What is sound? Sounds are known as pressure waves of air. If there was no air, no one would be able to hear sounds, therefore there is no sound in space. This increases the air pressure, because more air molecules are temporarily compressed into less space. The high pressure pushes the air molecules away in different directions at the speed of sound which is around 340 metres per second. When this pressure wave reaches your ear, it pushes on your eardrum causing you to hear the sound.
Another common type of sound wave is called a periodic wave. Pressure waves from continuous vibration look like the picture below. Pressure waves are like pressure waves except they dont immediately stop, this sound wave features continuous vibration.
How is sound created?
Sound is created by using a microphone. A microphone consists of a small membrane that is free to vibrate, also with a mechanism that translates movements of the membrane into electrical signals. Acoustical waves are translated into electrical waves by using the microphone. Usually, higher pressure corresponds to higher voltage. If using a tape recorder, it also translates the waveform although this time from an electrical signal on a wire, to a magnetic signal on a tape. When you play a tape, the development gets performed in reverse, and the magnetic signal transforms into an electrical signal. The electrical signal causes a speaker to vibrate, normally with the help of an electromagnet.
How is sound recorded digitally?
-will post later its 3.06 :O
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