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Amphi

Technology

True to Life

Binaural Audio and Head-Related Transfer Functions (HRTFs)

  • Binaural audio replicates natural 3D hearing by using at least two audio channels, one for each ear
  • Head-Related Transfer Functions (HRTFs) are spectral fingerprints that capture how sound sources are modified by the head and ears
  • Binaural audio is synthesized through HRTF over 2-channel systems, enabling the perception of virtual 3D sound sources in any direction around the listener
  • This process delivers accurate sound localization and enhances depth perception between close and distant sounds

Cross-talk Cancellation (CTC)

  • Conventional stereo systems converge and flatten spatial cues
  • The perception of spatial audio over headphones is readily achieved due to the separation of left and right channels
  • CTC is processing that enables binaural reproduction through loudspeakers instead of headphones
  • Like a 'virtual headphone', CTC uses interference cancelling filters to ensure each ear receives only its intended audio signal
  • CTC signal separation unlocks HRTF encoding and the perception of spatial cues
  • Compared with headphone reproduction of binaural audio, CTC delivers greater externalization

Speaker Beamforming

  • Processing technique that manipulates the phase and amplitude of audio signals across multiple speakers
  • Controls the size, shape, and direction of acoustic waves to create focused sound beams directed at the listener
  • Enhances the effectiveness of cross-talk cancellation by improving channel separation and reducing interfering sources

Multi Channel Arrays

  • Uses three or more loudspeakers for improved 3D sound reproduction through speaker beamforming
  • Enhances the effectiveness of cross-talk cancellation by improving channel separation and reducing interfering sources
  • Increases loudness while reducing room reflections, improving overall sound quality
  • Scalable from slim notebooks, to soundbars, to multi-speaker display designs

Position-Adaptive 3D Sound

  • Overcomes the sweet-spot limitation of conventional cross-talk cancellation systems
  • Uses Machine Learning powered listener-position sensing to track the alignment of the listener's ears to the audio device
  • Dynamically adjusts audio processing to maintain optimal 3D sound as the listener moves
  • Provides a consistent, high-quality 3D audio experience regardless of listener position

Amphi on Headphones:
3D sound technologies for headphones, headsets, earbuds, XR headsets, AR glasses

Amphi technology, specially engineered for personal listening with speakers, has been adapted for headphone devices to provide product makers with a Total Spatial Audio Solution.

Fixed Position

  • Technology
    • Reproduces the spatial cues from a sound source to the ears at a fixed head position
    • Benefits
      • Provides a 3D sound effect while minimizing computational overhead
      • Compatible with any headphone
    • Use Cases
      • Music listening
      • Movie and video watching
    • Availability
      • Product-ready

    Position-Adaptive

    • Technology
      • Uses head-tracking technology to adjust the rendering in real-time as the listener moves
    • Benefits
      • Delivers a life-like, natural, and immersive listening experience
      • Reduces “front-back confusion” and improves externalization
      • Compatible with any headphone
    • Use Cases
      • Gaming
      • XR/AR experiences
    • Availability
      • Coming soon in Q1 2026

    Contact us to learn more about
    Amphi on Headphones