listener location by clicking and dragging the icon in the center of the circle.

Copy and paste listeners Listener locations can be copied and pasted between different models. To do this, select the listeners you would like to copy and choose Edit > Copy (or press Ctrl + C ). Open or create the model that you would like to add these listener locations to, and select Edit > Paste (or press Ctrl + V ). The listener locations are added to the model, and appear in the same location relative to the origin.

Note: Listener locations that are copied and pasted will have the same X and Y coordinates relative to the origin in both the original and new models. This feature is most useful when copying and pasting between two models with similar geometry and layout.

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Overlapping surfaces It may be helpful to place listeners in acoustically challenging locations, such as underneath a balcony. If you try to place a listener on a surface that overlaps another surface, Modeler software will prompt you to choose which surface you would like the listener placed on. For example, the theatre in Figure 10.4 has an orchestra seating area ( Seating1 ) and a balcony seating area ( Seating2 ).

Figure 10.4 - A theatre with two overlapping seating areas When you place a listener on an overlapping surface, Modeler software will prompt you to choose which surface the listener is sitting on, as shown in Figure 10.5.

Figure 10.5 - Placing a listener on two overlapping surfaces Choose the desired surface type to place the listener location.

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Setting listener preferences Follow these steps to change how listeners are displayed in Modeler software: 1. Open the Preferences dialog box by choosing Edit > Preferences , or by pressing Ctrl + R . Switch to the View tab.

Figure 10.6 - Listener viewing options in the Preferences dialog box 2. To hide the wireframe representation of the listener, remove the check mark from the Wireframes box. 3. To hide the listener identifier number, remove the check mark from the Identifiers box.

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Ident.

Listener properties You can view and modify characteristics of the listeners in your model using the Listeners tab:     

Figure 10.7 -Listeners tab See the table below for information on each column in the Listeners tab.

X Y Ear Height

Yaw

The listener identifier number is generated automatically when you place a listener. After you place a new listener, or copy and paste a listener, you can change this number using the Listeners tab. The distance of the listener location from the origin along the X Axis. The distance of the listener location from the origin along the Y Axis. The height above the surface of a listeners ears. This number should be chosen based on whether the listeners are sitting or standing. The default value is 1.0 m (3.3 ft) above the ground. Ear height must be between 0 and 2.13 m (7 ft). The direction that the listener is facing. The default position is 0º (positive X direction).

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Notes

Surface Type

Bose ® Modeler ® Software User Guide

A text field that can be used for notes about the listener location. For example, you may want to note specific acoustic prediction characteristics for a given listener location. The identifier number of the surface that the listener location is on. Use this number to easily locate the surface in the Surfaces tab. Indicates whether the listener location is on a Floor , or Seating surface.

You can also view the same information for a selected listener in the Properties tab.

Figure 10.8 -Properties tab for a selected listener

Using listeners in sound prediction In the course of optimizing a sound system, the sound system designer may go through numerous design iterations. Listener locations allow the sound system designer to establish consistent reference locations from which to measure acoustic prediction data. This section outlines how to accomplish this in Modeler software.

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Listeners and the Sample tool The Sample tool is used to measure acoustic predictions for a particular location in your model.

Figure 10.9 -Sample tool See Chapter 11: The D 2 R ∆ STIc Process for more information on the Sample tool.

The Sample tool can be placed anywhere in a coverage map. The Sample tool will generate acoustic predictions at its location in the Time Resp. , Freq Resp. , and MTF tabs. When the tool is placed over a listener location, it will snap to the listener, and generate data for this precise location.

Figure 10.10 - Snapping the Sample tool to a listener location in a Direct Field coverage map As you change the sound system design, the listener locations provide reference points from which you can measure the effects of your design changes. Snap the Sample tool to a listener location before and after a design change to see how it affects acoustic prediction data from the exact same location.

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Using listeners to reduce calculation time You can greatly reduce calculation time by generating acoustic prediction data exclusively at listener locations. The calculation will be significantly faster because Modeler software will not calculate an entire coverage map. It is strongly recommended that you use this method when working with complex sound system designs and/or large and complex models. Follow these steps to generate acoustic prediction data exclusively at listener locations: 1. Open a model that contains listener locations and loudspeakers. 2. With the D 2 R ∆ STIc engine off, click on the Simulation tab in the Detail window and remove all checkmarks in the Map section to turn off the coverage maps. Modeler software will only draw the coverage map on the surface types that are checked.

Figure 10.11 - Remove all checkmarks from the Map section 3. In the Listeners section, place a check mark next to each surface type. This ensures that Modeler software will calculate data for all of the listener locations in the model. Modeler software will only generate data for listener locations that are located on the surface types that you check here.

Figure 10.12 - Checkboxes in the Listeners section

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4. Enable the D 2 R ∆ STIc engine by clicking on the Enable Drastic Engine button in the Map toolbar:

Figure 10.13 -Enable Drastic Engine button 5. Click the Direct button on the Map toolbar.

Figure 10.14 -Direct button 6. Select the Sample tool and snap it to a listener location.

Figure 10.15 - The Sample tool snapped to a listener location Although there is no coverage map, Modeler software will generate acoustic prediction data at the listener locations. The Sample tool cannot be placed on other parts of the Seating1  

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surface, but it can be snapped to a listener location to generate acoustic prediction data. 7. Click on the Speech Intelligibility button in the Map toolbar to generate Speech Intelligibility data at the listener locations.

Figure 10.16 -Speech Intelligibility button

8. Select the Sample tool and snap it to a listener location in the model. Notice that acoustic prediction data for the listener location is generated in the Time Resp. and MTF tab.

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