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(Jun/Jul2015)

CO.BRA Training Workshop for Young Research
Team Members

Dr. Olaf Jahn, a CO.BRA core team research member, conducted a training workshop on the compilation of Caiman yacare signal free background libraries at the Institute of Biosciences, LETA, UFMT from June 23 – July 10. The participating new team members were introduced to identify and select soundscapes based on real-field audio recordings from CO.BRA´s Bioacoustics Research Project in the northern Pantanal. Following topics were covered during the nine-day workshop: (1) Acquisition of soundscapes with autonomous recording units (ARUs); (2) visualization of low frequency acoustic signals in spectrograms; (3) examples and characteristics of sound types emitted by the target species, including infrasonic vibrations; (4) screening of original soundscapes recorded at oxbow lakes for the presence of Caiman yacare sounds; (5) sorting of the screened files according to the number and intensity of Caiman yacare signals; (6) renaming of target signal free background files via a batch process; and (7) uploading of background files to the FTP server of the project. With such detailed technical expertice the new CO.BRA team members proceeded to compile background libraries required for the developement of an automated acoustic Caiman yacare detector.

Photo: Dr. Olaf Jahn (center, back), explaining to workshop participants the technical details of acoustic signals in spectrograms.

 

(Mar/2014)

CO.BRA Workshop "Compilation of Animal Sound Corpora"

UFMT, Institute of Bioscience, IB, & Institute of Computation, IC, Cuiaba, March 20 and 26, 2014.
Conductor: Olaf Jahn, PhD. Invited presentations by Allan Goncalves de Oliveira, MSc, and Thiago Meirelles Ventura, MSc, IC.
Participants: Researchers and students from the IB "Anuran Research Group" of Prof. Strüssmann and Filipe de Deus, MSc, CO.BRA grantee (Science without Borders´ Program).

The two-day workshop focused on the challenges of compiling frog sound corpora, covering the following topics: (1) Acquisition of audio recordings with autonomous recording units (ARUs), (2) File-naming rules for original and derived audio recordings, (3) Selection of relevant audio signals (snippets) in complex structured sound recordings (soundscapes), (4) Compilation of reference libraries of identified anuran sounds, (5) Establishment of training libraries of clean target signals, (6) Compilation of validation corpora for detector performance assessment.
Practical exercises were based on real-field audio recordings from CO.BRA´s Bioacoustics Research Project in the northern Pantanal. After the workshop several participants proceeded to collaborate in snippet selection tasks and the compilation of identified anuran sound libraries.

 

http://cobra.ic.ufmt.br/documents/10437/11867/DSCN0217_copyright_FilipeDeDeus_use.jpg/b1681d1a-534f-424c-9a05-37429fd3fcef?t=1401041224666

Photo: Workshop participants (left to right): Jessica Rhaiza Mudrek, BSc; Andre Pansonato, PhD; Olaf Jahn, PhD, workshop conductor; Taina Figueras Dorado Rodrigues, MSc, concealed; Prof. Christine Strüssmann, PhD.  Photo by Filipe de Deus.