Baudline - Free signal & spectrum analyzer

Baudline – Free signal & spectrum 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. Available on Linux, FreeBSD, Mac OS X, or Solaris operating system.

  • Spectrum Analyzer
  • Spectrogram time / frequency browsing
  • Digital Storage Oscilloscope (DSO)
  • Scientific visualization
  • Data Acquisition (DAQ)
  • Continuous data logging
  • Device under test (DUT) and measurement
  • Environmental analysis
  • Signal analysis and quality monitoring
  • Audio file visual browsing
  • Audio file playback
  • Function Generator
  • FFT Analyzer
  • Weak Signal


  • 192 kHz real-time bandwidth
  • 96 dB dynamic range
  • Real or Quadrature input
  • Multiple sound card support
  • JACK Audio Connection Kit sound server support
  • Input Digital Down Converter (tuner)
  • Configurable input channels that can perform various DSP operations
  • Fourier, Correlation, Impulse Response, Transfer Function, and Raster transforms
  • Channel Equalization
  • Frequency, time, amplitude, and sample probability distribution analysis
  • Drift Integration “de-chirping”
  • High speed displays
  • Test signal generation


Audio player

  • looping
  • speed control with multirate resampling
  • pitch scaling
  • heterodyning (frequency shifting)
  • 2D matrix surround panning
  • notch, high, and low pass filters
  • digital gain boost

File loading

  • file formats: .wav, .aiff, .au, .al, .snd, .voc, .rmd, .pvf, .mp3, ID3, .ogg, .gsm, .sah, .fna, raw, .avi, .mov
  • channels: mono, stereo, … up to 9 channels
  • data formats: ASCII decimal, A-law, u-law, 1-bit (msb & lsb), 8-bit (signed & unsigned), 16/24/32-bit integer (little & big endian), float, double
  • compression

lossless suffixes: .gz, .bz2, .Z, .zip, .flac
codecs: ADPCM, GSM, MPEG, Ogg Vorbis


  • peaks: primary, secondary, delta (Hz dB PSD)
  • fundamental: (Hz dB PSD), auto drift rate, chromatic, periodicity, RPM
  • distortion: SNR, THD, SINAD, ENOB, SFDR
  • power: full, select, noise ratio (dB PSD)
  • system: clips, delta selected, frequency range, cursor time, UTC time


  • Linux, FreeBSD, Mac OS X, or Solaris operating system
  • x86, x86_64, PPC, S/390, or SPARC CPU architecture
  • X11 server display


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