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Related Concept Videos

Echo01:06

Echo

532
The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case,...
532

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Accurate and Low-Power Ultrasound-Radiofrequency (RF) Indoor Ranging Using MEMS Loudspeaker Arrays.

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Phased loudspeaker arrays improve indoor positioning accuracy for energy-constrained devices by reducing interference. This hybrid RF-acoustic ranging system achieves centimeter-level precision, outperforming traditional single-speaker setups.

Keywords:
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Area of Science:

  • Acoustics
  • Signal Processing
  • Robotics and Automation

Background:

  • Accurate indoor positioning is crucial for various applications, including professional, care, and personal use.
  • Hybrid RF-acoustic ranging systems offer ultra-low energy consumption for distance measurements but are susceptible to multipath interference.
  • Traditional systems use single loudspeaker beacons, which can limit signal-to-interference-plus-noise ratio (SINR) performance.

Purpose of the Study:

  • To enhance the SINR in hybrid RF-acoustic ranging systems by replacing single loudspeakers with phased loudspeaker arrays.
  • To optimize the design of a low-cost uniform planar array (UPA) for improved ranging performance using ultrasonic chirps.
  • To compare the ranging accuracy of the optimized UPA configuration against a conventional single-loudspeaker system.

Main Methods:

  • Simulated the design of a low-cost uniform planar array (UPA) for ultrasonic chirp-based ranging.
  • Investigated phased loudspeaker array configurations, focusing on vertical arrangements in simulated 'shoe-box' environments.
  • Compared the ranging performance (P50, P95, P80 errors) of the optimized UPA against a single-loudspeaker system.

Main Results:

  • Vertical phased-array configurations demonstrated the lowest ranging errors in simulated indoor environments with limited height.
  • Achieved a P50 ranging error of approximately 3 cm and a P95 ranging error below 30 cm with optimized UPA.
  • A 10 × 2 vertical phased array reduced P80 and P95 ranging errors by up to an order of magnitude compared to single-speaker systems.

Conclusions:

  • Phased loudspeaker arrays significantly improve the SINR and reduce ranging errors in hybrid RF-acoustic systems.
  • Optimized vertical UPA configurations are highly effective for accurate indoor positioning of energy-constrained devices.
  • The proposed system offers a substantial performance improvement over traditional single-loudspeaker approaches for indoor ranging applications.