Tag Archives: behindtheveil

Digitization Details: Re-Formatting Audio Cassettes

Cassette
A real live audio cassette!

The 310 oral histories that comprise the newly published additions to the Behind the Veil digital collection were originally recorded in the 1990’s to the now (nearly) obsolete compact cassette format—what were commonly called “tapes”.  The beauty of the compact cassette format was that it was small and portable (especially compared to the earlier reel-to-reel tape format), relatively durable due to its hard plastic outer shell, and most of all—could easily be recorded to at home by non-professional users.  This made it perfect for oral historians who needed to be able to record interviews in the field at low cost with minimal hassle.  

Unfortunately, the compact cassette format hasn’t aged particularly well.  Due to cheap materials, poor storage conditions, and normal mechanical wear and tear, many of these tapes are already borderline unplayable a short 40 years after their first introduction.  This introduces a number of challenges to our process of converting the audio information on the tapes into a digital file format that can easily be accessed online by patrons.  I won’t exhaustively detail our digitization process here, but only touch on a few issues and how we dealt with them.

Inspecting a tape
Our fearless audio digitization expert carefully inspects a tapes.

Physical degradation and damage to tapes: We visually inspected each tape prior to digitization.  Any that were visibly broken or had twisted or jammed tape were rehoused in new outer shells.  At least with this collection, rehousing allowed us to successfully play back all of the tapes.

Poor quality of original recordings: We also did a brief audio inspection of each tape before digitization.  This allowed us to identify issues with audio quality.  We found that the interviews were done in a wide variety of locations, often with background traffic, television, appliance and conversation noise bleeding into the recording.  There was no easy fix for this, as these issues are inherent in the recording.  Our solution was to provide the best possible playback on a high-quality cassette deck, a direct and balanced signal path, and high quality analog-to-digital conversion at the preservation standard of 24 bits, 96.1 kHz.  This ensured that the digital copy faithfully reproduced the audio material on the cassette, warts and all.

Other errors in original recordings: There were some issues in the original recordings that we opted to fix via digital editing or processing in our files for patron use (while retaining the unaltered preservation files).

  • In cases where there was a significant gap of silence in the middle of a tape, we edited out the silence for continuity’s sake.
  • In cases where there were loud and abrasive clicks, pops, or microphone noise at the beginning or end of a tape side, we edited out these noises.
  • Several tapes were apparently recorded at the wrong speed, resulting in a “chipmunk voice” effect.  I used a Speed/Pitch function in our audio capture software to electronically slow these files down so that they play back intelligibly and as intended.
deck
Audio digitization deck

Another challenge, common to all time-based analog media, is the cassette tape’s “real-time” nature.  Unlike a digital file that can be copied nearly instantaneously, a 90-minute cassette tape actually takes 90 minutes to make a digital copy.  Currently we run two cassette decks simultaneously, allowing us to double our throughput.

As you can see, audio cassette digitization is more than just a matter of pressing “play”!

–post written by Zeke Graves

Still want to learn more about the Behind the Veil collection of oral histories?  Check out coverage of the collection over at Rubenstein Library blog, The Devil’s Tale.

 

Announcing 310 Newly Digitized Behind the Veil Interviews and a New Blog!

Duke Digital Collections is pleased to announce that we have published 310 newly digitized interviews in the Behind the Veil: Documenting African-American Life in the Jim Crow South digital collection!  The new interviews are specifically focussed on North Carolina residents.  Although several regions are represented, many interviews focus on the Charlotte, Durham and Enfield regions of the state.

Visit the Behind the Veil Digital Collection

The North Carolina recordings were all digitized as part of the Triangle Research Libraries Network’s project “Content, Context and Capacity: A Collaborative Large-Scale Digitization Project on the Long Civil Rights Movement in North Carolina.”  Publishing these recordings concludes this multi-year endeavor, which digitized collections from UNC Chapel Hill, NC Central University and NC State’s special collections holdings as well as Duke.

Prior to publishing the new NC recordings the Behind the Veil digital collection, contained 100 recordings.  Although we were able to build on the existing collection without developing new technology we essentially QUADRUPLED the number of interviews available online!!    The digital collection was created by digitizing the original audio cassettes and scanning any existing transcripts.   The entire collection (over 1,200 interviews on audio cassettes) is available for research at the John Hope Franklin Center for African and African American History and Culture in the David M. Rubenstein Rare Book & Manuscript Library.  Visit the Devil’s Tale (the David M. Rubenstein Rare Book & Manuscript Library blog) for more details.

Speaking of blogs, you are looking at the brand new blog of Duke’s Digital Projects and Production Services Department.  Visit Bitstreams to learn more about all the exciting and innovative digital projects at Duke University Libraries!