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Sound technology

Sound technology. Basics of Sound. Sound is perhaps the most sensuous element of multimedia Types of sound in multimedia speech music special effects mood-setting background sounds etc. The power of sound.

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Sound technology

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  1. Sound technology

  2. Basics of Sound • Sound is perhaps the most sensuous element of multimedia • Types of sound in multimedia • speech • music • special effects • mood-setting background sounds • etc

  3. The power of sound Although sound is rarely the main content in a multimedia production, remember that • Sound can make the difference between an ordinary multimedia presentation and a professionally spectacular one • Misuse of sound can wreck your project

  4. Sound in Multimedia • To use sound in multimedia you will not need special knowledge about harmonics, intervals, sine waves or notation • However, you should know the following: • How to make sounds • How to record and edit sounds on your computer • How to incorporate sounds into your multimedia work

  5. Digital audio • Digital audio means digitized sound • The source can be whatever, natural or prerecorded • Digitized sound is sampled sound: every nth fraction of a second, a sample of sound is stored as digital information (bits and bytes)

  6. Digital audio • Sampling rate: how often a sample is taken • Sample size: the amount of information that is stored about each sample • Typical sampling frequencies are 44,1 kHz, 22,05 kHz and 11,025 kHz • Sample sizes are either 8 bits or 16 bits

  7. Editing digital recordings • Trimming: removingdead air and blankspace • Splicing and assembly: remove the extraneousnoises and assemblelongerrecordingsfrommanyshorterones • Volume adustments: provide a consistentvolumelevel • Formatconversion: convertyourfile to a properformat • Resamplingordownsampling: ifusinglowerrates and resolutions, but 16-bit samplingrate (to save disk space)

  8. Editing digital recordings • Fade-ins and fade-outs: to gradually fade-in or –out if needed • Equalization: modify recording’s frequency content to sound brighter or darker • Time stretching: alter the length without changing the pitch • Digital Signal Processing (DSP) (reverberation, multitab delay, chorus etc) • Reversing sounds

  9. Audio file formats • There are dozens of them, created for different purposes over the years • Nowadays the most used digital audio formats are mp3 (computers, portable mp3 players, some DVD players), wma (Windows-only audio format) and rm/ram (RealAudio format). • Other formats: .aiff, .mod, .snd, .mid, .wav

  10. Adding sound to your multimedia project • Decide what kind of sound is needed and where you’ll use them • Acquire source material • Edit the sounds to fit your project • Test the sounds to be sure they are timed properly

  11. Stereo recording

  12. Dynamicmicrophone

  13. Capacitormicrophone

  14. High sound pressurepossible Sensitive, lowsounds Phantompower General microphone Attenuateshandlingsounds Sensitive to handlingsounds Effects, speech, music Interview, song, speech, percussions, music

  15. Sphere Heart, cardioidShotgunEight

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