Difference between revisions of "Sound for Interaction class 5"

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[[Category:Sound for Interaction]]
 
[[Category:Sound for Interaction]]
  
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Project 2 - Radio Commercial
 
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Process
 
  
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  1. Record 3 takes of 30 Second Commercial
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{{Template:Interference and Beats}}
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          * Have talent practice Reading
 
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          * Set Level (~-8db)
 
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          * Record
 
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          * Carefull annunciation and consistant voice
 
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          * Save file to folder
 
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  2. Edit
 
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          * Edit for Quality
 
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                o Best parts of the three takes or fix trouble spots
 
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                o Remove unwanted noise
 
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                o Balance Volume
 
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                o Normalise - optional
 
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          * Time and Pacing
 
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                o Voice should be 29 seconds
 
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                o Add remove space between words,phases, sentences - meter?
 
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                o Time Compress Expand -optional
 
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          * Overall Voice Qualitly
 
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                o EQ -optional
 
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                o Compressor -optional
 
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                o Normalise -optional
 
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  3. Mix
 
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          * Select background music/effects
 
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          * Mix with voice watch for intelligibility
 
  
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DirectX - non destructive real time effects like TDM but runs on CPU
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{{Template:Frequency and Pitch}}
  
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DirectX and TDM effect are restricted by the amount of processing power.
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{{Template:Phase}}
  
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TDM's run on a single dedicated processor and DirectX effects run on the CPU.
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{{Template:Timbre/Harmonic structure}}
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We can only affect three thing Amplitude,Time,Frequency
 
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Amplitude
 
  
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    * Mute
 
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    * Normalize
 
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    * Fade (in/out/graphic) or Envelope
 
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    * Compressor
 
  
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Time
 
  
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    * Time Stretch
 
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    * Pitch Bend/Shift
 
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Frequency
 
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    * EQ
 
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          o http://www.canimi.com/webnew/audiospectruma.html
 
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          o EQ by the Octave
 
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          o Eq Primer
 
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Show Reverb
 
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Assign Effects
 
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You book and these links may help
 
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http://www.harmony-central.com/Effects/audio-effects-faq-10.txt
 
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http://www.harmony-central.com/Effects/effects-explained.html
 
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http://users.iafrica.com/k/ku/kurient/dsp/effects.html
 
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Audio Effects presentations.
 
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    * About 10 mins
 
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    * Explain
 
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    * Demonstrate
 
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Each group will research a short list of audio effects. Each group will give a presentaion to the class about their research. The presentation should explain how each effect works, what aspects of the audio signal it is affecting ( time, frequency, amplitude ) and show examples of the effect in action. The best way to learn about the effect is to play with it. Start with the presets and then try to make some of your own settings. All of the effects on each list are related in some way. The presentations should be about 10 min in length.
 
  
 
==Home Work==
 
==Home Work==
  
 
[[Sound for Interaction Flash Piano]]
 
[[Sound for Interaction Flash Piano]]

Latest revision as of 22:42, 1 July 2007

Interference and Beats

adding sound waves

  • Interference and Beats

http://www.school-for-champions.com/science/soundbeat.htm

Difference between two notes is called interval

Frequency and Pitch

Frequency if the measure of how many cycles a wave complete per second.

Frequency (f) is measures in Hertz

Period (T) in the inverse of infrequency is is measured in seconds

Frequency = Cycles/Second Perdiod = Seconds/Cycle

f = 1/T T = 1/f

The perception is frequency is know as pitch.

Intervals

An octave is doubling of the frequency.

ie 440 Hz is an A

the next A after 440 Hz is 880 Hz

In westen music the octave is divided into 12 semi-tones

http://thinkzone.wlonk.com/Music/12Tone.htm

http://en.wikipedia.org/wiki/Interval_(music)

http://www.musicalintervalstutor.com/

http://www.keystrokepublishing.com/html/sight_singing_tips.html

Phase

Phase in measured in degrees.

The phase of a sound has to do with the time domain.

Adding two Simple Harmonic waves -Applet

Adding two Simple Harmonic waves2 - Applet

http://library.thinkquest.org/19537/java/Wave.html

Timbre/Harmonic structure

Timbre is a descriptive word used to help describe the 'color' and envelope of a sound.

All sound is made up of simultaneous sounding tones. In the 1700 Joseph Fourier a French mathematical physicist proved that all sound can be synthesized be adding sine waves. The way these sine waves are added together make things sound different.

http://www.gac.edu/~huber/fourier/

Different sound don't sound the same due to different fundamental frequencies, harmonics, complexity, and envelope.

Timbre is made up of Harmonics and Envelope. The Harmonics define the different frequencies present in a a sound and the envelope defines the amplitude through time.

Harmonic Structure

http://www.rane.com/par-t.htm Harmonics defined @ rane


Understanding Harmonics Fundamental Frequency and Harmonics Instruments 

   * Guitar string
   * Open-End Air Columns
   * Closed-End Air Columns

Natural harmonics are multiple of the fundamental/

Understanding Harmonics @ Harmony Central

http://ptolemy.eecs.berkeley.edu/~eal/eecs20/berkeley/scale/demo/timbre.html

http://www.umanitoba.ca/faculties/arts/linguistics/russell/138/sec4/source.htm

http://library.thinkquest.org/19537/cgi-bin/showharm.cgi



Home Work

Sound for Interaction Flash Piano

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