SoundMap Technical Specifications
Version 1.0
Time View
- Input File Data format
- SoundCheck Waveform
- Wave file (*.wav)
- TIM: MLSSA binary file format for time data
- Text files (documented format)
- Display of time waveform + zoom
- Analysis Parameters
- Choice of the transform: STFT, CSD, WV, Wavelet (see algorithms)
- Frequency resolution: Hz (STFT, CSD, WV) or 1/3…1/24 octave (Wavelet).
- Frequency resolution (in Hz)
- Time increment (in s)
- WV Smoothing size (in s)
- Automatic / manual setup
- Information
- Sampling frequency (Hz)
- Transform Overlap (%)
- Window/Wavelet duration (s).
- BT product (%)
- Analysis duration (s)
- Analysis completeness ( “Gap Free”):
- Number of spectra, lines/spectra, time-frequency pixels
- Bar-graphs for windows size, smoothing size and analysis duration
Multispectrum View
- Time-frequency intensity map with color coded levels and 2 side displays.
- Intensity Map (time-frequency-level)
- Color coded levels
- Unit = calibrated power spectral density in dB(ref. 1 U²/Hz)
- Choice of color scales: Rainbow, Fire, Sunset, Grey Scale…
- Choice of Dynamic Range
- 2D Max search.
- 2 cross-cursors (one absolute, one delta)
- Right Side Display= Frequency Display
- Global Energy Spectrum (U².s/Hz)
- Instantaneous spectrum (U²/Hz)= frequency slice at time location of cursor 1.
- Partial spectrum (U².s/Hz) between the 2 vertical cursors on the map
- Group Delay curve(s)
- 2 horizontal cursors coupled with the ones on the map.
- Bottom Display= Time Display
- Time wave, analyzed segment (U)
- Time slice (U²/Hz). The time slice is done at frequency location of cursor 1.
- Energy time curve (U²)
- Partial Energy time curve (U²) between the 2 horizontal cursors on the map
- Instantaneous Frequency (Hz)
- 2 vertical cursors coupled with the cursors of the map
- Analysis Parameters and Informations + Bargraphs as in the analysis front panel
- Physical Unit U.
- Energy Display: Total or Partial (defined by cursors)
- Save/recall map file
- Save jpg/bmp images
3D view (Color Waterfall)
- Log/Lin freq axis
- Color scale or Surface
- Full choice of view angle
- 3D Cursor
- Save jpg/bmp images
Algorithms
Transforms:
- STFT: Short-Term Fourier Transform with Gaussian window.
- WV: Smoothed Pseudo Wigner-Ville Transform with 2 independent Gaussian windows. Implemented in analytical form.
- CSD: Cumulative Spectral Decay with Cosine-Tapered (Tukey) Window. Low frequency limit inverse of window duration.
- Wavelet: Gaussian Analytical wavelet (Morlet). Fractional octave bandwidth and center frequencies.
Multispectrum:
- Global Energy Spectrum†: power sum of all spectrum of the multispectrum.
- Sub-Total Spectrum†: sum of all spectrum of the multispectrum, between the 2 verticals cursors.
- Energy Calculus†: sum of all time-frequency values of the whole multispectrum for the total energy, or in the box delimited by the 2 cross-cursors, for the partial energy.
- Energy-Time Curve: sum of all time slices of the multispectrum.
- Partial Energy Time Curve: sum of all time slices of the multispectrum, between the 2 horizontals cursors.
- Group Delay Curve†: centroid of each time slice over frequency.
- Instantaneous Frequency Curve: centroid of each frequency slice over time.
The functions denoted by † are only available when Analysis is complete (Gap Free).
Options Management
- Same hardware key as SoundCheck.
- 2 versions: All algorithms or CSD algorithm only
- In demo mode (data viewer), you can only load map files but you can re-analyze the time data that goes along with them.
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