SLIDE 1 Audio Recording Tips & Guidelines | © 2009 Knowbase Networks AUDIO RECORDING TIPS &...
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Transcript of SLIDE 1 Audio Recording Tips & Guidelines | © 2009 Knowbase Networks AUDIO RECORDING TIPS &...
SLIDE 1
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
AUDIO RECORDING TIPS & GUIDELINES
LESSON ONE:
An Introduction
to Digital Audio Creation
SLIDE 2
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Create Voice Script
• Record Outside of PowerPoint
• Create a Voice Script by:– Selecting “File>Print”– Print What: “Notes”
• Record Single File for Each Slide
• Name Consistently:– Main Slides: slide1.mp3, slide2.mp3, etc.
– Interactive: slide2.mp3, slide2_a.mp3, slide2_b.mp3, etc.
SLIDE 3
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Great Voice, Great Learning
SLIDE 4
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Methods of Adding Audio
SLIDE 5
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Selecting a Microphone
• Use Sound-Proof Environment
• Commercial Quality Microphone
• Avoid Built-In Microphones
SLIDE 6
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Selecting a Microphone
• Microphone Formats:– Dynamic – Expensive and Fragile– Condenser – Cheap and Durable
• Purchase a Condenser Mic
SLIDE 7
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Selecting a Microphone
• Sound Pressure Level – SPL
• Measured in “dB SPL”
• Force Applied to Air Particles
• Highest Closer to Your Mouth
• Standard Conversation: 60 dB SPL
SLIDE 8
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Selecting a Microphone
• Sensitivity Rating Varies by Manufacturer
• Directly Related to Microphone’s Output
• High Sensitivity = Quiet Sounds
• Ratings Closest to Zero (0) Are More Sensitive
• Adequate Level: -50 dB
SLIDE 9
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Selecting a Microphone
SLIDE 10
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Selecting a Microphone
SLIDE 11
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Words of Caution
• Position Headset Mics Below Your Mouth
• Keep Mouth Consistent Distance from Stand-Mounted Mics
• Do Not Hold Mics While Recording
SLIDE 12
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Audio File Formats
• Two Audio Formats:– WAV– MP3
• Camtasia Works With Either• PowerPoint Handles Each
Differently:– WAV – Can Be Embedded in PPT– MP3 – Can Be Linked in PPT
• Work with MP3 When Possible
SLIDE 13
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Audio File Formats
• MP3 Minimum Settings:– 32 kbps Bit Rate– 44 kHz Sample Rate– Mono Channel– 16-bit Resolution– 22 kHz Bandwidth
• WAV Minimum Settings:– 44 kHz Sample Rate– Mono Channel– 16-bit Resolution
SLIDE 14
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Audio Software
• Windows Recorder - Free with most version of Microsoft Windows. Access via your Start Menu>Accessories. Will only record WAV files.
• Audacity - Open source (free license) software. Please note that you will also need to install the LAME Encoder to export as MP3. Access both at http://audacity.sourceforge.net/
• AudioEdit Deluxe - Priced at about $25. http://audioedit.mystikmedia.com/
• Adobe Sound Booth - Priced at about $200. Access athttp://www.adobe.com/products/soundbooth/
• Adobe Audition - Priced at about $350. Access athttp://www.adobe.com/products/audition/
SLIDE 15
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Audio Bit Rate
• Amount of Data Processed In Specified Amount of Time
• Measured in kbps (kilobytes per second)
• 32 kbps Is Sufficient for Final File
• 128 kbps Recommend for Files to Be Edited or Compressed Later
SLIDE 16
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Audio Sample Rate
• Sample Rate Represents the Rate Each Audio Input Is Recorded to Disk
• Measured in kHz (thousand cycles per second)
• CD Quality: 44 kHz
• Lower, But Adequate Quality: 22 kHz
SLIDE 17
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Audio Channel
SLIDE 18
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Audio Bandwidth
• Frequency Range for Accuracy of Sound
• 22 kHz Is Adequate
SLIDE 19
Audio Recording Tips & Guidelines | © 2009 Knowbase Networks
Conclusion