Audiology
Audiology
SoundA form of energy---produced by vibrationDifferent velocity in differentmediaThe character:Frequency (pure tone or complex sound)Intensity (differentfromloudness)Pitch (subjectivesensation)
Sound ◼ A form of energy-produced by vibration ◼ Different velocity in different media ◼ The character: ◼ Frequency (pure tone or complex sound) ◼ Intensity (different from loudness) ◼ Pitch (subjective sensation)
Intensity30 dBWhisper60 dBNormal conversation Shout90 dB120dBDiscomfort of ear130dBPain of ear
Intensity ◼ Whisper 30 dB ◼ Normal conversation 60 dB ◼ Shout 90 dB ◼ Discomfort of ear 120dB ◼ Pain of ear 130dB
Intensity +loudnessIntensity is physicalLoudness is just sensationGenerally more intensitygreater loudnessInpatients situation is different
Intensity ≠loudness ◼ Intensity is physical ◼ Loudness is just sensation ◼ Generally more intensity greater loudness ◼ In patients situation is different
Alexander Graham BellThe inventor of telephoneBel is use to measure the intensity ofsound dB (decibel)= 1/10 belSPL sound pressurelevelHL hearing levelnHL normal hearing level
Alexander Graham Bell ◼ The inventor of telephone ◼ Bel is use to measure the intensity of sound ◼ dB (decibel) = 1/10 bel ◼ SPL sound pressure level ◼ HL hearing level ◼ nHL normal hearing level
Noise - a complex soundWhitenoisehave all frequencypeople can hear 20to 20000 HzNarrowband noise with certain frequencySpeechnoisefrequency in speechrange(300-3000Hz)people speech500-2000Hzaudiometrictesting125-8000HzUsefor masking
Noise – a complex sound ◼ White noise have all frequency people can hear 20 to 20000 Hz ◼ Narrow band noise with certain frequency ◼ Speech noise frequency in speech range(300-3000Hz) people speech 500-2000Hz audiometric testing 125-8000Hz ◼ Use for masking
Assessment of hearingThree type of hearing lossconductive hearing loss sensotineural hearing loss (SNHL) mixed hearing loss
Assessment of hearing Three type of hearing loss ➢ conductive hearing loss ➢ sensotineural hearing loss (SNHL) ➢ mixed hearing loss
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