CHAPTER 12 - PowerPoint PPT Presentation

lel
chapter 12 n.
Skip this Video
Loading SlideShow in 5 Seconds..
CHAPTER 12 PowerPoint Presentation
play fullscreen
1 / 7
Download Presentation
CHAPTER 12
132 Views
Download Presentation

CHAPTER 12

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. CHAPTER 12 Sound Localization and Binaural Hearing

  2. Binaural Hearing: Some Terms • AZIMUTH-angle from straight ahead in horizontal plane. • Minimum Audible Amgle- jnd for azimuth.(smallest at 0 degrees, largest near 90 and 270 deg.) Binaural

  3. LOCALIZATION & LATERALIZATION LOCALIZATION: • ability to determine location of a sound source in the sound field. LATERALIZATION: • perceived position of sound within your head for stimulation under headphones. Binaural

  4. Sound Localization Binaural

  5. LOCALIZATION CUES: • INTERAURAL TIME DIFFERENCE works best at low freqs: up to 0.65 ms at 90 deg. • INTERAURAL INTENSITY DIFFERENCE works best at high freqs: where head shadow exists. • PRECEDENCE EFFECT people can tell which ear was stimulated first. Binaural

  6. Masking Level Difference (MLD) Masker and Signal in Each Ear Test Threshold twice: • once with identical signals in each ear • once with 180 degrees out of phase R to L Binaural

  7. Masking Level Difference (MLD) (cont’d) • Signal is easier to detect with the interaural phase difference • Shift in threshold is about 12 to 15 dB at low frequencies. • Reflects processing in the auditory brainstem) Binaural