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Speech Information Processing Lab (Tokihiko Kaburagi)
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A lab that studies how people produce and perceive speech.
AboutAbout the lab
Uncovering the essence of human speech communication
The Speech Information Processing Lab of Prof. Kaburagi aims to clarify more fundamentally how people communicate with their voices.
The lab studies how speakers produce speech, how listeners perceive it, and how the two are related.
It works on observing the movements of the articulators and on elucidating how the vocal folds generate the sound source of the voice.
In education, the professor teaches courses in phonetics, speech signal processing, and speech information processing at both the undergraduate and graduate levels.
Key terms
- Articulators
- Organs such as the jaw, lips, and tongue that change the shape of the mouth to produce different speech sounds
- Glottal waveform
- The wave produced by vocal fold vibration that serves as the sound source of voiced sounds
- Speech perception
- The function by which the auditory system receives sound and perceives it as speech
ResearchResearch themes
To clarify the essential nature of human speech communication, the lab investigates the mechanisms of speech production during talking, the mechanisms of speech perception in the auditory system, and the interdependence between the two. Specific topics include observing articulator movements, elucidating and estimating how the glottal waveform is generated, and speech synthesis methods.
Observing articulator movements
The lab uses a magnetic sensor system to observe the movements of articulators such as the jaw, lips, and tongue, which control the shape of the mouth during speech. Based on these observations, it works to identify the functions of these movements.
*Illustrative imageHow the glottal waveform is generated
This research clarifies the physical mechanism by which vocal fold vibration generates the glottal waveform (the sound source of voiced sounds).
Estimating the glottal waveform from speech
Based on signal processing methods, the lab is investigating ways to inversely estimate the glottal waveform from the speech signal.
*Illustrative imageSpeech synthesis based on the mechanism of speech production
The lab studies speech synthesis methods based on the mechanisms by which humans produce speech.
MembersFaculty
- ProfessorTokihiko Kaburagi
VoicesStudent voices
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Speech Science LabSchool of Design, Department of DesignSpeech scienceThe information on this page is compiled by the LabLog team from the lab's public information and interviews. For corrections or removal requests, please contact LabLog, not the lab.
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: “Petra, People in conversation, Jordan” Vyacheslav Argenberg / CC BY 4.0 (cropped)
- How the glottal waveform is generated: “Singlemass - vocal folds motion model schematic (single mass-spring-damper system)” wikibooks:User:Sshibata / Public domain (cropped)
- Speech synthesis based on the mechanism of speech production: “Synte 2 speech synthesizer” Timo Rossi / CC BY 2.0 (cropped)
- Related lab (Speech Information Processing Lab): “Tracto vocal” Itsnaaav / CC BY-SA 4.0 (cropped)
- Related lab (Auditory Information Processing Lab): “Auditory system - Inner ear -- Smart-Servier” Laboratoires Servier / CC BY-SA 3.0 (cropped)
- Related lab (Auditory Information Processing Lab): “Auditory system - Organ of Corti -- Smart-Servier” Laboratoires Servier / CC BY-SA 3.0 (cropped)
- Related lab (Speech Science Lab): “Human Larynx Model ( )” YVC Biology Department / CC BY 2.0 (cropped)
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