20Part 3By H. P. Hsu, translated by Heihachi Sato (Morikita Publishing Co., Ltd.) More than 45 years ago, when I was still a university student, I found a book in our lab titled Fourier Analysis. Fourier analysis is a method for representing complex waveforms and signals (in the time domain) as a sum of simple sine waves (in the frequency domain). With the advancement of computers, the fast Fourier transform (FFT) algorithm for digital processing was developed, leading to a dramatic expansion in the range of applications for this technique. This method is now widely used in fields like audio and image processing, communications, and physics, and is deeply involved in our daily lives.For a university student in the electronics department of the engineering faculty like me, the book on Fourier analysis should have been a compass for my studies. However, I must admit that I was never a diligent student, so I would only pick up this book when an important exam was imminent. Once the exam was over, I would forget the book entirely.After graduating from university, I joined Rion, and in the autumn of my second year, I was transferred to the engineering department. My first job there was to develop the SA-73 2-chan-nel real-time frequency analyzer, an FFT-type analyzer. At the time, only a few companies in the world were selling FFT-type analyzers. The knowledge essential for the development of this pioneering product was the theory I remembered from that book Books are a source of both knowledge and ideas.What kinds of books does Mr. Iwahashi, our President and CEO, enjoy?In this series, he will introduce a favorite book from his own bookshelf.Basic Engineering Exercise Series 1: on Fourier analysis. I absolutely had to read the book again. I ran to my closet and dug through old textbooks in search of the book Fourier Analysis. I found the book, long forgotten, deep in the closet. Once more, the book became my guide. Since the knowledge in it was necessary for my job, I decided to learn it thoroughly this time and dedicated my weekends to reading the book. In the hope that the content would penetrate my mind, I even kept the book under my pillow while I slept. Perhaps due to my strong desire to understand the content, when I woke up in the morning, I felt I had gained a deeper understanding of Fouri-er analysis. Anyway, as this theory was so closely associated with the wide-ranging tasks I was struggling with, Fourier Analysis became a precious book for me, one to which I would return again and again.Looking back, I now realize that these three lessons have become engraved in my mind. The first is that what you studied when you were a student never goes to waste. The second is that putting a book under your pillow may actually have a certain effect. And third, that there are books out there that truly accom-pany you throughout your life. I imagine I’ll continue turning the pages of this book into the future, thankful to have such a book.FROM MY BOOKSHELFKiyokatsu IwahashiPresident and CEO. Joined Rion in 1979. He has been involved in the devel-opment of measuring and analysis instruments using digital technologies for noise and vibration measurements. He served as Engineering Manager of the S&V Measuring Instrument Department, Executive Officer of the Environmental Instrument Division, and Director of the Technical Develop-ment Center before being appointed President and CEO of Rion in April 2022.Fourier AnalysisRecommendations from our CEO
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