Multimedia: CS117 <ul><li>Lesson 9 </li></ul><ul><li>Sound </li></ul>
Lesson 9: Sound Understanding Sound <ul><li>Sound travels as waves at 750mph (at sea level) </li></ul><ul><li>Acoustics  i...
Lesson 9: Sound Multimedia System Sounds <ul><li>Most target computers have sounds ready to use </li></ul>
Lesson 9: Sound Multimedia System Sounds <ul><li>Macintosh and Windows systems have built-in sound recorders </li></ul>
Lesson 9: Sound MIDI Audio <ul><li>MIDI is a series of musical instructions </li></ul>Click to play
Lesson 9: Sound Digital Audio <ul><li>Digital audio is a representation of the original sound </li></ul><ul><li>Sampling r...
Lesson 9: Sound Preparing Digital Audio Mono:   sampling rate    duration of recording in seconds    (bit resolution   ...
Lesson 9: Sound Preparing Digital Audio <ul><li>Balance file size versus quality </li></ul><ul><li>Set recording levels </...
Lesson 9: Sound Making MIDI Audio <ul><li>Some musical talent </li></ul><ul><li>MIDI sequencer software </li></ul><ul><li>...
Lesson 9: Sound Audio File Formats <ul><li>AIFF </li></ul><ul><li>SND </li></ul><ul><li>Common Macintosh formats include: ...
Lesson 9: Sound Audio File Formats <ul><li>Any sound with a valid MIME-type may be found online </li></ul><ul><li>Sound fo...
Lesson 9: Sound Adding Sound to Multimedia <ul><li>Decide what kind of sound is needed </li></ul><ul><li>Determine when an...
Lesson 9: Sound Adding Sound to Multimedia <ul><li>Standard is ISO 10149,  a.k.a. the “Red Book Standard” </li></ul><ul><l...
Lesson 9: Sound Adding Sound to Multimedia <ul><li>Initially record on tape or other economical media </li></ul><ul><li>If...
Lesson 9: Sound Adding Sound to Multimedia <ul><li>Secure rights for all material you use </li></ul><ul><li>Look for colle...
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Sound PowerPoint

  1. 1. Multimedia: CS117 <ul><li>Lesson 9 </li></ul><ul><li>Sound </li></ul>
  2. 2. Lesson 9: Sound Understanding Sound <ul><li>Sound travels as waves at 750mph (at sea level) </li></ul><ul><li>Acoustics is the physics of sound </li></ul><ul><li>Sound pressure is measured in decibels (dB) </li></ul><ul><li>Too much sound can be detrimental </li></ul>
  3. 3. Lesson 9: Sound Multimedia System Sounds <ul><li>Most target computers have sounds ready to use </li></ul>
  4. 4. Lesson 9: Sound Multimedia System Sounds <ul><li>Macintosh and Windows systems have built-in sound recorders </li></ul>
  5. 5. Lesson 9: Sound MIDI Audio <ul><li>MIDI is a series of musical instructions </li></ul>Click to play
  6. 6. Lesson 9: Sound Digital Audio <ul><li>Digital audio is a representation of the original sound </li></ul><ul><li>Sampling rate is measured in kilohertz (kHz) </li></ul>Click to play
  7. 7. Lesson 9: Sound Preparing Digital Audio Mono: sampling rate  duration of recording in seconds  (bit resolution  8)  1 Stereo: sampling rate  duration of recording in seconds  (bit resolution  8)  2 <ul><li>Balance file size versus quality </li></ul>To calculate file size in bytes:
  8. 8. Lesson 9: Sound Preparing Digital Audio <ul><li>Balance file size versus quality </li></ul><ul><li>Set recording levels </li></ul><ul><li>Edit the recording </li></ul>
  9. 9. Lesson 9: Sound Making MIDI Audio <ul><li>Some musical talent </li></ul><ul><li>MIDI sequencer software </li></ul><ul><li>A sound synthesizer </li></ul><ul><li>Making MIDI audio requires: </li></ul><ul><li>MIDI can synthesize over 100 instruments </li></ul>
  10. 10. Lesson 9: Sound Audio File Formats <ul><li>AIFF </li></ul><ul><li>SND </li></ul><ul><li>Common Macintosh formats include: </li></ul><ul><li>WAV is the most common Windows format </li></ul><ul><li>MIDI is supported by both platforms </li></ul>
  11. 11. Lesson 9: Sound Audio File Formats <ul><li>Any sound with a valid MIME-type may be found online </li></ul><ul><li>Sound for the Web </li></ul><ul><li>Sound can be played online in two ways </li></ul><ul><li>Download the sound, then play it </li></ul><ul><li>Stream the sound </li></ul>
  12. 12. Lesson 9: Sound Adding Sound to Multimedia <ul><li>Decide what kind of sound is needed </li></ul><ul><li>Determine when and where to use the sound </li></ul><ul><li>Acquire source material </li></ul><ul><li>Edit the audio </li></ul><ul><li>Test </li></ul><ul><li>Before adding sound, you must: </li></ul>
  13. 13. Lesson 9: Sound Adding Sound to Multimedia <ul><li>Standard is ISO 10149, a.k.a. the “Red Book Standard” </li></ul><ul><li>Sample size is 16-bit </li></ul><ul><li>Sample rate is 44.1 kHz </li></ul><ul><li>11 seconds of audio uses 1.94 MB of space </li></ul><ul><li>CD-quality audio </li></ul>
  14. 14. Lesson 9: Sound Adding Sound to Multimedia <ul><li>Initially record on tape or other economical media </li></ul><ul><li>If CD quality sound is required, hire a professional </li></ul><ul><li>High quality audio can often be recorded from video tapes </li></ul><ul><li>Use a recorder with a good counter or timecode generator </li></ul><ul><li>Organize and back up material </li></ul><ul><li>Pay attention to timing </li></ul><ul><li>Test in a realistic environment </li></ul><ul><li>Production tips </li></ul>
  15. 15. Lesson 9: Sound Adding Sound to Multimedia <ul><li>Secure rights for all material you use </li></ul><ul><li>Look for collections of royalty-free audio </li></ul><ul><li>Copyright issues </li></ul>

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