Abstract: Provided are a terminal, a terminal peripheral, a signal transmission system, and a signal sending and receiving method. The terminal includes: a first audio module, which is connected to the USB receptacle in a terminal through an I2S bus channel and is configured to send a signal to be sent to a USB receptacle; the USB receptacle is configured to provide a physical connection interface between the terminal and a terminal peripheral.

Abstract: A locking assembly for facilitating disassembly and assembly of a toilet cover plate on a mounting hole, comprising a bolt, a shaft sleeve in which a nut and a washer are fitted; two sides of the shaft sleeve are respectively provided with a upper guide groove and a lower guide groove, which are all parallel to an axial direction of the shaft sleeve, and bottoms of the upper guide grooves are narrowed to be steps and connect to tops of the lower guide grooves; the washer slidingly engages with the upper guide grooves by a rotating shaft, the nut slidingly engages with the lower guide grooves by guide ribs; the steps shelves the rotating shafts so that the washer is overhanging. The structure is compact and simple, it is convenient for assembly or disassembly, and has a high assembly and disassembly efficiency.

Abstract: Provided are a terminal, a terminal peripheral, a signal transmission system, and a signal sending and receiving method. The terminal includes: a first audio module, which is connected to the USB receptacle in a terminal through an I2S bus channel and is configured to send a signal to be sent to a USB receptacle; the USB receptacle is configured to provide a physical connection interface between the terminal and a terminal peripheral.