Define threshold of hearing, intensity level of sound, and sound pressure level (SPL). Give the typical dB Values of SPL for threshold of hearing, noisy restaurant, and jet engine.

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(i) The hearing threshold is the sound level below which is a person's ear is unable to detect any sound.

The hearing curve

Sound Pressure Level

(i) Sound Pressure Level (SPL) is used to define the sound level.

(ii) SPL is the ratio of the absolute sound pressure to a reference level which is mostly taken as the Threshold of Hearing.

SPL (dB)	Source of Sound
0	Threshold of Hearing
10	Silent recording studio; Breathing
20	Silent living room; Rustling level
30	Quiet office; Whisper
40	Quiet conversation; Refrigerator
50	Average office noise with printer, running AC; Light traffic; Rainfall
60	Conversational speech
70	Busy street; Noisy restaurant
80	Home stereo; Blow dryer
90	Heavy truck traffic
100	Subway trains
110	Power Tools; Shouting far
120	Planes on airport runway
130	Threshold of pain
140	Rock singer screaming into microphone
150	Jet take-off; Firecracker; Artillery fire
160	Jet engine - closeup

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