Abstract: The present invention relates to a paper jam sensing and recovery method for a receipt printer, the method enabling accurate measuring and determining of a motor overload state, which is most problematic when jam occurs, and enabling an immediate response if an overcurrent is generated on the basis of a driving current, such that damage to the motor or a driving circuit is fundamentally prevented and, also, paper jam occurring in a peripheral part of a printer cutter can be prevented in advance, thereby blocking product damage.

Abstract: A method of providing services using voice recognition in a POS system includes loading an execution command set for each service subject provided by the POS system for each group; registering item-based voice pattern information on the execution command for each group; detecting operation mode of the POS system and activating a microphone by driving voice recognition mode in response to the detected operation mode; converting the received signal of the activated microphone into digital data, detecting properties of a sound wave from the digital data, and extracting sound wave analysis data from the detecting properties; checking whether the sound wave analysis data has been registered and assigning a service use right to the received signal according to a result of the check; and performing voice recognition conversion on the received signal, searching for an execution command having a maximum likelihood for the resulting data, and performing services corresponding to the retrieved execution command.