T H E H E A R I N G S E N S E

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T H E H E A R I N G S E N S E

  1. 1. THE HEARING SENSE INTRODUCTION
  2. 2. SOUND <ul><li>SOUND WAVES </li></ul><ul><li>Vibrations of the molecules of air that surrounds us. </li></ul><ul><li>Have the same properties of light waves </li></ul>
  3. 3. SOUND <ul><li>PROPERTIES OF SOUND WAVES </li></ul><ul><li>WAVELENGTH </li></ul><ul><li>Interpreted by the brain as frequency and pitch </li></ul><ul><li>AMPLITUDE </li></ul><ul><li>- Interpreted as volume </li></ul><ul><li>PURITY </li></ul><ul><li>- A richness of tone </li></ul>
  4. 4. SOUND <ul><li>FREQUENCY OF SOUNDS IS MEASURED IN HERTZ </li></ul><ul><li>HUMAN LIMITS ARE BETWEEN 20- 20,000 HERTZ </li></ul><ul><li>ACCURATE HEARING OCCURS ON 1,000 HERTZ </li></ul>
  5. 5. SOUNDS <ul><li>SOUND WAVES </li></ul><ul><li>THE HIGHER THE WAVE </li></ul><ul><li>THE LOUDER THE SOUND </li></ul><ul><li>THE LOWER THE WAVE </li></ul><ul><li>THE SOFTER THE SOUND </li></ul>
  6. 6. SOUND IF THE WAVES ARE CLOSE TOGETHER IN TIME, THE PITCH WILL BE PERCEIVED AS HIGH PITCH . IF THE WAVES ARE FARTHER APART, IT WILL BE PERCEIVED AS HAVING A LOWER PITCH
  7. 7. SOUND <ul><li>DECIBEL </li></ul><ul><li>- unit of measure for loudness </li></ul><ul><li>NOISE AFFECTS </li></ul><ul><li>STRESS </li></ul><ul><li>LEARNING </li></ul><ul><li>PERFORMANCE </li></ul><ul><li>PSYCHOLOGICAL AND PHYSICAL WELL-BEING </li></ul><ul><li>AGGRESSION </li></ul>
  8. 8. SOUND <ul><li>135 decibel – Headphone turned to highest volume </li></ul><ul><li>125 decibel – Jackhammer, 3 feet away </li></ul><ul><li>120 decibel – Sound that causes pain </li></ul><ul><li>110 decibel - Music concert </li></ul><ul><li>100 decibel – Chain saw or subway train, 20 feet away </li></ul><ul><li>85-90 decibel – Above this level causes hearing loss </li></ul><ul><li>70 decibel – vacuum cleaner </li></ul><ul><li>60 decibel – normal conversations </li></ul><ul><li>40 decibel – quiet office </li></ul><ul><li>30 decibel – library </li></ul><ul><li>15 decibel – normal breathing </li></ul>
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