• 1. Welcome!
• 2. Presentation
  • 2.1. Basic Principles and Concepts
    • 2.1.1. What Acoustics Is
      • 2.1.1.1. What a Sound Is
      • 2.1.1.2. What a Sound Looks Like
      • 2.1.1.3. Elementary Sounds
      • 2.1.1.4. What Decibel Scale and Human Hearing Are
      • 2.1.1.5. Frequency and Fundamental Frequency
      • 2.1.1.6. Octave and Third Octave Bands
      • 2.1.1.7. Bark Scale and Critical Bands
      • 2.1.1.8. Sound Recording and Rendering
    • 2.1.2. Working Principles
  • 2.2. Software Overview
    • 2.2.1. User Interface
    • 2.2.2. Window Management
    • 2.2.3. 2D Curve Management
      • 2.2.3.1. Curve and Legend Display Options
    • 2.2.4. Display Settings
    • 2.2.5. Sound Playback Management
    • 2.2.6. Units
    • 2.2.7. Sound Samples, Tutorials and Examples
    • 2.2.8. Specific Modules
    • 2.2.9. Save All
• 3. Software Configuration
  • 3.1. General Settings
    • 3.1.1. Managing Time-Domain Window
    • 3.1.2. Managing Spectrum Settings
    • 3.1.3. Managing Spectrogram Settings
    • 3.1.4. Managing Order Module
  • 3.2. Managing Physical Units
  • 3.3. Audio Settings Management
    • 3.3.1. Managing Audio Output
    • 3.3.2. Managing Audio Input
    • 3.3.3. Managing the Equalizer
• 4. Signal Processing
  • 4.1. File/Signal Management
    • 4.1.1. File Formats
    • 4.1.2. Signal Tags
    • 4.1.3. Sound Import
      • 4.1.3.1. Import Overview
      • 4.1.3.2. Opening a File
    • 4.1.4. Adding a Temporal Signal to a Window
    • 4.1.5. Adding a Spectrum to a Window
    • 4.1.6. Deleting a Temporal Signal from a Block
    • 4.1.7. Deleting a Spectrum
    • 4.1.8. Displaying Signal Information
    • 4.1.9. Saving a File/Signal
  • 4.2. Signal Playback
    • 4.2.1. Listening to a Full Signal
    • 4.2.2. Signal Part Playback
      • 4.2.2.1. Listening to a Selection in a Signal
      • 4.2.2.2. Signal Playback with Cursors
        • 4.2.2.2.1. Preparing Cursors
        • 4.2.2.2.2. Starting to Listen to a Signal Marked Out with Cursors
    • 4.2.3. Creating a Playlist
    • 4.2.4. Comparing Signals with the Playlist
    • 4.2.5. 3D Sound Playback
      • 4.2.5.1. 3D Sound Transaural
        • 4.2.5.1.1. Binaural Sound
        • 4.2.5.1.2. Transaural Sound
        • 4.2.5.1.3. Transaural Filters and Recommended Configuration
      • 4.2.5.2. 3D Sound Preparation
        • 4.2.5.2.1. Setting Up Loudspeakers
        • 4.2.5.2.2. Managing a Transaural Filter
      • 4.2.5.3. Starting 3D Sound Playback
      • 4.2.5.4. Saving a 3D Transaural Sound
  • 4.3. Sound Recording
    • 4.3.1. Managing the Sound Recording
    • 4.3.2. Calibrating the Recording
    • 4.3.3. Starting the Sound Recording
  • 4.4. Sound Generation
    • 4.4.1. Sound Generation by Mixing
      • 4.4.1.1. Importing Sounds in the Mix Table
      • 4.4.1.2. Mixing Sounds
      • 4.4.1.3. Saving a Mix
        • 4.4.1.3.1. Saving a Mix from the Mix Table
        • 4.4.1.3.2. Saving a Mix from the Temporal Window
      • 4.4.1.4. Exporting the Settings of a Mix
    • 4.4.2. Generating a Stereo Signal
    • 4.4.3. Generating a Mono signal
    • 4.4.4. Generating an Extended Signal from a Short Duration Signal
    • 4.4.5. Sound Creation from Spectrum
      • 4.4.5.1. Methods for Sound Creation
      • 4.4.5.2. Supported Spectrum Types
      • 4.4.5.3. Sound Creation from Ansys Mechanical Simulation
        • 4.4.5.3.1. Generating a Signal from a Spectrum
        • 4.4.5.3.2. Generating a Signal from Waterfall
        • 4.4.5.3.3. Calling the Processing in Command line
      • 4.4.5.4. Spectrum as a txt File
  • 4.5. Signal Modification
    • 4.5.1. Modifying a Signal with Basic Editing Tools
    • 4.5.2. Sound Effects
      • 4.5.2.1. Inserting a Silence
      • 4.5.2.2. Applying a Fade-in/Fade-out
      • 4.5.2.3. Amplifying/Attenuating a Selection in a Signal
    • 4.5.3. Applying a Frequency Weighting to a Signal
    • 4.5.4. Filtering a Sound
    • 4.5.5. Resampling a Signal
    • 4.5.6. Modify Sampling Frequency
    • 4.5.7. Signal Equalization
      • 4.5.7.1. Choosing the Equalizer
      • 4.5.7.2. Filtering a Signal through the Equalizer
      • 4.5.7.3. Displaying the Filtered Signal
      • 4.5.7.4. Loading Equalizer Settings
    • 4.5.8. Smoothing a Signal Curve
    • 4.5.9. Removing Negative Values from a Signal
    • 4.5.10. Transforming a Signal into its Opposite
    • 4.5.11. Applying a Time Reversal to a Signal
    • 4.5.12. Computing the Addition of Two Signals
    • 4.5.13. Computing the Difference between Two Signals
    • 4.5.14. Shifting the Pitch
    • 4.5.15. Time Stretching a Signal
    • 4.5.16. Shifting the Frequencies by a Constant
    • 4.5.17. Creating a Looped Sound
  • 4.6. Signal Conversion
    • 4.6.1. Calibrating a Signal
    • 4.6.2. Converting a Signal
    • 4.6.3. Signal Conversion Methods
      • 4.6.3.1. Integration
      • 4.6.3.2. Double Integration
      • 4.6.3.3. Differentiation
      • 4.6.3.4. Double Differentiation
  • 4.7. Signal Profiles
    • 4.7.1. RPM Profile
      • 4.7.1.1. Associating an RPM Profile with a Signal
      • 4.7.1.2. Displaying an RPM Profile
      • 4.7.1.3. Removing an RPM Profile
    • 4.7.2. PWM Profile
      • 4.7.2.1. Associating a PWM Profile with a Signal
      • 4.7.2.2. Displaying a PWM Profile
      • 4.7.2.3. Removing a PWM Profile
    • 4.7.3. Generic Profile
      • 4.7.3.1. Associating a Profile with a Signal
      • 4.7.3.2. Displaying a Profile Associated with a Signal
      • 4.7.3.3. Removing a Profile Associated with a Signal
• 5. Signal Analysis
  • 5.1. Waveform Analysis
    • 5.1.1. Calculating Levels
    • 5.1.2. Calculating a Signal Envelope
  • 5.2. Spectral Analysis
    • 5.2.1. Calculating a Spectrum
    • 5.2.2. Importing a Spectrum
    • 5.2.3. Changing the Unit of a Spectrum
    • 5.2.4. Spectrum Calculation Details
      • 5.2.4.1. Narrow Band Spectrum
      • 5.2.4.2. Autospectrum
      • 5.2.4.3. Autospectrum (Peak)
      • 5.2.4.4. RMS Spectrum
      • 5.2.4.5. RMS Spectrum (Peak)
      • 5.2.4.6. Power Spectral Density (PSD)
      • 5.2.4.7. Octave and Third Octave Spectrum
    • 5.2.5. Display Options for the Spectrum Window
    • 5.2.6. Displaying Levels in a Spectrum Window
    • 5.2.7. Partial Levels Calculation
      • 5.2.7.1. Displaying the Partial Levels
      • 5.2.7.2. Defining Frequency Bands with Cursors
  • 5.3. Spectrogram Analysis
    • 5.3.1. Calculating the Spectrogram
    • 5.3.2. Changing the Spectrogram Magnitude Display
    • 5.3.3. Converting the Spectrogram
    • 5.3.4. Displaying the Spectrogram with a Frequency Weighting
    • 5.3.5. Transferring a Spectrogram to the Time Domain
  • 5.4. Signals Comparison
    • 5.4.1. Organizing Signals in Multiple Windows
    • 5.4.2. Organizing Signals in the Same Window
      • 5.4.2.1. Organizing Signals in New Blocks of the Same Window
      • 5.4.2.2. Organizing Signals in an Existing Block of the Same Window
    • 5.4.3. Modifying the Appearance of a Signal Curve
    • 5.4.4. Comparing Signals by Listening
  • 5.5. Time-Frequency Component Analysis
    • 5.5.1. Time-Frequency Component Preparation
      • 5.5.1.1. Setting the Color Scale
      • 5.5.1.2. Setting the Time-Frequency Calculation
      • 5.5.1.3. Adjusting the Signal Window
    • 5.5.2. Selections Management in Time-Frequency Representation
      • 5.5.2.1. Making a Basic Selection
      • 5.5.2.2. Making a Selection Resulting from an Intersection
      • 5.5.2.3. Making a Time Slice
      • 5.5.2.4. Making a Frequency Slice
      • 5.5.2.5. Saving a Selection
      • 5.5.2.6. Loading a Selection
      • 5.5.2.7. Detecting Harmonics
      • 5.5.2.8. Detecting PWM Harmonics
      • 5.5.2.9. Isolating a Time-Frequency Component
    • 5.5.3. Time-Frequency Component Modification
      • 5.5.3.1. Modifying the Gain in dB of a Time-Frequency Component
      • 5.5.3.2. Deleting a Time-Frequency Component
      • 5.5.3.3. Inverting a Selection
      • 5.5.3.4. Undoing a Time-Frequency Modification
  • 5.6. Loudness Colormap
    • 5.6.1. Calculating a Loudness Colormap
    • 5.6.2. Analyzing the Loudness Colormap
• 6. Psychoacoustics
  • 6.1. Concepts and Basic Principles
    • 6.1.1. What Psychoacoustics Is
    • 6.1.2. For which type of sounds the Psycho module should be used
    • 6.1.3. Psychoacoustics Module Overview
  • 6.2. Auditory Perception
    • 6.2.1. Frequency Weighting (A, B and C-weighting)
    • 6.2.2. Loudness
    • 6.2.3. Critical Bands
    • 6.2.4. Masking
    • 6.2.5. Sharpness
    • 6.2.6. Roughness and Fluctuation Strength
  • 6.3. Computation Profiles
    • 6.3.1. Computation Profiles Overview
    • 6.3.2. Standard Levels
    • 6.3.3. Max Values
    • 6.3.4. Value vs Time
    • 6.3.5. Indicators for Stationary Sounds
    • 6.3.6. Indicators for Impulsive Sounds
    • 6.3.7. Indicators for Non-Stationary Sounds
    • 6.3.8. Tonality
      • 6.3.8.1. Tonality Overview
      • 6.3.8.2. Prominence Ratio
      • 6.3.8.3. Tone-to-Noise Ratio
      • 6.3.8.4. ISO1996-2:2007 Annex C
      • 6.3.8.5. DIN45681
      • 6.3.8.6. Aures Tonality
      • 6.3.8.7. Psychoacoustic Tonality
    • 6.3.9. Intelligibility
    • 6.3.10. Comfort Equations
      • 6.3.10.1. Comfort Equations Overview
      • 6.3.10.2. Roughness Model and Computation
      • 6.3.10.3. Fluctuation Strength Computation
    • 6.3.11. Aeronautic Indicators
    • 6.3.12. EPNL Helicopter/Aeroplane
  • 6.4. Starting Psychoacoustics Module
  • 6.5. Sound Perception/Quality Evaluation
    • 6.5.1. Relevant Indicators Computation
      • 6.5.1.1. Estimating the Sound Level
      • 6.5.1.2. Studying the Perception of Stationary Sounds
      • 6.5.1.3. Studying the Perception of Impulse Sounds
      • 6.5.1.4. Studying the Perception of Non-Stationary Sound
      • 6.5.1.5. Studying the Perception of Tones in Complex Sounds
      • 6.5.1.6. Studying the Perception of Human Speech
      • 6.5.1.7. Studying Annoyance
      • 6.5.1.8. Studying the Perception of Aeronautic Sounds
    • 6.5.2. Custom Profile
      • 6.5.2.1. Parameters Overview
      • 6.5.2.2. Computing a Custom Profile
    • 6.5.3. Results Management
      • 6.5.3.1. Managing Curve Results
      • 6.5.3.2. Clearing the Results Table
      • 6.5.3.3. Exporting/Saving Results
    • 6.5.4. Multiple Signals Equalization
      • 6.5.4.1. Equalizing Signals according to a Reference Signal
      • 6.5.4.2. Equalizing Signals according to a Target Loudness
• 7. Orders and Harmonic Tools
  • 7.1. What Order Analysis Is
  • 7.2. What Tachometric Signal Is
  • 7.3. General Settings
  • 7.4. Order Analysis
    • 7.4.1. Theory of Order Analysis
    • 7.4.2. Order Detection
      • 7.4.2.1. Detecting Harmonics
      • 7.4.2.2. Detection Parameters
      • 7.4.2.3. Creating a Tachometric Signal
    • 7.4.3. Order Selection
      • 7.4.3.1. Selecting Orders Manually
      • 7.4.3.2. Selecting Orders Automatically
    • 7.4.4. Modifying an Order
    • 7.4.5. Changing the Representation Display
    • 7.4.6. Displaying Order Levels in a Graph
    • 7.4.7. Changing the Ordinate Unit of the Order Levels Graph
    • 7.4.8. Creating an Order Analysis Report
  • 7.5. TNR and PR of Orders
    • 7.5.1. Calculate TNR or PR from a Temporal Signal
    • 7.5.2. Calculate TNR or PR from a Spectrogram
  • 7.6. Car Sound Synthesis
    • 7.6.1. Car Sound Simulator-related Synthesis
      • 7.6.1.1. Generating a *.partial File
      • 7.6.1.2. Generating a *.noise File
      • 7.6.1.3. Vehicle Parameters
      • 7.6.1.4. Comparing Synthesized and Original Sounds
      • 7.6.1.5. Sound Control Panel
    • 7.6.2. Generating a *.box File
    • 7.6.3. Generating a *.ord File
• 8. Pulse Width Modulation Tools
  • 8.1. What PWM Analysis Is
  • 8.2. PWM Detection
    • 8.2.1. Detecting PWM Harmonics
    • 8.2.2. Creating a PWM Profile
  • 8.3. PWM Selection
    • 8.3.1. Selecting PWM Harmonics Manually
    • 8.3.2. Selecting PWM Harmonics Automatically
    • 8.3.3. Modifying a PWM Harmonic
• 9. Xtract for Components Separation
  • 9.1. XTRACT Overview
    • 9.1.1. Basic Principle
    • 9.1.2. Interface
    • 9.1.3. What Denoising Is
    • 9.1.4. Computation Modes
    • 9.1.5. Algorithms
    • 9.1.6. Data Formats
  • 9.2. Component Extraction
    • 9.2.1. Starting Xtract Module
    • 9.2.2. Choosing a Computation Mode
    • 9.2.3. Loading One File
    • 9.2.4. Loading a Multiple Files Batch
    • 9.2.5. Setting an Algorithm
      • 9.2.5.1. Noise Extraction Parameters
      • 9.2.5.2. Tonal Extraction Parameters
      • 9.2.5.3. Transient Extraction Parameters
    • 9.2.6. Setting the Save/Export Directory
    • 9.2.7. Launching the Extraction Computation
  • 9.3. Result Management
    • 9.3.1. Listening to a Resulting Signal
    • 9.3.2. Using the Mix Table
    • 9.3.3. Saving/Exporting a Signal
• 10. Sound Composer
  • 10.1. Sound Composer Overview
    • 10.1.1. Sound Composer Source Types
    • 10.1.2. Source Formats
    • 10.1.3. Sound Generation Methods
  • 10.2. Creating a Sound Composer Project
  • 10.3. Creating a Track in Sound Composer
    • 10.3.1. Creating a Track with an Audio Source
    • 10.3.2. Creating a Track with a Harmonics Source
    • 10.3.3. Creating a Track from a Spectrum
    • 10.3.4. Creating a Track from a Broadband Noise Source
    • 10.3.5. Creating a Dataset
      • 10.3.5.1. Creating a Broadband Noise Model (1 Parameter)
      • 10.3.5.2. Creating a Harmonics Model (1 Parameter)
      • 10.3.5.3. Creating a Broadband Noise Model (2 Parameters)
      • 10.3.5.4. Creating a Harmonics Model (2 Parameters)
      • 10.3.5.5. Dataset Coverage
    • 10.3.6. Adding a Source Control to a Track
      • 10.3.6.1. Generating a Profile
    • 10.3.7. Adding a Filter to a Track
  • 10.4. Adding a Track to a Sound Composer Project
  • 10.5. Adding a Source to a Sound Composer Track
  • 10.6. Mixing Tracks in Sound Composer
  • 10.7. Displaying the Overall Sound
• 11. Frequency Response Function Estimation
  • 11.1. FRF Estimation Overview
  • 11.2. Estimating an FRF
  • 11.3. Saving the FRF File
• 12. Generating an Analysis Report
• 13. Keyboard Shortcuts
  • 13.1. Cursor Management
  • 13.2. Audio Management
  • 13.3. Time-Domain Window Management
  • 13.4. Frequency-Domain Window Management
  • 13.5. Time-Frequency Window Management
  • 13.6. File Management
  • 13.7. Edition Management
  • 13.8. Modules Launch
• 14. Troubleshooting
  • 14.1. Headphones Issues
  • 14.2. User Interface Display Issues
  • 14.3. Limitations
• 15. Glossary of Terms
  • 15.1. Audio Calibration
  • 15.2. Colormap
  • 15.3. Envelope
  • 15.4. Equalization
  • 15.5. FFT Fast Fourier Transform
  • 15.6. Frequency
  • 15.7. Fundamental Frequency
  • 15.8. Harmonics
  • 15.9. Partial
  • 15.10. Partial Levels
  • 15.11. Physical Units
  • 15.12. Resampling
  • 15.13. Sampling Rate/Sampling Frequency
  • 15.14. Spectrum
  • 15.15. Timbre
  • 15.16. Time-Frequency Representation
  • 15.17. Waveform
  • 15.18. Window and Block
  • 15.19. Window Type
• i. Copyright and Trademark Information