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Analysis of the bat calls may be required in some situations e.g. in order to positively identify a certain species. The software BatSound is an efficient, high-performance tool for various types of sound analysis. It is suitable for sound analysis in general, but also includes a number of features particularly useful to analyze bat calls recorded from a bat detector or recorded directly with a D500X or D1000X ultrasound detector.
BatSound uses any Windows compatible sound card for sound input and output.
BatSound supports sound formats up to 32 bits with one or two channels (mono/stereo) and sampling frequencies up to 192 kHz (for recording and playback, files of any sampling frequency can be opened and analyzed). The common WAV format is used to store files. It is also possible to open sound files with other formats such as mp3 and wma if the corresponding codecs have been installed on the computer.
Multiple windows with different sound files can be opened at the same time, facilitating comparison of signals and analysis results.
Printing and picture file export through Windows clipboard (BMP and WMF formats).
Wide range zoom function.
Optional time and frequency compensation of time expanded signals to show the original time and frequency.
Play Speed function to implement time expansion playback of high-speed sound files from D500X/D1000X detectors.
Open Next/Previous command makes it easy to scan through all files in a folder. Very useful for browsing files obtained through unattended recording.
Automatic parameter extraction feature, calculates max/min frequency, pulse duration etc.
Optional grid lines in most diagrams.
Clipboard export of analysis results.
In the Virtual Bat Detector mode, sound files of time expanded or high speed recorded sounds are replayed at the original speed, emulating a heterodyne bat detector. Perfect for learning how to identify bats using a heterodyne detector, for classroom demonstrations etc.
The Automatic Recording mode makes it possible to have the computer record sounds automatically. The desired threshold level is selected and the computer will start recording to a sound file as soon as the signal exceeds this level. Many parameters are available to fine-tune this mode, e.g. by setting limits for the minimum pulse length, total recording time, maximum number of pulses to record etc. Frequency-selective triggering is also available, to avoid recording undesired signals.
Windows, Windows XP, Windows Vista, Windows 7, Windows 8 and Windows 10 are registered trademarks of Microsoft Corporation.
BatSound is a registered trademark of Pettersson Elektronik AB.
The software CrossOver enables Windows applications to run on Linux and OS X operating systems. For a step-by-step guide on how to use BatSound on Linux/OS X with CrossOver, please see Dean Waters' blog.
The sound file editing functions include:
Cut, Copy, Paste, Insert silence, Reverse, Adjust volume, Filter and Undo edit.
Using these, it is possible to enhance the sound file in many ways, e.g. to remove undesired portions of a signal or to create a new sound file by cutting and pasting sound clips from other files.
The filter function enables frequency-selective editing of the sound file. Removing e.g. low-frequency noise from a selected portion of the sound file is an easy matter. The filter characteristics are chosen in the "Filter design dialog box", where it is also possible to study the frequency response of the designed filter before actually filtering the sound file.
The filter design parameters are:
|Filter characteristic:||Lowpass, Highpass, Bandpass, Bandstop|
|Filter type:||Butterworth, Chebyshev I, Elliptic, User defined|
|Cut-off frequencies:||User selected|
|Filter order:||2, 4, 6 or 8|
Real-time analysis mode with: Spectrogram/oscillogram
The spectrogram and/or oscillogram runs across the screen in real time, while the signal is simultaneously stored on the hard disk. Only the available hard disk space limits the recording length. After interrupting the real-time analysis, the entire sequence resides on the hard disk, immediately available for playback, further analysis or editing.
Sound file analysis mode with: Spectrogram/oscillogram
FFT sizes: 16, 32, 64, 128, 256, 512, 1024, 2048 samples.
Windows: Rectangular, Hamming, Hanning, Parzen, Cosine.
Versatile threshold, contrast and overlap adjustments to change appearance of spectrograms.
Different spectrogram color maps available, including "User defined":
FFT sizes: 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384 samples.
Windows: Rectangular, Hamming, Hanning, Parzen, Cosine.
Pulse Interval analysis
Displays the distribution of time intervals between pulses in a histogram.
Pulse Length analysis
Displays the distribution of pulse lengths in a histogram.
Pulse Characteristics analysis
The user selects the analysis criteria and the program automatically extracts many important signal parameters, such as:
In the Virtual Bat Detector mode, BatSound is used to replay the sound files (time expanded or recorded in the high-speed mode) from the hard disk as heard through a heterodyne bat detector. An on-screen tuning control is available to tune the Virtual Bat Detector to different frequencies. While the signal is being replayed, the spectrogram of the signal is displayed on the screen, making it easy to understand the connection between different sounds and their spectrograms.
This feature is very useful to learn to recognize the sounds of different bat species. The sounds can be repeated over and over again, to facilitate finding the specific characteristics of each species.