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Rikiki (![[info]](http://www.journalfen.net/img/userinfo.gif){kind=small} rikiki) wrote,@ 2008-09-02 10:05:00 |
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02 Sep 08 - THEA283 notes part 2 - Psychoacoustics
- Interrelationship of visual and auditory space
- humans follow source of sound with sight
- sight is limited
- sound is faster in detection and localization - also spherical
- both ears necessary for detection of depth and direction
- Derivation of direction
- perceptionally, sound reaches from one of four primary directions: left, right, front, or rear
- direct front or back reaches both ears at same time
- sound from the back has difference
- from the sides, the ear on the same side hears clearly, the other ear suffers from obvious distortion
- brain can triangulate location of sound using both ears
- most triangulation on the horizontal axis due to placement of ears
- Environmental ambiance
- environment affects perception and nature of sound
- boundaries provide echoes away from listener
- direct sound reaches listener before reflected sound
- reflected sound can reach ears as quickly as 3 milliseconds after direct sound
- Psychoacoustic illusions
- perception is not solely result of stimulus reaching ears or eyes
- brain also affects by using knowledge of body position, etc.
- loudness illusion
- increase in perceived intensity leads to change in perception of loudness
- Phase & Time illusions
- putting a delay on one speaker - Hass effect - leads to perceived change in location of sound
- delaying amplified sound in theater, so that the actors are not overshadowed and don't sound overamplified
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