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Before Entering This Module
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Copy File | Description | File Type |
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Preservation Master | The preservation master is a file that will be saved in the lossless format of WAV. It is as close a copy of the original recording as possible. It will have a checksum embedded, along with other metadata. It will be accessed only when the access master has become corrupted or lost. | WAV |
Access Master | The access master is also a high quality, lossless format of WAV. Improvement to sound quality, normalization, or removal of silence can be done to the access master or at the preservation master level. | WAV |
Access Copy | The access copy is created from your access master and is a file that is most easily shared and uploaded to websites or other platforms. In addition noise reduction and other effects can be added to the access copy for ease of listening. | MP3 |
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You will be using BWF MetaEdit to embed MD5 checksums. These are a unique set of 32 numbers that get added at the beginning of the audio file. If there is a change to the data in the file then it will generate a new checksum, and you will be able to see that a change was made using BWF MetaEdit. |
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Removing or trimming silence is done primarily to reduce the file size of recordings. The removal of silence should be consistently applied to all media that you digitize if you decide to make this edit. If you decide to trim silence on the preservation master, you should also trim the silence on the access master. However, if you only trim the silence on the access master, trimming it on the preservation master is optional.
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Normalization is a function performed over sections of your recording to even out and reduce any spikes in the waveform. These spikes are also known as 'transients' or 'transient bursts'. If the spikes exceed the sample rate of your recording, the audio will be clipped. Normalization applies a level gain amount to an audio recording to make the waveform more consistent. It is recommended that you normalize only the access master. The preservation master should remain as close to the original recording as possible, and normalization will observably change your recording.
In this module, there are videos and knowledge checkpoint exercises to acquaint you with these processes and assess your understanding of how they are applied to your files.
If you are interested in other methods of editing audio quality, you can go through this related article and its tutorials, located on the FirstVoices Knowledge Base: Edit audio quality in Audacity
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When you stop recording in Audacity, the file will not automatically save. If you need to step away from your computer, you can 'save as' an audacity file using the 'save as' option under the File menu. You will still need to export the file to create WAVs and MP3s when you return to your workstation.
This module contains tutorials and step-by-step instructions to successfully export WAV and MP3 files from Audacity. There are also examples for naming your various copy files to identify which side of the cassette tape they might contain and the type of copy file they are.
Embedding in BWF MetaEdit
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Link to Interactive ModulePlease follow this link to take you to the interactive module: https://digi-training.s3.ca-central-1.amazonaws.com/lets-digitize/index.html |
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Link to Bonus ModuleCheck out our new module on VHS digitization, here: https://digi-training.s3.ca-central-1.amazonaws.com/vhs-digitization/index.html |
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Digitization has provided some resources for you to review on how to normalize transients in your audio and the process from beginning to end of creating your copy files. There is also a digitization log template supplied. This information is also downloadable and available within the module itself.
Editing Transients
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