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AUDIOMETER
BY - Anant Arun
-Student of B.ASLP From SAIMS
-Date – 10/04/2018
INDEX
 Audiometer
 Types of Audiometer
 Diagnostic or clinical Audiometer
Screening Audiometer
Computer based Audiometer
Automatic Audiometer
 Parts of Audiometer
Oscillator
Attenuator
Interrupter switch
Frequency dial
Stimulus or Tone switch
Output selector
Input selector
Talk back
AUDIOMETER
 An audiometer is an electronic instrument used by
an audiologist to quantify hearing . An audiometer
produces pure tone of various frequencies ,
atlemuates them to various intensity levels and
delivers them to transducers.
 An audiometer is for the measurement of hearing
activities and specifically to measure the hearing
threshold.
TYPES OF AUDIOMETER
 Diagnostic or clinical Audiometer
 Screening Audiometer
 Computer based Audiometer
 Automatic Audiometer
DIAGNOSTIC OR CLINICAL AUDIOMETER
 A diagnostic audiometer is an instrument capable of
performing a variety of hearing tests , including
pure tone audiometry and must conform to certain
standard of operations , as specified bt ANSI for
diagnostic audiometers.
 Available from a variety of manufactures
 Come in a variety of shape and size
 Some are designed for limited space or for portability.
SCREENING AUDIOMETER
 A Screening Audiometer is typically used for doing
hearing screening in the field or in other situations
in which a patient cannot be tested in the clinics
 Smaller in size , portable and only uses pure tone to assess
hearing
 The ranges of frequencies and intenities are more limited with
a screening audiometer than a diagnostic audiometer.
COMPUTER BASED AUDIOMETER
 With computer based audiometry there is the
capability of having the computer generate and
control the sounds , as well as the ability to store
the patient’s response , automatically analyze and
print the results and track patient database.
AUTOMATIC AUDIOMETER
 An automatic audiometer has the capability of
automatically changing the signal level based on
the response of the patient.
PARTS OF AUDIOMETER
 Oscillator
 Attenuator
 Interrupter switch
 Frequency dial
 Stimulus or Tone switch
 Output selector
 Input selector
 Talk back
 Oscillator
The oscillator generates pure tone , usually at
discrete frequencies at the octave and mid octave
frequencies of 125 , 250 , 500 , 700 , 1000 , 1500 ,
2000 , 3000 , 4000 , 6000 and 8000 Hz.
 Some audiometer do not include all of these
frequencies
 Other audiometers extend to higher frequencies
 Variations may be + or – 3% (485-515)
 The oscillator is controlled by some form of
frequency selector switch.
 Attenuator
The attenuator controls the intensity level of the
signal , usually in 5 dB steps from -10 dB to a
maximum output level that varies by frequency and
transducer type
 Typical maximum output level for earphones are :
85 dB at 125Hz , 105 dB at 250Hz etc.
 Typically maximum output levels for bone
conduction vibrator are 65dB at 500Hz & 80 dB at
1000Hz.
 Interrupter switch
This switch is used by the tester to present the tone to
the patient . The switch when pressed turns the tone on
and when released turns the tone off . The interrupter
switch is spring loaded and hence returns to its off
position when relese it.
 By using this switch , the tester can decide when to
present the tone and what should be the duration of
presentation.
 Frequency Dial
 It is used to select the different frequencies of the
stimulus.
 The various frequencies generated for testing
procedure are indicated on the selector the frequency
commonly available on the selector are 125, 250 ,500 ,
1000 , 2000, 4000, 8000Hz etc.
 On the frequency selector dial of most audiometers a
small number printed under the frequency designation
indicates the maximum hearing level that is available
for the specific frequency.
 Stimulus or Tone Switch
 It is used for presenting continuous tone.
Eg – Warble tone / Pulse tone
 Output selector
 Using this switch , the tester can select left earphone ,
right earphone or bone vibrator for presenting tone.
 Input selector
 Is is used to select speech /tone / noise.
 Talk – Back
 Selection of switch to present sound through mike
THE
END
THANK
YOU
FOR SUGGESTION
@ = anantarun27@gmail.com
Insta = anant_arun

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Audiometer

  • 1. AUDIOMETER BY - Anant Arun -Student of B.ASLP From SAIMS -Date – 10/04/2018
  • 2. INDEX  Audiometer  Types of Audiometer  Diagnostic or clinical Audiometer Screening Audiometer Computer based Audiometer Automatic Audiometer  Parts of Audiometer Oscillator Attenuator Interrupter switch Frequency dial Stimulus or Tone switch Output selector Input selector Talk back
  • 3. AUDIOMETER  An audiometer is an electronic instrument used by an audiologist to quantify hearing . An audiometer produces pure tone of various frequencies , atlemuates them to various intensity levels and delivers them to transducers.  An audiometer is for the measurement of hearing activities and specifically to measure the hearing threshold.
  • 4. TYPES OF AUDIOMETER  Diagnostic or clinical Audiometer  Screening Audiometer  Computer based Audiometer  Automatic Audiometer
  • 5. DIAGNOSTIC OR CLINICAL AUDIOMETER  A diagnostic audiometer is an instrument capable of performing a variety of hearing tests , including pure tone audiometry and must conform to certain standard of operations , as specified bt ANSI for diagnostic audiometers.  Available from a variety of manufactures  Come in a variety of shape and size  Some are designed for limited space or for portability.
  • 6. SCREENING AUDIOMETER  A Screening Audiometer is typically used for doing hearing screening in the field or in other situations in which a patient cannot be tested in the clinics  Smaller in size , portable and only uses pure tone to assess hearing  The ranges of frequencies and intenities are more limited with a screening audiometer than a diagnostic audiometer.
  • 7. COMPUTER BASED AUDIOMETER  With computer based audiometry there is the capability of having the computer generate and control the sounds , as well as the ability to store the patient’s response , automatically analyze and print the results and track patient database.
  • 8. AUTOMATIC AUDIOMETER  An automatic audiometer has the capability of automatically changing the signal level based on the response of the patient.
  • 9. PARTS OF AUDIOMETER  Oscillator  Attenuator  Interrupter switch  Frequency dial  Stimulus or Tone switch  Output selector  Input selector  Talk back
  • 10.  Oscillator The oscillator generates pure tone , usually at discrete frequencies at the octave and mid octave frequencies of 125 , 250 , 500 , 700 , 1000 , 1500 , 2000 , 3000 , 4000 , 6000 and 8000 Hz.  Some audiometer do not include all of these frequencies  Other audiometers extend to higher frequencies  Variations may be + or – 3% (485-515)  The oscillator is controlled by some form of frequency selector switch.
  • 11.  Attenuator The attenuator controls the intensity level of the signal , usually in 5 dB steps from -10 dB to a maximum output level that varies by frequency and transducer type  Typical maximum output level for earphones are : 85 dB at 125Hz , 105 dB at 250Hz etc.  Typically maximum output levels for bone conduction vibrator are 65dB at 500Hz & 80 dB at 1000Hz.
  • 12.  Interrupter switch This switch is used by the tester to present the tone to the patient . The switch when pressed turns the tone on and when released turns the tone off . The interrupter switch is spring loaded and hence returns to its off position when relese it.  By using this switch , the tester can decide when to present the tone and what should be the duration of presentation.
  • 13.  Frequency Dial  It is used to select the different frequencies of the stimulus.  The various frequencies generated for testing procedure are indicated on the selector the frequency commonly available on the selector are 125, 250 ,500 , 1000 , 2000, 4000, 8000Hz etc.  On the frequency selector dial of most audiometers a small number printed under the frequency designation indicates the maximum hearing level that is available for the specific frequency.
  • 14.  Stimulus or Tone Switch  It is used for presenting continuous tone. Eg – Warble tone / Pulse tone  Output selector  Using this switch , the tester can select left earphone , right earphone or bone vibrator for presenting tone.  Input selector  Is is used to select speech /tone / noise.  Talk – Back  Selection of switch to present sound through mike
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