SOUND RECORDING BY: Martin miralles facs 2930

SOUND (Sound) waves are made due to vibrating air molecules These waves enter our ears and our brain translates to us what we hear Sound can be caused by anything

SOUND RECORDING The re-creating of sound waves as a physical or digitized form The processes are modelled after the human ear The recorded sound vibrates our ears similar to how the original sound did

Analog recordings Early ways of recording Changes in air pressure are recorded on a physical medium

cylinder phonograph One of the earliest sound recording devices Ability to store music and playback Invented by thomas edison (1877) Sound were contained on cylinders, the dominant medium until about 1910 Helped grow the commercial recording industry A microphone diaphragm detects changes in sound waves and records them as a scratched lines on the cylinder

Recording Discs Represented sounds as shaped grooves on the disc, as the needle scratched over it Discs were easier to make and were louder Eventually made more sales than cylinders by 1910 the improved vinyl microgroove records were introduced by 1940’s - less brittle and better performance How the discs were made: history.org/HTML/making_records.php

Magnetic tape Sound recorded as magnetized areas on the tape, proportional to the sound signals Allowed for sound to be erased and recorded on the same tape Tape was edited by actually cutting the tape and rejoining it Allowed the radio industry to pre-record parts of their program, which were all previously live

Digital Recordings stores audio as digital information (Stream of numbers) The numbers represent the changes in air pressure A response to deteriorating physical memory Allowed for easier sound editing, via computers

Compact discs Originally for sound storage - now able to store all kinds of data Small size, inexpensive material, and was rewritable A laser would read the disc, and would reflect back as electronic data Led to discs being able to represent visual data: Dvd’s and blu-ray discs

microphones Its Diaphragm creates an electronic representation of the vibrations caused by sound waves Present in many aspects of digital recording Comes in many forms Video: structed-how-do-microphones-work.html

Why we record sounds?

recording spoken words

....even when we’re not there

Educational purposes

artistic recreating of sounds

Music

Capital gain

sources tructed-how-do-microphones-work.htmlhttp://science.discovery.com/videos/decons tructed-how-do-microphones-work.html g_and_reproduction