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Audition CS6 Essential Training
Illustration by John Hersey

Understanding bit depth


From:

Audition CS6 Essential Training

with Garrick Chow

Video: Understanding bit depth

Okay. So, when you're creating a new recording in Audition--again I'll choose File > New > Audio file. In addition to the sample rate--which we previously covered--you also need to select the bit depth of your recording. Notice we can choose from 8, 16, 24, or 32 float. The bit depth determines the dynamic range of your audio file. The more bits, the wider the range of volume you can have within each sample of your recording. Think back to the previous movie on sample rate. We likened the sample rate to a camera that takes thousands of images of a sound per second. For example, a sample rate of 44.1 Kilohertz takes 44,100 samples per second.
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  1. 1m 7s
    1. What is Audition?
      1m 7s
  2. 1m 55s
    1. Welcome
      54s
    2. Using the exercise files
      1m 1s
  3. 21m 6s
    1. Understanding the Audition interface
      8m 49s
    2. Setting up input and output
      4m 7s
    3. Setting essential preferences
      8m 10s
  4. 25m 3s
    1. Importing audio files
      6m 39s
    2. Extracting audio from a CD
      4m 6s
    3. Importing video files
      2m 21s
    4. Recording audio
      4m 50s
    5. Creating a multitrack session
      7m 7s
  5. 8m 8s
    1. Understanding frequency
      1m 50s
    2. Understanding amplitude
      1m 40s
    3. Understanding sample rate
      2m 34s
    4. Understanding bit depth
      2m 4s
  6. 37m 59s
    1. Understanding the Waveform Editor interface
      6m 2s
    2. Making selections
      6m 5s
    3. Adjusting the clip amplitude
      2m 49s
    4. Fading clips
      4m 5s
    5. Normalizing
      5m 17s
    6. Copying, cutting, and pasting
      7m 40s
    7. Undoing, redoing, and using the History panel
      4m 5s
    8. Generating silence
      1m 56s
  7. 24m 1s
    1. Using the Spectral Frequency Display
      2m 53s
    2. Using the selection tools
      7m 18s
    3. Using the Spot Healing Brush
      6m 34s
    4. Removing background noises
      7m 16s
  8. 46m 31s
    1. Understanding destructive vs. nondestructive effects
      12m 35s
    2. Applying compression
      9m 20s
    3. Understanding reverb vs. delay
      4m 44s
    4. Working with filters and EQ effects
      6m 46s
    5. Using special effects
      4m 26s
    6. Isolating vocals in a stereo track
      4m 27s
    7. Working with time and pitch effects
      4m 13s
  9. 1h 18m
    1. Creating a multitrack session
      6m 1s
    2. Recording and importing audio
      9m 42s
    3. Understanding the multitrack interface
      5m 20s
    4. Understanding the Mixer panel
      6m 13s
    5. Editing clips in Multitrack View
      9m 49s
    6. Grouping clips together
      2m 43s
    7. Creating bus groups
      7m 42s
    8. Routing and working with sends
      4m 7s
    9. Using automation
      12m 25s
    10. Pre-rendering tracks
      2m 19s
    11. Exporting the mix
      4m 13s
    12. Exporting the session
      3m 22s
    13. Burning the mix to a CD
      4m 45s
  10. 25m 17s
    1. Working with audio from video
      6m 23s
    2. Importing a sequence from Premiere Pro
      3m 59s
    3. Adding a soundtrack to a video
      3m 45s
    4. Exporting a session back to Premiere Pro
      3m 32s
    5. Using Automatic Speech Alignment
      7m 38s
  11. 9m 46s
    1. Understanding the interface
      6m 17s
    2. Using pan envelopes
      2m 44s
    3. Exporting a multichannel mix
      45s
  12. 52s
    1. Next steps
      52s

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Audition CS6 Essential Training
4h 40m Beginner May 06, 2012

Viewers: in countries Watching now:

Audition CS6 Essential Training demonstrates all of the major features of Adobe Audition and prepares sound editors to start enhancing and correcting audio—whether it's music, dialogue, or other sound effects. Author and musician Garrick Chow begins by covering how to import, record, and manage media files, from extracting audio and importing video, to creating a new multitrack session from scratch. The course then dives deep into editing, repairing, and cleaning up audio files, using the Waveform and Multitrack Editors, and the Spectral Frequency Display. It also covers how to use built-in effects, how to mix both stereo and surround audio tracks, and how to work with video projects from Premiere Pro.

Topics include:
  • Setting up the interface
  • Setting up inputs and outputs
  • Importing audio and video
  • Understanding audio terminology, such as frequency and amplitude
  • Adjusting clips in the Waveform Editor
  • Cleaning and repairing audio
  • Applying effects
  • Working with tracks in the Multitrack Editor and Mixer panel
  • Editing the soundtrack of video
  • Performing surround mixing
Subjects:
Audio + Music DAWs Mixing Video Audio for Video Music Editing Post Production
Software:
Audition
Author:
Garrick Chow

Understanding bit depth

Okay. So, when you're creating a new recording in Audition--again I'll choose File > New > Audio file. In addition to the sample rate--which we previously covered--you also need to select the bit depth of your recording. Notice we can choose from 8, 16, 24, or 32 float. The bit depth determines the dynamic range of your audio file. The more bits, the wider the range of volume you can have within each sample of your recording. Think back to the previous movie on sample rate. We likened the sample rate to a camera that takes thousands of images of a sound per second. For example, a sample rate of 44.1 Kilohertz takes 44,100 samples per second.

The amount of information stored in each one of those samples is determined by the bit depth. So, for example, a low bit depth like 8-bit resolution only allows for a dynamic range of 48 dB within a sample. That's not enough to accurately capture the dynamic range of most sounds. A 16-bit resolution, which is how most music CDs are encoded, allows for 96 dBs of dynamic range. 24 gives you 144 dB range, and 32 is the best at 192 decibels of dynamic range. So, the higher your bit depth, the more information or dynamic range you have to work with.

Higher bit depths also result in larger files, though. But unless you're working on an old computer with very little hard drive space to spare, you should always work at the highest bit depth possible, which is 32 float in this case. When you're done, you can always convert your file to a lower bit depth if you want to decrease the file size, or for example, burn a CD for which you'll have to drop your bit depth down to 16-bit. Now the reason it's labeled 32 float is because this isn't true 32-bit recording. 32-bit float is actually a 24-bit resolution recording with an additional 8 bits for headroom and dynamic range.

And currently there aren't any 32-bit soundcards or input/output devices for computers. The highest quality devices are still 24-bit, and Audition uses 32-bit float to get the optimum sound quality and dynamic range out of your 24-bit hardware. The bottom line, use 32-bit float for your recordings to get the best dynamic range. You can always convert it down later, but you'll never be able to get more quality out of a recording that was recorded at a lower bit rate.

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