Originally Posted by Will2007
Originally Posted by danielo
Can someone confirm/explain how this works, are ears much more sensitive to the sound arrival than volume ? and is there a good guideline for this. I was kinda shocked about the differences a few " makes (no jokes please
I don't know about more
sensitive, but our ears/brains are very sensitive to the time domain in the process of hearing. There is a very important evolutionary reason for this, as a little thought can demonstrate. Your sensitivity to minute differences in the arrival of sound varying by mere inches is what allows you to locate objects emitting sound waves in three-dimensional space.
If you were hunting for a meal and lying in wait for your prey, you would rely not only on your eyes, but also your ears for the sound of prey approaching. The slight delay you can detect unconsciously between when the sound the prey makes arrives at your left ear versus your right allows you to pinpoint where the sound is coming from. You turn your head towards the sound and look to verify its location. We humans are very good at this sort of location by time delay.
The sound image being off-center is a side effect of our ability to locate objects by observing that time delay.
In fact we have at least three different
listening experiences that give strong directional cues. Yes, time delays matter, but hearing the effects of azimuth positions and changes is not about just time.
(1) Time delay matters-the arrival time of the sound at each ear changes with azimuth.
(2) Intensity matters - off-axis sounds fall on each ear differently, giving additional azimuth cues.
(3) The shape of our heads further modify the intensity and timbre of sounds as they vary in azimuth.
Most sensations are not dependent on how our senses respond via just one path for sensing.
For example, put an ear plug in one ear, shut your eyes and have someone move around you while they are talking. You will still sense direction, even though 2 out of the 3 items above is null and you are receiving no visual cues.
Furthermore, both absolute azimuth and changes and azimuth are sensed separately. Generally, we are more sensitive to changes in azimuth than absolute azimuth.