Quiz: Sound Source Localization – Holophonix Learning Platform

1. Localization of a sound source

5

The main perceptual mechanisms for localizing a sound source are:

head-related transfer function filtering (HRTF).
is related to the increasing directivity as a function of frequency of the radiation of an acoustic source.
the interaural intensity difference (IID) or level difference (ILD).
the interaural time difference (ITD).
is related to low frequencies.

2. Position of a sound source

3

If the time and intensity differences between the ears of a listener are zero

the listener cannot precisely identify the elevation of the source.
the listener cannot perceive the source.
the source is localized by the listener in the vertical plane relative to them.

3. The cone of confusion

3

The cone of confusion describes an area of space around the listener

where all sources are localizable.
where interaural time and intensity differences are constant.
in which the position of a source cannot be clearly identified.

4. Sound source localization cues

4

The localization cues of a sound source are:

The filtering related to the shape of the head (HRTF).
The interaural time difference (ITD).
The interaural intensity difference (IID) or level difference (ILD)
related to the directivity of sound sources.

5. Law of the first wavefront

2

If two sound sources emit the same signal (level and time) from two different positions and at different distances

The signal is localized at the position of the nearest source.
The signal is localized at the position of the farthest source.

6. Echo and sound precedence

3

If two sound sources emit the same signal (same level and timing) from two different positions and at different distances. A sensation of repetition (delay, echo) is perceived

if the path difference to reach the listener is approximately 10 m.
if the travel time difference is greater than approximately 20 to 30 ms.
if the path difference to reach the listener is approximately 5 m.

7. Distance perception

3

The distance of a source is perceived

based on the level of its low frequencies.
through its interaction with the acoustic environment: reverberation.
with the movement of the source through space.

8. Critical distance

4

In a reverberant environment, the critical distance between a sound source and a listener

means that beyond this distance, the source becomes increasingly difficult to localize because the reverberant sound exceeds the direct sound.
corresponds to the distance at which the level of the direct sound equals the level of the reverberant sound.
has an impact on intelligibility.
has no impact on its localization.

9. The reverberation level

2

The reverberation level

improves intelligibility if it is sufficiently high.
creates a sensation of distance if the direct sound is sufficiently low.

Sound Source Localization

Quiz: Sound Source Localization Quiz