Audio Frequency Signal Generator

Uses your PC sound card to create audio frequencies in the range 100 to 15000 Hz.

Tone Generator



DFasma ~ Compare Audio Files In Time & Frequency

DFasma is free open-source software which is used to compare audio files in time and frequency. The comparison is first visual, using wavforms and spectra. It is also possible to listen to time-frequency segments in order to allow perceptual comparison. It is basically dedicated to analysis. Even though there are basic functionalities to align the signals in time and amplitude, this software does not aim to be an audio editor.

dfasman - ss1.4_2comparison


  • Can load about 25 different audio formats (thanks to libsndfile or libsox).
  • Shows spectrogram, amplitude, phase spectra and group delay.
  • Can play a filtered sound given a selected frequency band.
  • Rectification of the spectrogram tilt (cepstral lifting).
  • Can create and edit segmentation files.
  • Can create and edit fundamental frequency (F0) files (thanks to REAPER).
  • Runs under Linux, Mac OSX and Windows.


Baudline ~ Visual Signal Analyzer

Baudline is a time-frequency browser designed for scientific visualization of the spectral domain. Signal analysis is performed by Fourier, correlation, and raster transforms that create colorful spectrograms with vibrant detail. Conduct test and measurement experiments with the built in function generator, or play back audio files with a multitude of effects and filters. The baudline signal analyzer combines fast digital signal processing, versatile high speed displays, and continuous capture tools for hunting down and studying elusive signal characteristics.

Explore, Analyze, and Discover.


Linux / MacOS / Unix


Baudline Mystery Signal Of The Month

Every month a new mystery signal is posted. Can you identify it?

Monthly Mystery Signal


Tau Analyzer ~ Audio Source Verification

Tau Analyzer is a free program, which can help you to distinguish with reasonable accuracy the original studio-based CDs from poor quality fakes, that have been “reconstructed” using a lossy audio source, such as mp3. Using this program you can check the authenticity of your purchased or borrowed music CDs.

Tau Analyzer features an intuitive user interface, allowing users to work directly with audio CDs, and has some additional functions such as spectrum and frequency analyzers, ATIP and ISRC data readers, etc.


Downloads ~ VirusTotal


Spectro ~ Audio File Analyzer

Spectro is a freeware audio file analyzer for Windows. Currently capable of reading FLAC, APE, MP3 and WAV files. Spectro lets you view vital data about compressed audio files and creates a spectrogram of the wave data. This allows you to quickly and easily spot quality issues with a file and also look for transcodes.




foo_verifier ~ Foobar Audio File Verifier

Checks specified media files for decoding errors. Note that with most formats, its accuracy is limited to detecting errors that abort the decoding process.


After installing this Foobar plugin, you’ll have two new menu choices under the right mouse click context menu: Utilities > Verify integrity and Utilities > Verify album with Accuraterip

It’s also possible to see more information if you go to File > Preferences > Advanced > Tools > File Integrity Verifier and enable Verbose AccurateRip Output