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Multimedia Authoring I MULT 109 Audio -- Part 1 Fall, 2002 Sound Something vibrates in the air creating waves of pressure on your eardrums that your brain interprets as sound. Sound pressure measured in decibels , dB. 0 dB - Threshold of hearing 10 dB - Rustling leaves 20 dB - Whisper

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Multimedia Authoring I

MULT 109

Audio -- Part 1

Fall, 2002


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Sound

Something vibrates in the air creating waves of pressure on your eardrums that your brain interprets as sound.

Sound pressure measured in decibels, dB.

0 dB - Threshold of hearing

10 dB - Rustling leaves

20 dB - Whisper

60 dB - Conversation

  • 110 dB - Rock concert

  • 130 dB - Threshold of pain

  • 160 dB - Instant perforation of eardrum


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Sonic Elements

Audio Types:

  • Music

  • Voice Over

  • Dialog

  • Sound Effects


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Audio Uses:

Alert

Information

Mood

Sonic Elements


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Digital vs. Analog

Wave Forms-

Analog = continuous

Digital = discrete

To convert from analog to digital: sample -

Look at amplitude at regular intervals

Convert to a number

Use number to play back the sound.


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Digital Audio

  • Sampling 1Hz=1 Hertz = 1 cycle per second

    • Sample rate

      • Telephone Quality 11 KHz, 8 bit, mono

      • Radio Quality 22 KHz, 8bit, mono

      • CD Quality 44 KHz, 16 bit, stereo

    • As sample rate increases ...

      • Quality increases

      • File size increases

  • Fundamental Problem of Multimedia:

    • Balance file size with asset quality


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Production Values

Sound Studio

Professional Voices

Ambiance, Decay, Echo

Plan using the Storyboard

Get it all in one studio session

Professional Audio Editor


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Where to Find Audio Files

  • C:\Windows\Media

  • CDs and cassette tapes

  • Web Sites

  • Make Your Own: Sound Recorder

    Use the presentation “Sound Advice” to create your own sounds.


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Audio on Your Computer

  • Find a sound that suits your needs.

  • On your computer, go to Start … Search … *.wav Double click to hear it.

  • Save it on your disk:

  • Right click on the name, choose Send To …

  • A: (if you are using a 3.5) or D: (if you are using a Zip disk)


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Placing Sound into a Director Movie

  • Import Sound into Director: File … Import

  • Drag it from the Internal Cast window onto the stage or drag it directly into the sound channel of the score.

  • Adjust number of frames (28 frames by default)


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Adjust Length of Sound

  • Dragging the end of the of the cast member’s score channel,

    or

  • Changing the frame numbersin the Property Inspectorwindow. (Make sure thesound sprite is selected.)


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Lab 08: Audio

Choose three of the following audio elements and incorporate them into a Director presentation with appropriate citations.

Create an audio file using Sound Recorder and your microphone.

Save a sound file from a web site.

Save a sound file from a CD.

Save a sound file from a cassette tape.

Save a sonic event from C:\WINNT\Media


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