You can download Sound Sheet by clicking on the download button below The instruments are of different shapes and size and they produce different harmonics of loudness hence their sound can be easily distinguished. A sound of good quality is pleasant to listen. As different sources produce different sounds, the timbre helps us to distinguish between them. The word timbre also describes the term quality. As the amplitude of vibration increases, sound also increases. Suppose when we pluck a string of the sitar it starts vibrating with low amplitude and if we apply more energy by plucking more strongly, the string will vibrate with the greater amplitude and produce a loud sound. It will be louder when the amplitude is high. The loudness depends on the amplitude of the vibration. Loudness is measured in decibel (dB). It is given as: It is always a relative term and is a dimensionless quantity. The loudness is a sensation of how strong a sound wave is at a place. For example, when a small baby speaks something, his/her voice has a higher frequency so in case of a baby the pitch is higher than the pitch of a man. The sound with a high frequency is called as shrill. A note has a higher pitch when the frequency is high and a note of low frequency has a low pitch. Pitch depends upon the frequencies of the sound wave. We can identify a female and male voice without seeing them.
Pitch is a characteristic of sound by which a correct note can be distinguished from a grave or a flat note.
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