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Multimedia Authoring I

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

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  1. Multimedia Authoring I MULT 109 Audio -- Part 1 Fall, 2002

  2. 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

  3. Sonic Elements Audio Types: • Music • Voice Over • Dialog • Sound Effects

  4. Audio Uses: Alert Information Mood Sonic Elements

  5. 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.

  6. 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

  7. Production Values Sound Studio Professional Voices Ambiance, Decay, Echo Plan using the Storyboard Get it all in one studio session Professional Audio Editor

  8. 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.

  9. 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)

  10. 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)

  11. 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.)

  12. 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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