I can’t believe my ears !

Subjective

• Loudness• Pitch• Tone quality

Objective

• Amplitude• Frequency• Spectrum

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

Audio frequency ranges

40 – 46,000 Hz

What? To What?

16 – 12,000 Hz

1,000 – 150,000 Hz100 – 50,000 Hz

1,000 – 100,000 Hz

70 – 150,000 HzRhythm-pitch example

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!!

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

Audiogram – “normal hearing”

Audiograms – hearing “damage”

Age related deterioration

Occupational hearing damage

Open CoolEdit

Tri-tone paradox

Rising and falling?

Shepard tone