Musical Sound and Noise

The branch of physics that deals with the production, transmission and reception of sound is called acoustics. These phenomena are called acoustics phenomena. Echo, reverberation and different wave phenomena such as reflection, refraction are some of the examples of acoustics phenomena.  These phenomena has very significant role in our daily life. As it has various unnecessary effect such as echo, reverberation etc that may hamper our daily life, certain acoustical consideration have to be taken before designing any things related to sound such as buildings, devices, rooms etc.

Musical sound and noise

Musical Sound: The sound which produces pleasing sensation to the listeners is called musical sound. Such sound is produced by regular and periodic vibrations. Sound produced by different musical instruments such as piano, violin, flute, xylophone are some of the examples of musical sound. In musical sound, there is regular, periodic and continuous succession of compressions and rarefactions. There is no sudden change in amplitude and loudness of the sound. The waveform of musical sound is given below.

Musical sound

Noise: The sound that produces unpleasing effect on hearing is called noise. Noise is unpleasant and has discontinuous and non uniform succession of compressions and rarefactions with sudden change in amplitude . Sound produced by moving vehicles, thunder, human voice, falling body are some of the examples of noise. The waveform of noise is given below.

Noise

Difference between musical sound and noise

Musical sound    Noise
It gives pleasing sensation to the listeners. It gives unpleasing sensation to the listeners.
Frequency of musical sound is generally high. Frequency of noise is usually low.
There is no sudden change in amplitude. There is sudden change in amplitude.
Sound produced by different musical instruments such as piano, violin, flute, xylophone are some of the examples of musical sound. Sound produced by moving vehicles, thunder, human voice, falling body are some of the examples of noise.

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