SOUND RECORDING

BY: Martin mirallesfacs 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: http://www.recording-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:

http://science.discovery.com/videos/deconstructed-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

• http://www.recording-history.org/index.php

• http://science.discovery.com/videos/deconstructed-how-do-microphones-work.html

• http://en.wikipedia.org/wiki/Sound_recording_and_reproduction