GOVERNMENT ENGINEERING COLLEGE - BHARUCH014

E.C Div.:- A

PHYSICS 2110011

Classification and Characteristics of

sound

Nakrani Pratik R. 130140111046

INDEX

What Is Sound

Classification Of Sound

Classification of Audible Sound

Properties Of Musical Sound

Properties Of Noise

Characteristics Of Musical SoundPitch Loudness Timbre

WHAT IS SOUND??

• Sound is a Vibration In an Elastic Medium With definite Frequency & Intensity…

• Longitudinal wave .• requires a medium .• cannot travel in a vacuum.

CLASSIFICATION OF SOUND

Infrasound Audible Sound UltraSound

Frequency(f) Based

f < 20 Hz 20 Hz < f < 20 kHz f > 20 kHz

CLASSIFICATION OF AUDIBLE SOUND

Musical• The Sound Which Produces

Pleasing Effect On The ear is Called Musical Sound.

• Sounds Of Sitar, Violin,Flute

Noise• The sound That Produces a jarring

effect on the ear and unpleasant to hear is called noise.

• Sound Of Road Traffic, Crackers,Aeroplane

PROPERTIES OF MUSICAL SOUND

• Regular in Shape.• Have definite Periodicity.• They do not undergo a sudden change in

amplitude.

• Irregular in Shape.

• Do not have Definite Periodicity.

• They Undergo a Sudden Change In Amplitude.

Properties Of Noise

CHARACTERISTICS OF MUSICAL SOUND

PitchRelated To Frequency Of Sound

LoudnessRelated To Intensity Of Sound

TimbreRelated To Quality Of Sound

PITCH

• We can describe pitch by frequency.

• Rapid vibrations of the sound source (high frequency) produce sound of a high pitch.

• Slow vibrations (low frequency) produce a low pitch.

• Different musical notes are obtained by changing the frequency of the vibrating sound source.

PITCH

• This is usually done by altering the size, the tightness, or the mass of the vibrating object.

• High-pitched sounds used in music are most often less than 4000 Hz, but the average human ear can hear sounds with frequencies up to 18,000 Hz.

LOUDNESS

• Loudness is Characteristics which is Common to all sound

• As we seen Loudness Is

Classified in two types.

Musical Sound

Noise

LOUDNESS

• Loudness & Intensity are Releted to each other by relation

Weber-Fechner law

L log IL = K log I

Where K Is Constant

From The Above Equation…

𝑑𝐿𝑑𝐼

=¿𝐾𝐼 𝑑𝐿

𝑑𝐼=𝑆𝑒𝑛𝑠𝑖𝑡𝑖𝑣𝑒𝑛𝑒𝑠𝑠𝑂𝑓 𝐸𝑎𝑟

Therefore, Loudness is physiological Quantity.

TIMBRE

• Quality Of Sound Which Enables us to distinguish between two sounds having the same loudness & Pitch.

• Depends on the Presence of overtones.

TIMBRE

• It helps Us To Distinguish musical notes emitted by different musical instruments & Voices Of different Person Even Though the Sound have Same

Pitch &

Loudness

Hope You Will Enjoy it………

THANKS FOR WATCHING