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This study controls sound directivity and distance attenuation in personal audio systems using loudspeaker arrays and the tangent line method (TLM). TLM generates beams along convex trajectories, enhancing directivity and controlling sound falloff for better listening experiences.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Audio Engineering

Background:

  • Personal audio systems require sound to focus on the listener and decrease beyond.
  • Controlling sound directivity and distance attenuation is crucial for optimal audio experiences.
  • Loudspeaker arrays offer a method for spatial sound control.

Purpose of the Study:

  • To control directivity and distance attenuation in personal audio systems using loudspeaker arrays.
  • To formulate the tangent line method (TLM) for arbitrary circular trajectories.
  • To optimize acoustic contrast by identifying trajectories that maximize it.

Main Methods:

  • Utilizing the tangent line method (TLM) for generating acoustic beams.
  • Creating curvilinear acoustic beams as envelopes of straight acoustic beams (tangent lines).
  • Applying an optimization algorithm to determine the trajectory that maximizes acoustic contrast.

Main Results:

  • The tangent line method (TLM) can generate acoustic beams following arbitrary convex trajectories.
  • Specifying the envelope length of curvilinear beams controls distance attenuation.
  • Enhancing directivity is achieved through the TLM beamforming approach.
  • The formulated TLM for circular trajectories allows for precise sound focusing.

Conclusions:

  • The tangent line method (TLM) effectively controls sound directivity and distance attenuation in personal audio systems.
  • Curvilinear beamforming using TLM offers a novel approach to personalized audio.
  • Optimization of trajectories can significantly enhance acoustic contrast for improved listening.
  • This method provides a pathway for advanced loudspeaker array signal processing.