Multiple-Degree of Freedom Cavity Resonator Diary

I had my new year in Istanbul. The first sunrize in Istanbul was beautiful. Recently, I learned more about OpenOffice Math. Until recently, I dis not recognize how OpenOffice Math was useful. I had used Microsoft Equation. I like it, but Microsoft equation was upgraded and it became to me very difficult to handle. I decided not to depend on Microsoft Office, so that I again tried to use OpenOffice, then found that OpenOffice Math was useful! I translated some of my technical documents of multiple degree of freedom cavity resonator application and uploaded. There are two new English documents here. New documents

I recently received inquiry from non-English speaking country. He noted that he was not good at English writing. It is no problem to give me emails in European language other than English. We have translation tools in web site. I can handle italiano and Deutsch a little bit. I will try. Ciao!

Here is myself. I presented three types of MDOF-CR(Multiple-Degree of Freedom Cavity Resonator) applications. Three applications are: 1) Standard MCAP-CR 2) CBS-CR 3) AICC-CR These are true MDOF-CR applications. More detailed information is in Japanese only. I will upload them in English later. When? I am not sure.. These applications have exactly the same appearances as in the left photographs. These applications impressed the attendees because of powerful low frequency response with small 3" full-range drivers (TB W3-881SJ).

Here is Mr. Ishida's system. He is well-known craft master. He brought standard 2 way bass-reflex system. Though his work was standard 2 way, there was no contaminated sound felt to me. I am sorry that there was no proper stands, my work was used as system stand. His standard 2 way regenerated excellent sound. We have to always come back to basics. It was what his work let me know. Mr. Furudate brought 4" co-axial 2 way speaker system. Cabinet type was standard MCAP-CR. Material of cabinet is vinyl pipe. This made its sound more vivid. His system generated vivid sound. It was tuned to fit pops sound rather than classical musics. Frequency range was wide enough from very low (40Hz and lower) to very high (may be 20kHz). Continued Multiple-Degree of Freedom Cavity Resonator Project

I am heading a small group named "Research Institute of Loudspeaker Systems and Related Technologies(RILSRT)". First conference was held on September 23rd, 2010 in Tokyo. It was open conference to public and anyone who wanted to join was able to join the conference. Twenty-six people came to present or just to audit the conference. This is presentation by Mr. Matsu. He is co-founder of this institute. This huge system is aimed to realize acoustic field using one 12" and two 10" full-range drivers for each channel. Its technology was based on NDR (Non-Dimensional Radiation) System developed by Mr. Kono in Japan. Enclosure type is standard MCAP-CR developed by myself.. Acoustic field was truly wondering. Regenerating chamber orchestra, acoustic field was spread not only forward field but also backward field. Size of violin was small enough and did not spread over while using these drivers. It was amazing work. Everyone who presented liked this system. Proble...

I packed some of my speaker systems in order to present at conference of Research Institute for Loudspeaker Systems and Related Trchnologies (RILSRT) held on 23rd of September, 2010. I resumed using my main loudspeaker systems that are tall 5" system in the left photograph. The main system is named TR130c . This system is equipped with Nf5Exciter full-range driver by Feastrex . I again realized completely different world with Feastrex drivers from with Fostex drivers. Listening Jazz Piano Trio ("The Ground" by Tord Gustavsen Trio: ECM 1892 B0004123-02), I felt music itself rather than just high fidelity sound. This was true to Morzart' Violin Concerto, List's Piano Concerto and all other music sources that I own. Feastrex sound is music itself. High frequency sound directly reaches to me without distortion. Nothing is annoying. Thigh I enjoy piano trio with my "CON GIOIA" system with Fostex FE83En drivers, but not as much as with "TR130c" ...

 I am heading a small society named "Research Institute of Loudspeaker Systems and Related Technologies (see link ).  It pursues developing and publishing useful technologies. There are many professional engineers and researchers worldwide; however, no professional has ever got success in multiple degree of freedom cavity resonator area.   Above picture is my memorandum notebooks. I always bring a small notebook in order to record my ideas. I illustrate my multiple degree of freedom models and momentum equations. These notebooks are some of my records of MDOF-CR development. Idea of models, equations, algorithms and hand-written drawings are recorded in these notebooks. I think audio professionals should lead technologies; however, non-professionals are already go ahead from professionals in some area. Therefore my group have reasons of its existence. Multiple-Degree of Freedom Cavity Resonator Project