There are two types of Nada: musical and unmusical sound. Both these types can be created by any sudden and enthusiastic wave and energy. When such a wave becomes irregular, it is known as unmusical sound. It has immense variety according to the nature of the cause. However when the motion of sound is habitually repeated at equal and small intervals of time it is known as musical sound. The unclear and noisy nature is lost making the sound more uniform and agreeable.
Scholars of music have given three names depending on the function of the musical sound: pitch of the sound, the intensity of the sound and the character of the sound. Pitch refers to the position of any sound in acute and quality musical scale. In between the distinctions are known as acute, high, low, grave, deep, sharp, flat and so on. These distinctions depend on the rapidity of the particles of the air that is in contact with the ear. Low vibrations give low tones and high vibrations produce a sharp tone. The pitch of a musical sound is decided by the rapidity with which the sounding body's vibration succeeds each other. The quicker the vibration succeeds, the higher the pitch of the note, the slower the succession of the vibration the lower is the pitch.
The extent of loudness depends on the amplitude of the vibration and the corresponding strength of the disturbance of the air in waves that are transmitted. Longer vibrations produce greater intensity of motion thereby causing an impression of greater force that is to be made on the nerves of the ear. This is known as sound intensity.
The character of a sound indicates its sources of production. It also means the character of the tone that is produced from human voice and other musical instruments.
Ahata (struck) and Unahata (un-struck) are the other two varieties of Nada. Ahata Nada is an output of the union of Prana and agni. Anahata Nada is the inner sound that travels from the Navel to the throat. Anahata Nada permeates the entire universe through inhaling and exhaling.
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