تفاوت نت و نویز

Third Grade Social studies Science projects: Sound Physics: The Difference Between Note and NoiseMusical Notes are periodic and somewhat regular. They are pleasing to our ears and minds, and sound has been one of the greatest forms of expression since the beginning of time. Unpleasant sound is often described as noise. Noise is more irregular. When looking at the waveform, a visual representation of sound, music has more patterns and gradual variances in volume, butnoise is jagged and sporadic.

What is or is not auditory “noise” often depends on who is listening. Tapping a pencil on a desk may be rhythmic and musical to someone, but an irritating noise to another.
In all technicality, music can be composed of notes at any arbitrary physical[clarification needed] frequency. Since the physical causes of music are vibrations of mechanical systems, they are often measured in hertz (Hz), with 1 Hz meaning one vibration per second. For historical and other reasons, especially in Western music, only twelve notes of fixed frequencies are used. These fixed frequencies are mathematically related to each other, and are defined around the central note, A4. The current “standard pitch” or modern “concert pitch” for this note is 440 Hz, although this varies in actual practice (see History of pitch standards).