1. I can’t believe my ears !

3. Subjective Loudness Pitch Tone quality Objective Amplitude Frequency Spectrum

4. 440 Hz tone stepping down from 0 to -80 dB in 10 dB steps

5. Audio frequency ranges 40 – 46,000 Hz What? To What? 16 – 12,000 Hz 1,000 – 150,000 Hz 100 – 50,000 Hz 1,000 – 100,000 Hz 70 – 150,000 Hz Rhythm-pitch example

6. A little experiment ! Put your hand in the air Put your hand down when you can’t hear the sound any more. Keep an eye on who puts their hands down – and no cheating!!

7. Presbycusis After the age of 20 you lose 2 kHz from the upper range every 10 years 30 years - 18 kHz 40 years - 16 kHz 50 years - 14 kHz 60 years - 12 kHz 90 years - 6 kHz

8. Audiogram – “normal hearing”

9. Audiograms – hearing “damage” Age related deterioration Occupational hearing damage

10. Open CoolEdit CoolEdit

12. Tri-tone paradox

13. Rising and falling?

14. Shepard tone