Converting tapes and other fagile media to digital audio files is almost a trival matter today. But what format should be used for long term storage? What metadata should accompany the files? How can or should they be accessed?
The ResCarta Toolkit can help build a true audio archive. With Broadcast Wav format, Library of Congress audioMD and MODS metadata, checksum validation over time and an almost instant website to allow for discovery and access; the ResCarta Toolkit is your answer to organize your audio history.
Automatic Audio Transcription (AAT) is contolled by a single check box on the Data Conversion Tool. Under the covers the ResCarta Toolkit uses the open source SPHINX software from Carnegie Mellon University of Pittsburgh. This software converts digital audio to text much like printed text is converted to characters and words by Optical Character Recognition software (OCR). The ResCarta Toolkit currently supports English as the langauge output and uses the Wall Street Journal dictionary to provide more recognition of family names.
The Audio Transcription Editor (ATE) allows the automatically produced transcription to be corrected for final inclusion in your digital archive. Each word is stored within the Broadcast Wave formatted file along with its timecode so that word search in your audio files can be accomplished.
Broadcast Wave Format (BWF)
Broadcast Wave format or BWF is a standard format that can be created without royalty payments and has the featured needed to add required metadata. It is the format used for radio and television production.
The ResCarta Toolkit can create BWF format from common WAV formatted files. The Data Conversion Tool will embed metadata made by the Metadata Creation tool into the aXML chunk according to the Broadcast Wave Specifications. Transcription data created by ResCarta Toolkit's unique one click Automatic Audio Transcription (AAT) is stored within the BWF file along with the location of each word similar to the way Optical Character Recognition (OCR) data is stored in textural materials.
Files created by the ResCarta Toolkit can be validated using the BWF MetaEdit from Library of Congress and audio visual working group of the Federal Agencies Digitization Guidelines Initiative (FADGI)
Audio resolutions are currently supported up to 96khz 24bit Stereo by the Data Conversion Tool.
Fixity is a buzz word in today's digital world. ResCarta Toolkit has always created files with checksum validation for long term maintenance. At each step along the way the ResCarta Toolkit will generate a checksum. When the file has been added to your ResCarta archive it is ready to be validated by the Checksum Validation tool. This software tool will compare the original checksum to one it generates to see if any change has occurred since the time your digital object was created. It will notify you of any files where the checksums are not equal and allow you to replace the file from your alternate source. You did remember to create another copy of your archive, right? Remember lots of copies keeps stuff safe (LOCKS).
The Metadata Creation Tool (MCT) uses simple forms to collection and ouput Library of Congress METS/MODS/audioMD formatted XML files for each of your original WAV formatted audio files. The Data Conversion Tool will take your WAV formatted file and create a standard directory structure where it will store the audio chunk into a Broadcast Wave formatted (BWF) file. It will take the MODS data created by the MCT and embed that data into the aXML chunk of the BWF. If the Automatic Audio Transcription (AAT) checkbox was used or the Audio Transcription Editor (ATE) during production of your ResCarta archive, then the transcribed text will also be embedded into the BWF file.