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Sample Rate

Approaching the desert, you might notice volcanic boulders thrown from a huge volcano. On impact, the boulders will either trigger a Boulder_Far Random Container or Boulder_Near Blend Container, depending on the distance to the adventurer. The Boulder_Far sound will seem very muffled and distant, whereas the Boulder_Near sound will have more energy in the high frequency spectrum. Let’s reduce the sample rate of the Volcanic Boulders.

  1. In the Project Explorer's Audio tab, expand the Actor-Mixer Hierarchy > Default Work Unit > World > Objects > Objects > Object_Destruction > Object_Destruction > Destruction_VolcanicBoulder, and select the Boulder_Far Random Container.

  2. In the Object Tab, select the Conversion tab.

  3. In the Conversion Settings group box, enable the Override parent, and using the Selector, select the Objects > Destruction_General Conversion Settings.

  4. In the Conversion Settings group box, make sure the Mode list box is set to Use ShareSets and click the Pop Out button next to the Destruction_General Conversion Settings.

    In the Audio Sources list of the Conversion Settings Editor, notice how the Object_VolcanicBoulder_Far Audio Source is currently displaying a Sample Rate of 48,000 Hz. This is due to the Sample Rate setting As Input.

    Let’s reduce the Sample Rate to the minimum value and slowly increase it until you feel there are no artifacts or the increase in Sample Rate does not change the sound.

  5. Set the Sample Rate to the lowest value (6,000 Hz) on your working platform.

  6. Click Convert….

    [Note]

    If your current working platform is not selected by default, you need to select your working platform in the Platform Selector, located in the Wwise toolbar.

  7. In the Audio File Conversion dialog, click Convert.

    Next, you can play the sound. Make sure the Boulder_Far Sound SFX is selected.

  8. In the Transport Control, press Play.

    If you listen closely, you’ll hear a slight high frequency rattle due to the low Sample Rate.

  9. Increase the Sample Rates one by one until you’re satisfied with the sound quality.

    Suggested value: 12,000 Hz.

While the sound might have been imported with a sample rate of 48,000 Hz, there’s simply no reason to keep it in that sample rate if it will sound identical in a lower one. The same method can be applied on other sounds, to measure how low in sample rate they could go.

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