Sound (Excerpts from Summer A/V Workshop)


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Sound (Excerpts from Summer A/V Workshop)

  1. 1. Audio / Video for Slidecasts & Podcasts Giving Life to Online Media July 24, 2010
  2. 2. The Signal Path
  3. 3. The Signal Path The Signal Path (or Chain) The steps the sound must pass through to be played to your viewers the sound source the microphone the connectors the mixing and routing the digital recorder the digital compression The Signal Path is only as strong as its weakest link photo credit: Paul Graham Raven on Flickr licensed CC-BY-NC-SA
  4. 4. Signal Path
  5. 5. The Sound Source
  6. 6. The Sound Source The Sound Source Best place to avoid poor sound quality Often the easiest overlooked The least expensive solution Listen first! photo credit: Maccio Capatonda on Flickr licensed CC-BY-NC-SA
  7. 7. The Sound Source Ambient Noise “The pervasive noise associated with a given environment, being usually a composite of sounds from sources both near and distant.”
  8. 8. The Sound Source We have an amazing amount of ability to mentally filter out ambient noise wind, traffic, refrigerator hum, light ballast buzz, computer fans, etc. As recording engineers we have to learn how to stop our filters and listen again photo credit: Barking Tree Frog by Brian Gratwicke on Flickr licensed CC-BY-NC
  9. 9. The Sound Source Ambient noise we can sometime filter out in post-production Typically when it is a consistent frequency It can be useful to record a few seconds of “silence” with each shot to capture a “reference sound level” This can be used later to help eliminate ambient noise, or to cover up sounds Professional recording engineers also record a reference tone photo credit: Barking Tree Frog by Brian Gratwicke on Flickr licensed CC-BY-NC
  10. 10. The Sound Source Problem: Excessive environmental ambient noise background, traffic, wind, flags Solutions: Different environment Different time of day Close curtains Remove hard furniture Soften walls or ceilings Reposition microphones photo credit: LakeWentworth on Flickr licensed CC-BY-NC
  11. 11. The Sound Source Problem: Excessive environmental transient noise dogs, sirens, aircraft, frogs Solutions: Be aware of transient changes and re-record Wait it out Different time of day Buy the landscaping crew an early lunch photo credit: Barking Tree Frog by Brian Gratwicke on Flickr licensed CC-BY-NC
  12. 12. The Sound Source Problem: Building and machinery noise HVAC, refrigerator, elevators, clocks, computer fans, light ballast hum Solutions: Different time of day Know where the HVAC controls are Run HVAC hard then turn off Muffle vents Turn off & unplug equipment and lights Signage “Quiet Please!” photo credit: RomulusNR on Flickr licensed CC-BY
  13. 13. The Sound Source Problem: Talent & crew noise fidgeting, clothing noise, mouth sounds Solutions: Train crew to be quiet Avoid walking to avoid both creaky floors and creaky squeaky shoes Avoid noisy cloth, in particular silk, rayon, corduroy, especially on talent Readily available water between takes & green apple slices to avoid mouth noise photo credit: Diamond Geezer on Flickr licensed CC-BY-NC-ND
  14. 14. The Sound Source Problem: Sound & video gear crackles, ground loops, camera noise, microphone pops, wind noise, phones Solutions: Mark and discard bad cables Use balanced gear (see upcoming slides) Don’t use camera microphone Be aware of microphone placement Use a zeppelin or windsock on mike Turn off or Airplane mode phones photo credit: RomulusNR on Flickr licensed CC-BY
  15. 15. The Sound Source Problem: Lost or bad sound microphone or recorder batteries dead, cable loose or unplugged, etc. Solutions: Double-check! Tape everything down Backup with Additional recorder “Plant” a digital recorder as a backup Use iPhone Movie★Slate to sync photo credit: tjmasiakowski on Flickr licensed CC-BY
  16. 16. The Sound Source Movie★Slate This iPhone / iPad app is a bit expensive ($19.95), but very useful Sync multiple audio sources If you keep volume of iPhone same, good reference tone Accurate time Good for making sure you have notes on all of your shots But remember turn on Airplane Mode! photo credit: PureBlend Software Movie★Slate
  17. 17. The Sound Source Reference Headphones Use your headphones – many problems you’ll not spot unless you use them Anything is better then nothing But if you buy a good pair, you want “flat response” photo credit: Dale Gibert Jarvis on Flickr licensed CC-BY-NC-SA
  18. 18. Questions? Feedback?