SIGNAL FOLDING METHOD, AND APPARATUS

A signal folding method and device are provided. In this application, the signal folding device receives an input signal, and performs frequency modulation on a plurality of first analog signals based on the input signal to obtain a plurality of modulated first analog signals, where a frequency difference between two adjacent first analog signals in the plurality of modulated first analog signals is the same. Further, the signal folding device may filter the plurality of modulated first analog signals based on a specified bandwidth to obtain a second analog signal, and demodulate the second analog signal to obtain an output signal. The output signal is a folded signal of the input signal within a target amplitude, and the second analog signal is an analog signal within the bandwidth. The bandwidth corresponds to the frequency difference, and the target amplitude corresponds to the bandwidth. In this solution, an amplitude range of an analog signal can be extended, an implementation is simple and fast, and accuracy of a folded signal can be improved.