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Removing overlaps on Audio recordings

  • Context
    • SB has a large collection of digitized radio broadcast data, approx. 350.000 hours
    • These recordings are split on chunks of 2 hours (the length of the original tapes) with small overlaps between files.
    •  
  • Preservation Issues
    • The digitization process creates files that overlap slightly at the ends.
    • To enhance user experience, SB wanted to eliminate the overlap so that the broadcast is a continuous show.
  • SCAPE solution (unique selling point)
    • The xCorrSound toolset allows us to detect  overlaps and easily cut the recording to make it a single file/show.
    • The tool can be applied in large scale (e.g. on hadoop).
  • Success Story Champion
    • Bolette Jurik (SB)
  • Positive words:

Used in production workflows

Precision in the overlap analysis

Automated process

Leads to Improved and optimized end user experience

Solves an otherwise unsolvable problem

Innovative thinking based on well-known cross correlation

(Independent of operating system)

Resource efficient

Open source - freely available

Command line tool - easy to install and integrate into a workflow

(see description http://wiki.opf-labs.org/display/TR/xcorrSound)

Changed names for tools in xcorrSound (check xcorrSound):

waveform-compare    -  the former 'migrationQA', is used to compare 2 files to see if they are 'enough alike'

overlap-analysis - Is used to find the overlap between 2 files - an overlap means that the exact same section is found at the end of the first file and the start of the next.

sound-match - is used to find a short sound section every time it appears in a longer sound section. For instance, a special news jingle before and after the newscast. Sound-match can find all the newscast in a radio recording by marking the jingles.

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