CATT-Acoustic v8.0

Auralization/Post-processing Module 

• post-processing is based on results from the Prediction or the Multiple Source Addition modules
• general auralization method that is the result of 17 years of development and experience of auralization and, just like the prediction method, it employs several different techniques. For special cases also an ISM-based method can be used
• 44.1 or 48 kHz operation
• full bandwidth auralization by using extrapolation where necessary
• binaural, microphone, stereo,5-channel or B-format (also 2nd order RSTUV an 3rd order KLMNOPQ) post-processing. 5-channel mic setups can be exchanged with PureVerb.
• CATT-Walker™ real time walkthrough visualization and auralization:
• IOA Copenhagen 2006 paper and presentation download
   

  sample CATT-Walker™ screen

• multiple source  walkthrough visualization (all sources using the same anechoic inoput - typically for PA systems)
  
• optional use as an "acoustics engine" together with separate VR real time graphics (via e.g. TCP/IP using the Walker Steer SDK, available separatelly for full version users).
• binaural output for headphones
  
• B-format output (requires a 4-channel capable soundcard to be installed and selected and an ambisonic decoder to be used externally or via e.g. at Virtual Audio Cable (VAC) that creates a virtual sound card making it possible to feed the B-format output of Walker to another application on the same PC (e.g. a VST host) with an Ambisonic decoder plugin)
  
• HRTFs may have arbitrary resolution
• Several HRTF sets provided
• a person's HRTFs
• ITA-Kunstkopf
  
• KEMAR artificial head measured by Bill Gardner and Keith Martin
• the Listen project public HRTF (51 sets)
  
• analytical sphere HRTFs
• open interface for use entry of HRTFs at a basic resolution, other resolutions from case to case.
  
• IACC calculation for binaural responses (Inter-Aural Correlation Coefficient) 
• multiple source auralization using the same anechoic source (typically for PA systems) or using different anechoic sources (e.g. auralization of stereo speakers, background noise + speech etc.)
• 5-channel replay/setups/simulations for special-purpose tests (e.g. 5-channel recording techniques)
• loudspeaker replay of simulated or recorded binaural sound via loudspeakers using cross-talk cancellation filters. General implementation where loudspeaker positions are selected and with optional individual loudspeaker correction. Many options for creating the cross-talk filters.
• CD with anechoically recorded source material included with full versions
• Some useful WAV-file filers for IR listening
  
• optional direct impulse response output to 16-bit WAV, 32-bit WAV, MATLAB or MLSSA formats.
• file-conversion utilities (MATLAB .MAT, MLSSA .TIM, .WAV, Lake .SIM,...)
• general and secure handling of HRTF libraries and headphone equalization filters enables licensing of HRTF libraries and headphone filters from various sources (so far 4 distinct HRTF sets are available and 10-15 headphone filters). Headphone equalization and HRTFs in user Preferences
• sample rate conversion tool also to 16, 22.05, 88.2 and 96 kHz (integer ratios)
• impulse response filtering tool (headphone eq, cross-talk cancellation, general FIR eq)
• impulse response viewing tool (windowed IRs and frequency responses, spectrograms, play IR)
• software convolution: 
• at real-time speed of anechoic music/speech with synthesized impulse responses, direct listening to impulse responses
• at real-time speed with 16-, 24- or 32-bit impulse responses in WAV-format (e.g. measured impulse responses), direct listening to impulse responses. See also the free GratisVolver™.
• for walkthrough including fast head rotations for synchronization to graphics walkthrough from e.g. 3ds max. Walkthrough can be created as binaural, cross-talk cancelled binaural, 5-channel or B-format (for Ambisonic). Included is a tool WalkDecim that converts a camera path exported from a 3D rendering software to a receivcer list and a walkthrough convolver script.
• can also be performed in real time and with low latency for virtual reality applications using Lake Technology hardware where also loudspeaker replay using Ambisonic and dynamic auralization with head-tracking can be selected
• can also be performed using the CATT MultiVolver (up to 8x8, e.g. 8 sources and 5-channel responses = 8x5).
• anechoic WAV-file info compilation (scale-factor, level in octave-bands, reference etc.)
• WAV-file player with single-file, A/B and play-list functions (runs automatically after a convolution)
• full version users are automatically also licenced for The FIReverb Suite™
 

sample graphics/screen-shots