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Acoustic Systems Lab [Communications, Agricultural Facilities, ICT Construction] (Communication Systems Lab)
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The lab uses sound and light to bring communication, positioning, and sensing to the sea, farms, and roads.
AboutAbout the lab
Taking signal processing from wireless communication to sound and light
The Communication Systems Lab applies digital signal processing, developed through wireless communication research, to acoustic waves and visible light, and studies communication, positioning, and sensing.
Its target environments include the sea, where radio waves do not reach; construction sites in turbid water; crowded roads; and farms, livestock barns, and greenhouses.
The lab does not stop at theory and simulation. It values bringing devices that students build themselves to real sea areas, pig farms, cattle barns, and greenhouses to test them.
In graduation research, each student aims to build one system on their own from start to finish and get it working in practice.
Key terms
- Digital signal processing
- Technology for handling signals such as sound and light, used in communication and positioning, as numerical data on a computer
- Visible light communication
- Communication that sends information using the light of LEDs already in the city, such as traffic signals and headlights
- Positioning
- Determining where something, such as a work machine, is at the moment, using sound or light
ResearchResearch themes
Conditions differ from site to site, whether it is the sea, roads, farms, livestock barns and greenhouses, or underwater construction sites, but the technology needed is common. The lab applies digital signal processing, developed through wireless communication research, to acoustic waves and visible light, and brings communication, positioning, and sensing to each site.
*Illustrative imageUnderwater communication for undersea IoT
In the sea, where radio waves barely propagate, sound is the only means of communication. The lab designs methods that communicate quickly and reliably even in shallow water, where reflections arrive in a jumble and conditions change from moment to moment with the waves, and tests them in real sea areas.
*Illustrative imageAcoustic communication using broadcast equipment and smartphones
This is a mechanism that sends information using only the speakers around us and the microphones of smartphones. To make it usable without adding dedicated equipment, the lab designs modems with low computational cost.
*Illustrative imageVisible light communication for road traffic
The lab uses the light of LEDs that already exist in the city, such as traffic signals and headlights, for communication. Its strength is that it can deliver information without interference even where radio bands are congested.
*Illustrative imageAcoustic monitoring for agriculture and livestock
The lab detects signs of poor health from the sound of pigs sneezing, and detects hard-to-control greenhouse pests (whiteflies). It applies signal processing techniques to solving problems at agricultural and livestock sites.
MembersFaculty
The members of the Communication Systems Lab consist of faculty, researchers, technical staff, visiting researchers, and students in the doctoral program, the master's program, and the undergraduate school.As of 2026
- Associate ProfessorTadashi Ebihara
- Associate ProfessorNaoto Wakatsuki
- Project Assistant ProfessorAtsushi Tsuchiya
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Scuba diver SCTLD antibiotic paste” Joe Snyder/NOAA / Public domain (cropped)
- Underwater communication for undersea IoT: “GRNMS - Hydrophone Deployment ( )” National Marine Sanctuaries / Public domain (cropped)
- Acoustic communication using broadcast equipment and smartphones: “Public-address-system” A.D.Balasubramaniyan / CC BY-SA 3.0 (cropped)
- Visible light communication for road traffic: “LED traffic light on red” Kevin Payravi / CC BY-SA 4.0 (cropped)
- Acoustic monitoring for agriculture and livestock: “Orange Pig barn at Drumlin Farm Wildlife Sanctuary of Audubon Society in Lincoln Massachusetts” Swampyank / CC BY-SA 4.0 (cropped)
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（センシングシステム研究室） ): “LBL Acoustic Positioning Aquamap ROV” Desertstar / CC BY 3.0 (cropped) - Related lab (機械知能研究室): “Unraveling AI Complexity - A Comparative View of AI, Machine Learning, Deep Learning, and Generative AI” PopovaZhuhadar / CC BY-SA 4.0 (cropped)
- Related lab (建築構造研究室): “StructuralTesting 020” National Institute of Standards and Technology / Public domain (cropped)
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