1 / 25

Sound and Hearing

Sound and Hearing. Decibels. dB = 20log(P1/Po) P = amplitude of the sound wave Po = reference pressure = 0.0002 dynes/cm2 Decibels compress the large range of possible pressures into more manageable units

stephanie-ellison
Download Presentation

Sound and Hearing

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Sound and Hearing

  2. Decibels dB = 20log(P1/Po) P = amplitude of the sound wave Po = reference pressure = 0.0002 dynes/cm2 Decibels compress the large range of possible pressures into more manageable units Converts a range of 0.0002 (threshold pressure) to 2,000 (jet at take off) to a range ofr 0 to 140 dB

  3. _____________________________________________________ Sound SPL (dB) _____________________________________________________ Barely audible sound (threshold) 0 Leaves rustling 20 Quiet residential community 40 Average speaking voice 60 Loud music from radio/heavy traffic 80 Subway 100 The Rolling Stones 120 Jet engine at takeoff 140 _____________________________________________________

  4. Sine Wave

  5. 90° out of phase

  6. 180° out of phase

  7. Three primary dimensions of sensations associated with sounds with periodic waveforms Pitch, loudness and timbre. Pitch - sensation of "altitude" or "height" of a tone. Loudness - sensation of "intensity" of a tone. Timbre - quality of a sound.

  8. Psychological Dimension Associated Physical Dimension Pitch Frequency Loudness Amplitude Timbre Spectrum

  9. Middle Ear

  10. Inner Ear

  11. Organ of Corti

  12. When sound causes the basilar membrane to deflect upward, the reticular membrane moves up and inward causing the stereocilla to bend outward

  13. Auditory Pathways

  14. Primary and secondary auditory cortex Tonontopic organization - numbers are characteristic frequencies

More Related