basics of sound and hearing: science acoustics

· ibrahim elnoshokaty
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About this ebook

In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain.[1] Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans. In air at atmospheric pressure, these represent sound waves with wavelengths of 17 meters (56 ft) to 1.7 centimeters (0.67 in). Sound waves above 20 kHz are known as ultrasound and are not audible to humans. Sound waves below 20 Hz are known as infrasound. Different animal species have varying hearing ranges.

Acoustics is the interdisciplinary science that deals with the study of mechanical waves in gasses, liquids, and solids including vibration, sound, ultrasound, and infrasound. A scientist who works in the field of acoustics is an acoustician, while someone working in the field of acoustical engineering may be called an acoustical engineer.[2] An audio engineer, on the other hand, is concerned with the recording, manipulation, mixing, and reproduction of sound.


Applications of acoustics are found in almost all aspects of modern society, subdisciplines include aeroacoustics, audio signal processing, architectural acoustics, bioacoustics, electro-acoustics, environmental noise, musical acoustics, noise control, psychoacoustics, speech, ultrasound, underwater acoustics, and vibration.

About the author


Dr. Ibrahim Elnoshokaty

born May 1977 Member of the Egyptian acoustical to make the code to the foundations of the design and execution of the terms acoustics and noise control for buildings

Member of the acoustical society of America Funder acoustical society of Egypt engineering faculty ASU.  Ibrahim elnoshokaty holds a Ph.D. from Georgia state university2006 (electro-acoustics) and he starts his career after finishing BA major sound engineering 1999. start as sound engineer in cinema production and he did some of big movies like (al-Sadat days, sahar elayaly). he did first commercial radio in Egypt as sound department manager 2003 and it was booming and he active first RDS in Arab world  . work as project manager in melody radio network ( Lebanon , Syria , Jordan) and it was connected network by RDS alternative frequency, during that he hold master degree from Georgia state university2003, after holding master degree he became technical director for melody tv and did some of famous crystal clear screen like melody drama , melody tuns , melody aflam , melody classic , melody trix and thin moved to modern sport and did first free to air sport channel and it was channel no 1 in Egypt 2007 as CTO , during that he did his Owen business enoshmink technology 2005 it was very small company till 2007 GN4me starts it promising project that spread 400 cinema screen in 4 years and that project was at enoshmink tech hand by dr. Ibrahim elnoshokaty effort in that field by customize and R and D of sound isolation material and did real time equalization for the auditorium that made the experience of  watching movie is good for the audience and did first rear projection in Egypt ( deep mail alex ) and did first auditorium at elnajaf elasharf Iraq and his company work in sound innovation like sound treatment painting and it approved by admin capital city elmasa hotel and it work to reduce reverb from the dome hall second enocrso that system is monitoring and management system for public address system sharedin is online plug and play radio and social media posting platform and the awared he take.                 

During my PhD I obtained the following Certificates 2006 :

He holds a certificate from Georgia state University in U.S.A is awarded of Excellence.

He holds a certificate from Georgia state University in U.S.A is awarded of Distinction.

He holds a Bachelor of sound Engineering 1999.

HONOURS AND ACTVITIES

Appreciation Certificate: 

Member of acoustical society of America.

Member of acoustical society of Egypt. 

Member of international society of physics

Appreciation Certificate from Housing & Building National Research Center 2013

Appreciation Certificate from Cofermetal 2012.

Appreciation Certificate from Armstrong 2011

Appreciation Certificate from Palestine Radio 2009

Appreciation Certificate from Egyptian Radio and Television Union 2007

Appreciation Certificate from Nugoom F.M  2007

Appreciation Certificate from Spin F.M 2007

Appreciation Certificate from Sout Elmadena 2007

Appreciation Certificate from Ecreso(fm transmitter manufactory)  2008

Appreciation Certificate from Modern sport 2005

Appreciation Certificate from Moldy 2002


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