Transcript Audiology - CLAS Users

Threshold of detection
Established according to some criterion
Other terms related to threshold

dB HL: Hearing level

dB RETSPL: Reference equivalent threshold
sound pressure level

dB SL: Sensation level
HL to RETSPL conversion
(Table 3.2 in textbook)
Frequency (Hz)
dB HL
dB RETSPL; ANSI, 1996
(for TDH 49 headphones)
250
500
1000
2000
4000
0
0
0
0
0
26.5
13.5
7.5
11.0
10.5
8000
0
13.0
What is the SPL value corresponding to a 20 dB HL 4000 Hz tone?
Is this the same for other types of headphones/sound field
measurements?
Instrumentation

Audiometer
 Pure
tone
 Speech
Pure tone audiometer
Pure tone
generator
Amplifier
Attenuator
Interrupter
Headphone/
Insert earphone
Bone conduction
vibrator
Speech audiometer
Microphone/
CD/
Tape
Amplifier
Attenuator
Interrupter
Amplifier
VU Meter
Headphone/
Insert earphone
Loudspeaker