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Huron & SNAP Documentation

Huron & SNAP Documentation

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Custom Head Filter Specifications<br />

Creating Valid Head and Room Filter Files Using Matlab<br />

Summary<br />

THE SIMULATION TOOLS<br />

BinScape allows the user to load a new set of binaural head<br />

filters in addition to the existing head filters.<br />

Head filters provide the directionality of BinScape 3D rendered<br />

sound sources. The user can then switch between the standard<br />

head filters and their custom set of head filters.<br />

1. Load a new set of head filters by selecting "Load Custom…"<br />

and following the prompts to load the Centre, Front<br />

Common, Rear Common, Front Difference and Rear<br />

Difference filters.<br />

2. You can now switch between the Standard head filters and<br />

the Custom head filters by selecting from the listbox. You<br />

can also load a new set of custom head filters over a<br />

previously loaded custom set as above.<br />

3. A valid set of custom head filters consists of five .sim files,<br />

each 128 samples long. The first sample of all head filters<br />

occurs at t=0.<br />

4. The meaning of the five head filters is as follows:<br />

5. Centre: average of the HRIRs to both left and right ears for<br />

a source at 0 degrees - ie directly in-front of the listener.<br />

6. Front Common: common-mode portion of near and far ear<br />

HRIRs to a source at 45 degrees to the listener direction.<br />

7. Front Difference: difference-mode portion of the near and<br />

far ear HRIRs to a source at 45 degrees to the listener<br />

direction.<br />

8. Rear Common: common-mode portion of near and far ear<br />

HRIRs to a source at 135 degrees to the listener direction.<br />

9. Rear Difference: difference-mode portion of near and far<br />

ear HRIRs to a source at 135 degrees to the listener<br />

direction.<br />

For an example of how to make valid and proper Head and<br />

Room filter .sim files for BinScape Custom, see the Matlab<br />

script file makecustomfilters.m, supplied with BinScape<br />

Custom.<br />

• BinScape performs 3D positional-audio of up to 32 source<br />

objects to a single listener position.<br />

• BinScape has filters to simulate 3 rooms of different acoustic<br />

properties. Headtracking is also possible with additional<br />

tracker tool hardware.<br />

HURON TECHNICAL MANUAL PAGE 78

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