xcorrSound

h2. Summary

| Purpose | {excerpt}The xcorrSound package compares sound waves using cross correlation.{excerpt} |
| Homepage \\ | None |
| Source Code Repository \\ | [https://github.com/openplanets/scape-xcorrsound] |
| License \\ | [GPL-2.0|http://www.gnu.org/licenses/gpl-2.0.html]\\ |
| Debian Package | [http://deb.openplanetsfoundation.org/pool/main/m/migration-qa/] (only the xcorrSound migrationQA (waveform-compare) tool) \\ |
| Samples \\ | [http://ia700308.us.archive.org/21/items/Radiators2008-09-19/|http://ia700308.us.archive.org/21/items/Radiators2008-09-19/] has a number of not too big wav files that can be used for testing |


h2. Description

The tools all make use of cross correlation, which can be computed through the Fourier transform.


h2. User Experiences

This tool was developed and used at The Danish State and University Library in the following scenarios.

h3. Overlap Scenario

The State and University Library in Denmark possesses a large amount of digital audio files which are radio broadcasts from DR (Danmarks (Danish) Radio). All radio broadcasts from DR in the period 1989 to 2005 have been digitised. The broadcasts were recorded on 2 hour tapes. In order not to loose any data, one tape was put in one recorder and a few minutes before it reached the end, another recorder was started with another tape. This yields two tapes with some overlap. All these tapes have now been digitized and the digitized dataset is 20Tbytes of audio files in 2 hour chunks with unknown overlaps; the library wishes to remove this overlap. The xcorrSound tool finds the overlap.

h3. Migration and QA Scenario

The waveform-compare tool is used in SCAPE Solution [SO4 Audio mp3 to wav Migration and QA Workflow|http://wiki.opf-labs.org/display/SP/SO4+Audio+mp3+to+wav+Migration+and+QA+Workflow].

h3. Sound Match and Sound Index Scenarios

*TBD*