Audio Low Pass Filter (PRO only)
The Audio Low Pass Filter filter passes low frequencies of an AudioSource, or all sound reaching an AudioListener, and cuts frequencies higher than the Cutoff Frequency.
The Lowpass Resonance Q (known as Lowpass Resonance Quality Factor) determines how much the filter's self-resonance is dampened. Higher Lowpass Resonance Q indicates a lower rate of energy loss i.e. the oscillations die out more slowly.
The Audio Low Pass Filter has a Rolloff curve associated with it, making it possible to set Cutoff Frequency over distance between the AudioSource and the AudioListener.
The Audio Low Pass filter properties in the inspector.
Properties
| Cutoff Frequency | Lowpass cutoff frequency in hz. 10.0 to 22000.0. Default = 5000.0. |
| Lowpass Resonance Q | Lowpass resonance Q value. 1.0 to 10.0. Default = 1.0. |
Adding a low pass filter
To add a low pass filter to a given audio source just select the object in the inspector and then select Component->Audio->Audio Low Pass Filter.
Hints
- Sounds propagates very differently given the environment. E.g. to compliment a visual fog effect is to add a subtle low-pass to the Audio Listener.
- The high frequencies of a sound being emitted from behind a door will not reach the listener. To simulate this, simply change the Cutoff Frequency when opening the door.