What is sound ?
Sound is different from noise.
Sound is produced by continuous and regular vibrations that travel through air, water or matter. The frequencies in a range of 20 to 20,000 hertz can be heard by the ears of animals and people.
Sound the gong!
Sound is typical for speech and music.
Special sound effects are used in both video and audio.
Good loudspeakers or earphones are a must
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