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Geometry and sound - mapping and positioning using sound

AI Lund lunch seminar 5 December 2021

Bats can fly in the dark without colliding with each other. How difficult is it to build machines that can also make "sound maps" and navigate with the help of sound?

Title: Geometry and sound - mapping and positioning using sound

When: 12 May 2021 at 12.00-13.15

Speaker: Kalle Åström, Mathematical Imaging Group at Lund University

Spoken language: English

Host and moderator: Jonas Wisbrant


Bats navigate in the dark by analysing the echo from their own high-frequency beeps. That ability should be able to be transferred to machines. Some robots use Lidar *, which is a kind of radar but with a laser. It would be practical to be able to do the same thing ordinary sound.

For a few years now, Kalle Åström has been involved in research that aims to map a three-dimensional room with the help of sound and microphones determine where the sound sources and and microphones are located based on the delay between the first, second and perhaps following echoes.

Research questions are:

  • How do you calculate where the microphones are?
  • How do you calculate where the sound sources are and how they move?
  • What type of signal processing is needed to solve these problems?
  • What shape does the room have?

At this lunch seminar, Kalle Åström talks about his research in this area - what they have come up with so far and what they plan for future research.

Light detection and ranging