Avisoft-SASLab Pro, version 3.81 (July 2000)

Real-time spectrogram display improved: overlap, y-scale enlargement, down-sampling for low frequency signal analysis, recording level display, overload flag, unlimited streaming into WAV file
Spectrum level scaling for power spectrum display to the One-dimensional Transformation menu added
Zero-crossing analysis option to the One-dimensional Transformation menu added
New “File”/”Shred into numbered files” command for cutting of long sound files.
New “Tools”/”Zoom out time axis” command for better navigation in long and high-resolution spectrograms.

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