Page  508 ï~~Studio Report: The Institute of Computer Science, Hebrew University Dan Gang * Insitute of Computer Science The Hebrew University Givat Ram, Jerusalem, Israel ph: 011-972-2-658-5353 fax: 011-972-2-658-5439 email: url: dang Abstract This report contains a general description of the Computer Music activities at the Computer Science Instituteof the the Hebrew University in Jerusalem. The research activities include Artificial Intelligence(AI), Distributed Al and Neural Nets techniques to model Music Cognition activities. And Nonlinear Acoustic Signal Processing. This report also contains a pointer to our education program for Computer Science students and other interesting topics and pointers to the people, institutes and forums in Israel that relate to our work. Additional information may be obtained from the Word Wide Web. 1 Introduction Computer Science was first established as a graduate department in 1969 and later extended to include undergraduate education in 1980, all within the Institute of Mathematics. In 1992, computer science officially separated from mathematics, to become the Institute of Computer Science. Beginning with a core of faculty members, the department has been steadily growing at an average rate of about one faculty position per year, * Partially supported by the Jean and Helene Alfassa fund it has reached 22 members by 1995. The number of students has also been steadily growing, especially in the past few years, due in part to the large demand by new immigrant students, and in part to general demand in Israel for professionals with computer science education.There are about 430 Computer Science students enrolled in 1995/1996, with the following distribution: BSc - 300 students, MSc - 90 students and Phd - 40 students. The Institute enjoys a very high international reputation. The faculty attracts many competitive research grants, both in Israel and abroad. There are many research projects and efforts that are performed in cooperation with scientists from other countries. The Institute is closely associated with the Leibniz Center for Research in Computer Science,established in 1985 with funds from the Minerva Foundation. Finally, two faculty members won the most prestigious prizes in Computer Science (the Turing Award) and theoretical Computer Science (the Nevanlinna Prize). For more details on: research areas, program study, faculty, student enrollment and the equipment, look at 2 Computer Music Computer Music at the Hebrew University is represented by two groups working in different Gang 508 ICMC Proceedings 1996

Page  509 ï~~areas. The first group works in the framework of: the Artificial Intelligence (AI) and Distributed Artificial Intelligent (DAI)labs. The aim of their work is to build models for Music Cognition using: Hierachical Neural Nets, Hybrid system and Multi Agent based systems. The AI lab is headed by Prof. Daniel Lehmann who is currently the chairman of the Computer Science Institue. The DAI lab is headed by Prof. Jeff Rosenschein. 1. This group include the research students: Claudia Goldman and Dan Gang and some graduate students. The equipment of the labs includes workstations (Sun and SGI's), PC's(Pentium 120) and Mac. The labs use different musical hardware and software such as: MultiSound and AWE32 -SB sound cards, Roland Keyboard E-38, RX drum Machine, MidiMic,Qbase Score/Audio and Encore Notator, MidiScane, Dmix and VisualWorks environments and MAX for SGI. The second group works in the framework of Machine Learning lab on projects in the field of Musical Signal Processing and Nonlinear Acoustic Signal Processing. The Machine Learning lab is headed by Prof. Naftali Tishby 2. This group include the research student Shlomo Dubnov and the guest Dr. Eliezer Rapoport. The Machine Learning lab includes several SGI workstations and PCs. 3 Education This year, for the second time, we give the academic course: Introduction to Computer Music, for the undergraduate and graduate students. The aim of the course is to give basic ideas and skills in: MIDI and Audio, Musical Signal Processing, Music Cognition and Artificial Intelligence in Music. We built a home page for this course, so for more information you are welcome to visit in: comus. 'Lo at 2oo at http://www/labs/learning/labp age.html In this home page you can find details on: the course teachers, informative plan and schedule of the program and even the description of the assignments. 4 Research At ICMC96 the Hebrew University present three papers from the Hebrew University will be presented: " The Effect of Frequency Modulating Jitter on Higher Order Spectra with Applications to Sound Synthesis and Classifications - Shlomo Dubnov, Naftali Tishby and Dalia Cohen. " NetNeg: A Hybrid Interactive Architecture for Composing Polyphonic Music in Real Time - Claudia V. Goldman, Dan Gang, Daniel Lehmann and Jeffrey S. Rosenschein. " Modeling the Degree of Realized Expectation in Functional Tonal Music - Dan Gang and Jonathan Berger. Some more titles of recent papers will give you an idea of our research directions, and who is doing what. " Emotional Expression Code in Opera and Lied Singing - Eliezer Rapoport, to appear in Journal of New Music Research. " Harmonizing Melodies with Neural Nets - Dan Gang and Daniel Lehmann, ICMC95, Banff. " Modeling Musical Expectations: A Neural Network Model of Dynamic Changes of Expectation in the Audition of Functional Tonal Music - Proceedings of the Fourth International Conference on Music Perception and Cognition, Montreal, 1996. ICMC Proceedings 1996 509 Gang

Page  510 ï~~5 Related Topics 5.1 Interest Group Meetings In the following sub-sections we will briefly describe two groups which we work in close contact. 5.1.1 The Israeli Computer Music Forum The Israel Computers and Music Forum (ILCMF) was established on February, 1994. The purpose of the forum is to supply a national framework of interaction between scientists and musicians interested in the field. Since its establishment,IL-CMF held four conferences, two workshops and several concerts. The IL-CMF aims are to: " Conduct a multi disciplinary research in Computer Science, Engineering and Acoustics in the field of music. " Encourage composers into producing new works of music using new technologies. " Promote computer-aided musicological research, and to serve as a means of exchange among those researchers. " Establish continuous relationships with the international musical and scientific communities. " Promote teaching efforts in the field. " Promote production of public events that bring to the public eye the results of computers and music activity and the evolution of musical thought. " Broaden and enhance interest in this field. 5.1.2 The Music Cognition Group The Music Cognition Group(MCG) is a new forum of researchers and musicians interested in music cognition. The forum participants bring to bear a variety of skills, areas of expertise, and frameworks, which we believe are necessary for discussing as complicated a field as music cognition. The MCG aims are to: " Define questions of interest to musicians, for future research. " Discuss current methodologies and suggest new experimental paradigms. " Offer it's participants feedback on ongoing research projects. " Offer a forum for interactions between researchers from: Musicology, Computer Science, Emotion studies, Psychology, Psycholinguistics and Music Education. " Define and suggest methodologies for human modeling of music cognition. " Broaden and enhance interest in this field. 5.1.3 Related Institutes and People We enjoy close collaboration and joint work with researchers from the Musicology department at Hebrew University. Dr. Naftali Wagner, which is works with the author of this report,on modeling Music Cognition with hierachical Neural Nets. Prof. Dalia Cohen and Roni Granot give this year a course in Music Cognition. We also would like to mention here Prof. Jonathan Berger, which is the Director of the Center for Studies in Music Technology at Yale University. Jonathan Berger gave here two talks in the departmental Qulloquium, about his recent work using wavelet for polyphonic pitchtracking, timbre separation, and denoising procedures. Jonathan was our guest for a month in December 1995, and we have worked together on modeling harmonic expectations of the listener. At the same time he taught at the Rubin Academy of Music and Dance in Jerusalem, courses on electroacoustic and Computer Music, Gang 510 ICMC Proceedings 1996

Page  511 ï~~together with Prof. Menachem Zur and Shlomo Dubnov. Recently, we started to investigate the possibilities to integrate Artificial Intelligence modules into the well-known Dmix environment together with Dr. Daniel V. Oppenheim from the computer music center, at IBM T.J Watson research center. Lately, we also started a collaboration with another group from University of Genova, DIST. 3. The group headed by Prof. Antonio Camurri. We try to integrate some ideas taken from Neural Nets and DAI fields, with the Italian group's Interactive Dance/Music Systems. We collaborate and exchange ideas with other universities and institutes in Israelactive in the Computer Music field: " Technion - Prof. Uri Shiinony. " Bar-Ian university - Prof. Eitan Avitsur and Dr.Mira Balaban. " Tel-Aviv university - Prof. David Halperin. 3Lo at ICMC Proceedings 1996 511 Gang