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Write a short note on Psychoacoustics.

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•Psychoacoustics is the scientific study of sound perception.
•More specifically, it is the branch of science studying the psychological and physiological responses associated with sound (including speech and music).
•It deals with the human auditory perception ranging from the biological design of the ear to the brains interpretation of aural information

 1.Decibel
•The decibel is used to measure sound level.
•It is a unit for measuring loudness of sound as perceived by the human ear.
•The decibel scale is a little odd because the human ear is incredibly sensitive.
•On the decibel scale, the smallest audible sound (near total silence) is 0 dB.
•Any sound above 85 dB can cause hearing loss, and the loss is related both to the power of the sound as well as the length of exposure.
•The following is the relation used when the energy of sound waves in known.
•Power in dB= 10log 10= power A / power B

 2.Dynamic Range of Human Hearing
•The human ear can nominally hear sounds in the range 20 Hz to 20,000 Hz (20 kHz).
•In addition to its remarkable sensitivity, the human ear is capable of responding to the widest range of stimuli of any of the senses.
•The practical dynamic range could be said to be from the threshold of hearing to the threshold of pain.

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