chaos_kiyono https://blog.hatena.ne.jp/chaos_kiyono/ Ken-Chaos’s Random Notes on R https://chaos-r.hatenadiary.jp/ Fourier Transform To understand power spectra of time series, characteristics of filters, and basic properties of the delta function, it is essential to understand the relationship between the rectangular function and the sinc function. With that in mind, this article discusses the rectangular function and the sinc f… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fchaos-r.hatenadiary.jp%2Fentry%2F2026%2F01%2F23%2F110009" title="Signal Processing Basics (Part 1): The Fourier Link Between the Rectangular Function and the Sinc Function - Ken-Chaos’s Random Notes on R" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> https://cdn-ak.f.st-hatena.com/images/fotolife/c/chaos_kiyono/20260123/20260123105256.png Hatena Blog https://hatena.blog 2026-01-23 11:00:09 rich https://chaos-r.hatenadiary.jp/entry/2026/01/23/110009 1.0 100%