International conference paper [PDF] [GTTM] [Deep GTTM] Masatoshi Hamanaka, Keiji Hirata, Satoshi Tojo: deepGTTM-II: Automatic Generation of Metrical Structure based on Deep Learning Technique, 13th Sound and Music Conference (SMC2016), pp.221-249, 2016. [PDF] [GTTM] [Deep GTTM] Masatoshi Hamanaka, Keiji Hirata,… (READ MORE)

Awards and articles

Honors & Awards [Thesis(pdf)] The Grand Prize of IPSJ Journal of Information Processing (JIP), Vol.56(2015) [Thesis(pdf)] [Drug discovery] Best Paper Award of IPSJ National Convention, The 77th IPSJ, 2015.  [Thesis(pdf)] [exGTTM] ICMC2005 Best Paper Award (Journal of New Music Research Distinguished Paper Award), ( 文献12), 2005.  [Thesis(pdf)] [Guitarist Simulator]… (READ MORE)

Structures of films

References [PDF] Seiko Takeuchi, Masatoshi Hamanaka, Junichi Hoshino: “Method of structuring a film based on the Generative Theory of Tonal Music”, IPSJ Special Interest Group on Human Computer Interaction, 2015-HCI-162, No. 6, 8 pages, March 2015. [PDF] [Structures of films] [exGTTM] Seiko Takeuchi, Masatoshi Hamanaka: “Structure… (READ MORE)

Researches- Drone

我々は,救急車に先駆けて到着し,救急管制への状況の連絡や,AEDなどの携帯型の医療機器による初期治療を行う「救急ドローン」を開発し救命率を向上させることを目指している.ドローンは,道路渋滞の影響を受けず,物流や救助など様々な分野での利用が期待されているが,上空を多くのドローンが飛行するようになると,衝突の危険性が増加し,高速で飛行させることが困難になることが予想される.そこで我々は,ドローン飛行網の設計および飛行網上を飛行するドローンを管制するシステムを構築する上で重要となる,高精度な位置推定手法の構築を進めてきた.  図:レーザレーダ.jpg, 空路.jpg References Masatoshi Hamanaka, Yuichi Oda: “ディープラーニングに基づくドローン飛行エリアの推定”, JSAI2016 The 30th Annual Conference of the Japanese Society for Artificial Intelligence, June 2016. (発表予定) [PDF] Masatoshi Hamanaka, Fujio Nakano: “ドローンの自動運転・管制を実現する位置検出手法: ディープラーニングに基づく飛行エリアの推定”, The 78th IPSJ, 3B-05, March 2016. [PDF] Masatoshi Hamanaka, Hideki Shiomi: “ドローン飛行網の最適設計手法”, The… (READ MORE)

Researches- Drug discovery

As the number of potential compound-protein interactions (CPIs) that could be assayed is essentially infinite, brute-force experimental screening for CPIs is highly wasteful. Attention has thus been given to CPI prediction models that can guide researchers to fast lanes for… (READ MORE)

Separation of music signal sources

本稿では複数の楽器による混合音源をスペクトル包絡保存に基づく NMF によって個別の楽器の音響信号に分離する方法を提案する.我々の手法は近しい音高であればそのスペクトル包絡が周波数方向にシフトするという調波音の一般 的な特徴に基づいたものであり,各々の楽器の演奏可能なあらゆる中心周波数において基底を設け,隣接した基底についてその包絡が近似するよう制約を行うこ とで分離を行う.この操作は各々の楽器の音色を特徴として成分を分離することに相当し,教師なし学習での調波・非調波混合音源の分離を可能とする.性能評 価実験として MIDI での混合演奏音源を分離し,SNR を求めた結果リードギターについて約 3.6dB,ドラムについて 6.0dB の分解能を得ることができた. This  research  proposes  a  method  to  separate  polyphonic music signal into  signals of  each  musical instrument by NMF: Non-negative Matrix Factorization based on preservation of spectrum envelope. Sound… (READ MORE)

Music Analysis based on Implication-Realization Model

We propose a melody generation system based on the Implication-Realization Model (IRM) of music theory. The IRM is a music theory, which was proposed by Eugene Narmour. The IRM abstracts music. It then expresses music according to symbol sequences based… (READ MORE)

Guitarist Simulator: Learning-based jam session system

This paper describes a jam session system that enables a human player to interplay with virtual players which can imitate the player personality models of various human players. Previous systems have parameters that allow some alteration in the way virtual… (READ MORE)

Fingering Simulator: Guitar fingering estimation from monophony

Fingering Simulator optimizes guitar fingering of monophony by using physical simulator called Springhead2. Unlike most previous guitar fingering optimization systems focusing on moving distances, our method deals with the torque of the finger joints. Experimental results showed that the maximum… (READ MORE)

Concert Viewing Headphones

We designed concert scope headphones that are equipped with a projector, an inclination sensor on the top of the headphones, and a distance sensor on the outside right headphone. We previously developed sound scope headphones that enable users to change… (READ MORE)

Composing music with Twitter

We built “Twitracker” that can post a monophonic melody on Twitter and can create a song by placing posted melodies as materials on Twitter. A shared unfinished song is put into the compositional process by allowing modifying. Most previous composing… (READ MORE)


BandNavi Ver. 1.1 Language: Japanese, English NewForestar Co,.Ltd A band-member-backtracking application called BandNavi has been developed that enables a user to discover new songs and bands by tracing musicians who have played in different bands.Previous similarity-based song recommendation systems only… (READ MORE)

BandNavi HD

BandNavi HD Ver. 1.0 Languages: Japanese and English New Forestar Co,.Ltd BandNavi HD is an iPad version of an iPhone App called BandNavi. BandNavi HD enables a user to notice relations between musicians, and to experience a new way to… (READ MORE)

Discussion structure editor based on music theory

The discussion structure editor generates time-span trees expressing degree of importance of statements. 会議記録の自動要約には、会議の流れや重要発言の認識といった、会議記録の分析が必要です. 本研究では、音楽の分析手法であるGTTMを応用して、会議記録の分析方法の構築を行っています. 音楽においては音イベントが、会議においては発言が時間の進行とともに発生し、ゲシュタルトを生成する相似点に着目しています。 References [PDF] Hiroya Miura, Kenta Togashi, Masatoshi Hamanaka, Katashi Nagao, Satoshi Tojo, Keiji Hirata: “音楽理論を応用したディスカッションマイニングにおけるタイムスパン木と延長木の自動生成について”, IPSJ SIG Digital Contents Creation, Vol. 2013-DCC-3, No.10, January 2013…. (READ MORE)

Polyphonic Music Time-Span Tree Analyzer

We have been developing a music analysis system called a polyphonic music time-span tree analyzer (PTTA). A time-span tree assigns a hierarchy of ‘structural importance’ to the notes of a piece of music on the basis of the Generative Theory… (READ MORE)

Melody expectation method based on GTTM and TPS

A method that predicts the next notes is described for assisting musical novices to play improvisations. Melody prediction is one of the most difficult problems in musical information retrieval because composers and players may or may not create melodies that… (READ MORE)

Melody morphing method based on GTTM

ShakeGuitar (Free), based on the morphing method, is available on App Store (Released on September 26, 2009) This paper describes a melody morphing method that generates an intermediate melody between a melody and another melody with a systematic order according… (READ MORE)

σGTTM System

σGTTM combines the generative theory of tonal music (GTTM) and statistical learning. We previously devised exGTTM, which has accommodated the original GTTM to computer implementations. The exGTTM has adjustable parameters, these parameters have to be manually configured. Therefore, it is… (READ MORE)

Paper list

Journal Papers [PDF] [SCOPE] Shunsuke Kimura, Takuto Matsumoto, Sakurako Yazawa, Junichi Hoshino, SeungHee Lee, Masatoshi Hamanaka: “Child Monitoring Service System Using Indoor Location Detection”, Peer-reviewed, the grand prize of IPSJ Journal of Information Processing (JIP), Vol.56, No.3, pp.856-868, 2015. [PDF… (READ MORE)

Interactive GTTM Analyzer

This paper describes an automatic grouping system, which segments the music into units such as phrases or motives, based on the Generative Theory of Tonal Music (GTTM in short, hereafter). The GTTM is considered to be one of the most… (READ MORE)

An Automatic Grouping of Polyphony

This paper presents a method of grouping that provides a way to automatically analyze the grouping structure of polyphony. Sets of grouping rules have been applied in previous methods, but these methods were not capable of resolving contradictions among the… (READ MORE)

Learning-based Quantization

This paper describes a method for organizing onset times of musical notes performed along a jam-session accompaniment into the normalized (quantized) positions in a score. The purpose of this study is to align onset times of a session recording to… (READ MORE)