Wildlife Acoustics Bloggers

Ian Agranat

Changes to the Wildlife Acoustics Product Lineup in 2016

Changes to the Wildlife Acoustics Product Lineup in 2016

At Wildlife Acoustics, our mission is to continually develop new and better products – while delivering support and service for the products you’ve purchased from us over the years. Toward that mission, this blog post provides an update on the future availability of products you may own.

SM2+ and SM2BAT+ recorders and accessories will continue to be sold through 2016 and then will not be available. If you anticipate needing SM2+ or SM2BAT+ recorders in 2016, please contact us for availability as these will only be built as demand warrants. We will continue to honor warranties, and service these products for years to come. Please consider the SM4 or the SM4BAT as superior alternatives.

If you need to create time-synchronized recordings for localization and/or produce a schedule that does very different things on different days, the SM3 is the recorder of choice. And if you need to capture any combination of birds or other wildlife on a second channel, SM3BAT is the way to go.

Explaining Maximum Likelihood Estimators (MLE) and P-values used in Kaleidoscope

The U.S. Fish & Wildlife Service Indiana Bat Summer Survey Guidance describes the use of approved software programs. As part of their software testing criteria:

As species identifications are never perfect, all analysis programs must utilize a maximum-likelihood estimator approach to determine species presence at the site rather than relying on a single sequence. Post-hoc maximum-likelihood estimator p-values will be used to determine acceptance thresholds for final identification determination. The maximum-likelihood estimator used by Kaleidoscope Pro is based on a 2002 paper by Britzke, Murray, Heywood, and Robbins "Acoustic Identification".

The method described takes two inputs. First, there are the classification results e.g. How many detections of each bat did the classifier find? Second, there is the confusion matrix representing the known error rates across all the classifiers. For example, 70% of MYLU calls are correctly classified as MYLU while 3% of MYLU calls are misclassified as MYSO, etc. The maximum likelihood estimator determines what the most likely distribution of different species are that would result in the observed classifications given the classifier error rate. Then, to calculate P-values, a given species is clamped as absent and the most likely distribution is recalculated. The ratio of the clamped likelihood divided by the original likelihood is the P-value.

Wildlife Acoustics contributes technology as Open Source!

Update March 31, 2017:

In order to offer more flexibility from potential users of our meta data and WAC reader, we now use the MIT open software license (instead of GNU GPLv3). We have also added some additional meta data tags. The latest can be found at wa_meta-1.1.zip and wac2wavcmd-1.1.zip.

Dear customers, developers, and yes, even our competitors,

I have decided to open up two of our proprietary standards by contributing them as Open Source to the world community.

First, our proprietary WAC file format.

As some of you know, our recorders (including SM1, SM2, SM2+, SM2BAT192x2, SM2BAT384, SM2BAT+, EM3 and EM3+) are all capable of recording in either standard WAV format or our proprietary compressed WAC fomat.

Wildlife Acoustics is proud to support wildlife conservation efforts

Merlin Tuttle's Bat Conservation Orginization for Bat Conservation Bat Conservation International Bat Conservation Trust Wildlife Habitat Counsil