Sound - Acoustics & Psychoacoustics

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Information about Sound - Acoustics & Psychoacoustics

Published on March 14, 2014

Author: sk_alfahad



Multimedia Systems

Psychoacoustics and Acoustics


WHAT IS SOUND..? Definition - “ Vibrations that travel through the air or another medium and can be heard when they reach a person or animal‟s hear. ”

I N T R O D U C T I O N  Sound comprises the spoken word, voices, music and even noise.  A pleasant sound has a regular wave pattern. The pattern is repeated over and over.  But the waves of noise are irregular. They do not have a repeated pattern.

 Noise:  Noise can be defined as ‘undesirable’ or ‘disagreed’ sound or disturbance.  What is sound to one person can very well be a noise to somebody else.  Sound is been measured in (dB) decibels.

RECORDING AUDIO (SOUND) FILE'S. - Microphones: connect microphone to the microphone port and record using sound recorder or via system software.

 Sound is reflected, transmitted, or absorbed by the materials it encounters.  Soft surfaces, such as textiles and tend to absorb sound waves, preventing them from further motion.  hard surfaces, such as ceramic tile, wood, tend to reflect sound waves, causing „echo‟. Reverberation is the term used to describe sound waves that are reflected off of surfaces.  Dense, massive, materials, such as concrete or brick, tend to transmit sound waves through the material.

 Definition: - “ A science that deals with the production, control, transmission, reception, and effects of sound. ” For example, dog whistles vibrate at a higher frequency than the human ear can detect, while evidence suggests that dolphins and whales communicate at frequencies beyond human hearing (ultrasound). Many animals hear a much wider range of frequencies than human beings do.

 Sound is a mechanical wave and therefore requires a medium in which it can travel.  Acoustics is classically divided into sound and vibration.  Sound refers to waveforms traveling through a fluid medium such as air.  Vibration describes energy transmitted through denser materials such as wood, steel, stone, dirt, drywall or anything besides a fluid.  It is not heard as much as felt, due to its extremely low frequency, which is below the range of most human hearing.

 Sub – Disciplines of Acoustics :  Aero-Acoustics - Its concerned with how the gas flows produce sound & has applications in aeronautics. Eg. Sound and Shockwaves produced by jets.  Architectural-Acoustics - Its concerned with the study of sound in buildings like halls & auditoriums.  Bio-Acoustics - Its done with the sound made by animals like Elephants , Whales, Bats, etc.; Biomedical-Acoustics - Its concerned with the study of sound in the medicines, Eg. Ultrasonography, psycho-acoustics concerned with the hearing & localization of sound related to human beings;

 Sub – Disciplines of Acoustics :  Speech Communication – Concerned with the production , analysis, transmission & recognition of speech.  Ultrasonic – Its the study of High frequency sounds beyond human range.  Musical-Acoustics – Concerned with the study of sound in relation to musical instruments. Eg. Guitar

 DEFINITION : - “ the study of hearing - relationship between the physical properties of sound and the sensations they produce. ” - Hearing – the process that transforms sound waves into neural signals that can be interpreted by our brain. - Sound Waves - fluctuations in air pressure across time, created by the motion or vibration of an object (e.g. the vibration of violin string).

WHAT IS PSYCHOACOUSTICS ?  Psychoacoustics is a branch of science studying psychological responses associated with sound (speech & music).

 Psychoacoustics has enjoyed a relation with Comp. Science, Comp. Engineering & Computer Networking.  It’s also applied today with music, where the musicians & artists continue to create the new auditory experiences by removing unwanted frequencies of instruments.  It studies the relationship between & perception of sound in order to explain auditory behavioral responses of human listeners.

Psychoacoustics include topics related to music psychology also known as musicology. It aims to explain & understand musical behavior. Music psychology is a field of research with the music performance, music composition, music education etc.

S U B J E CT - M U L T IME DIA S Y S T EMS Presented by : Fahad Shaikh..


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