Abstract: A power conversion system and an auxiliary power supplying method thereof are provided. The power conversion system includes AC and DC ports, an AC-DC converter, a bus capacitor, and a first auxiliary source. The AC port receives or provides an AC voltage, and the DC port provides or receives a DC voltage. The AC-DC converter has an AC terminal and a DC terminal electrically connected to the AC port and the DC port respectively. The bus capacitor is electrically connected to the DC terminal. The first auxiliary source has an input terminal electrically connected to the bus capacitor for receiving a capacitor voltage across the bus capacitor.

Abstract: A virtual-musical-instrument-based audio processing method is provided. In the method, a video is played. A virtual musical instrument is displayed in the video when the virtual musical instrument is matched with at least one musical instrument graphic element in the video. Played audio of the virtual musical instrument is outputted according to interactions with the at least one musical instrument graphic element matched with the virtual musical instrument in the video. Apparatus and non-transitory computer-readable storage medium counterpart embodiments are also contemplated.