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
