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Towards the automatic acoustical avian monitoring system

Wielgat R., Król D., Potempa T., Kozioł P., Lisowska-Lis A.

Tarnowskie Colloquia Naukowe. Nauki Techniczne i Ścisłe

2017

T. 4, nr 3

17--38

One of the crucial aspects of the environmental protection is continuous monitoring of environment. Specific aspect is estimation of the bird species population. It is particularly important for bird species being in danger of extinction. Avian monitoring programs are time and money consuming actions which usually base on terrain expeditions. Certain remedy for this can be automatic acoustical avian monitoring system, described in the paper. Main components of the designed system are: digital audio recorder for bird voices acquisition, computer program automatically recognizing bird species by its signals emitted (voices or others) and object-relational database accessed via the Internet. Optional system components can be: digital camera and camcorder, bird attracting device, wireless data transmission module, power supply with solar panel, portable weather station. The system records bird voices and sends the recordings to the database. Recorded bird voices can be also provoked by the attracting device. Application of wireless data transmission module and power supply with solar panel allows long term operation of digital sound recorder in a hard accessible terrain. Recorded bird voices are analysed by the computer program and labelled with the automatically recognized bird species. Recognition accuracy of the program can be optionally enhanced by an expert system. Besides of labelled sound recordings, database can store also many other information like: photos and films accompanying recorded bird voices/ sounds, information about localization of observation/ recordings (GPS position, description of a place of an observation), information about bird features and behaviour, meteorological information, etc. Database on the base of geographical/ geological digital maps can generate actual maps of bird population (presence, number of individuals of each species). Moreover data-base can trigger alerts in case of rapidly decreasing bird population. It is also possible to obtain new knowledge about bird species with data mining methods. The paper presents collected data on observed bird species (audio recordings, photos and films) as well as results of experiments testing particular components of the automatic acoustical avian monitoring system.

HFCC based recognition of bird species

Wielgat R., Zieliński T. P., Potempa T., Lisowska-Lis A., Król D.

Elektronika : konstrukcje, technologie, zastosowania

2008

Vol. 49, nr 4

90-94

Results from preliminary research on recognition of Polish birds' species are presented in the paper. Bird voices were recorded in a highly noised municipal environment. High 96 kHz sampling frequency has been used. As a feature set standard mel-frequency cepstral coefficients (MFCC) and recently proposed human-factor cepstral coefficients (HFCC) parameters were selected. Superior performance of the HFCC features over MFCC ones has been observed. Proper limiting of the maximal frequency during HFCC feature extraction results in increasing accuracy of birds' species recognition. Good initial results are very promising for practical application of the methods described in the paper in monitoring of protected birds' area.

W artykule zaprezentowano wyniki wstępnych badań dotyczących rozpoznawania głosów ptaków. Nagrania cyfrowe ptaków dokonano z częstotliwością próbkowania 96 kHz w zaszumionym środowisku miejskim. Jako cech użyto współczynników mel-cepstralnych (MFCC) oraz ostatnio zaproponowanych współczynników human-cepstralnych (HFCC). Zaobserwowano większą skuteczność rozpoznawania, prowadzonego z użyciem tych drugich. Pokazano, że odpowiednie ograniczenie maksymalnej częstotliwości podczas wyznaczania współczynników HFCC prowadzi do podniesienia efektywności rozpoznawania. Uzyskane obiecujące wyniki są dobrym prognostykiem do planowanego, praktycznego zastosowania opisanych metod do monitorowania ostoi ptaków.