Signal conversion apparatus and related input system

A signal conversion apparatus is provided. The signal conversion apparatus is utilized for generating at least one output signal to a receiving device according to a plurality of input signals generated by an input device. The signal conversion apparatus includes a determination module and a signal generation module. The determination module receives the input signals and compares the input signals with at least one operation definition entry to generate a determination result. The operation definition entry indicates a relationship between an input signal pattern and a predefined operation. The determination result indicates whether the input signals correspond to the operation definition entry. The signal generation module is coupled to the determination module, and generates the output signal to the receiving device according to the determination result.