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Takahashi Lab
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The lab does research on acoustic signal processing, using signal processing to advance sound mixing.
AboutAbout the lab
Advancing how sounds are mixed through signal processing
The Takahashi Lab studies the handling of sound signals through digital signal processing.
The lab proposes a new kind of mixer, the "smart mixer," which has a mechanism for analyzing and processing input sound.
It also works on remote choir technology, which automatically turns choir recordings made under varied conditions into a single finished piece.
To process sound in real time, the lab also uses FPGAs, which are rewritable integrated circuits.
Key terms
- Smart mixer
- A new, advanced audio mixer with a mechanism for analyzing and processing input signals
- Remote choir
- A choir piece made by gathering singing voices recorded under varied conditions
- FPGA
- An integrated circuit whose electronic circuits can be freely programmed. It is characterized by high parallel processing capability
ResearchResearch themes
The lab's main themes include mixing of acoustic signals, professional audio equipment, high-speed computing devices for real-time processing, and the development of signal processing technology that automatically turns remote choir recordings into a finished piece. The lab also creates speech databases and music databases.
*Illustrative imageA mixing method that keeps speech from being buried
When mixing two or more signals, the lab obtains the output by applying amplitude processing only to the necessary parts, based on the spectral structure of each signal. The aim is to avoid causing discomfort to listeners and let them enjoy both sounds.
*Illustrative imageSignal analysis for mixing
To achieve precise mixing, the lab proposes an analysis method that can accurately represent the key features of a sound signal. It is also considering multiresolution analysis in combination with conventional analysis methods.
*Illustrative imageHardware implementation of the smart mixer
By implementing the mixer in hardware, the lab achieves real-time processing. Using FPGAs, it aims to provide interactive operation.
*Illustrative imageAutomatic mixing for remote choirs
This is a technique that automatically mixes choir recordings made under different conditions of volume, sound quality, and start timing, to produce a highly polished piece. The lab does this research in collaboration with Hamorus, a group of IT engineers.
MembersFaculty
The members of the Takahashi Lab are faculty, master's students, and fourth-year undergraduate students.As of 2024
- Associate ProfessorKota Takahashi
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: “Mixing and mastering” Max Rayden / CC BY-SA 4.0 (cropped)
- A mixing method that keeps speech from being buried: “Monitor Mixing Setup” Sonicvibesolutions / CC BY 4.0 (cropped)
- Signal analysis for mixing: “Audio spectrogram sonic visualiser” Sagenat2 / CC BY-SA 4.0 (cropped)
- Hardware implementation of the smart mixer: “Audio mixer close up” Lchader / CC BY-SA 4.0 (cropped)
- Automatic mixing for remote choirs: “Overton Choir (1499711)” Geoff Charles / CC BY-SA 4.0 (cropped)
- Related lab (Akita Lab): “Radar tower at RAF Leeming” amcD300 / CC BY 2.0 (cropped)
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- Related lab (Nishi Lab): “Stardust - NC - shake test” JPL / Public domain (cropped)
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