System Theory for Mon-stationary Signals via Sampled-Data Control Theory and Its Applications

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360163
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Control engineering
• Research Institution: Kyoto University
• Principal Investigator: YAMAMOTO Yutaka 京都大学, 情報学研究科, 教授 (70115963)
• Co-Investigator(Renkei-kenkyūsha): NAGAHARA Masaaki 京都大学, 情報学研究科, 助教 (90362582)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: サンプル値制御理論 / ディジタルフィルタ / 非定常信号 / 音響・画像処理 / 適応更新則 / ウェーブレット

Outline of Final Research Achievements

This project has advanced the digital filter design method by sampled-data control theory that makes analog performance optimal, proposed by the principal investigator, and further explored real applications. It also successfully derived an adaptation scheme for this, and also applied the algorithm to real problems. As major achievements, we here list a) high-quality restoration from compressed audio sources, b) a prototype processing program for super-sonic restoration for PC music sources, c) super-resolution and smooth　restoration of slanted lines in image processing, inclusive of adaptive processing, d) optimal bandwidth expansion of mobile phone sound sources. Along with the application to custom-made audio processing chips, a new　portable music player has also been developed. A digital filter design　method has also been conducted with a view to application to wavelets.

Free Research Field

システム・制御理論