Freq 51
Real-time spectrum analysis and spectrogram generation for acoustic signals on DOS and Linux.
Description
Demonstrates Freq51 and Specgrm2, two analysis programs from the Biomedical Ultrasonics Laboratory at the University of Michigan, available for DOS or Linux. The Spectrum Analyser (Freq51) provides power spectrum levels as a function of frequency, configurable for absolute values (e.g., dB re 1 volt) with sound card calibration. Spectrogram (Specgrm2) generates a real-time, full-screen spectrogram (sonagram) with various color options. These programs analyze incoming signals in real time, not stored files, and offer extensive settings for sampling rate, FFT points, and averaging time, making them highly versatile for acoustic analysis.
The DOS version of Freq51 and Specgrm2 can operate under Windows 95, requiring users to configure sound card switches via a text file. The resource also briefly mentions other acoustic analysis software like Gianni Pavan's DOS-based bioacoustic tools, Gram by R.S. Horne for Windows, SASLab (Light and Pro versions), Cool Edit, and GoldWave, providing a comparative overview of available tools for real-time and file-based spectral analysis and waveform manipulation.