This paper demonstrates various investigations of our innovative vibration suppression method, called "Digital Self-Powered". The vibration is inhibited by properly switching the status of an electric circuit made up of an inductor and a selective switch connected to a piezoelectric transducer, the control logic calculation and the switching is performed by a digital microprocessor that is driven by electrical energy converted from mechanical vibration energy. Therefore, this vibration suppression system runs without any power supply. This feature of "self-powered" makes this method advantageous in various applications. It is known that some analog techniques can also control the status of an electric circuit adequately and suppress monotone vibrations nicely. However, these analog techniques suppress multimode vibration less-effectively. To realize an ideal vibration suppression system that is both self-powered and effective in suppressing multimode vibration, sophisticated control logic is installed in the digital microprocessor that is driven by the energy converted from vibration energy. In this paper, we describe the detail of our self-powered systems, and experimental results of multimodal vibration suppression using self-powered systems. Moreover, experimental results were highlighted in light of its high damping performance and adaptability in various vibrational conditions.