1. A method for noise generation, comprising: determining an initial value of a reconstructed parameter; determining a random value range based on the initial value of the reconstructed parameter, wherein the process of determining the random value range based on the initial value of the reconstructed parameter comprises: determining a noise parameter increment based on a noise parameter obtained from an SID (Silence Insertion Descriptor) frame; determining a predicted interval length, and determining a floating radius based on the predicted interval length and the noise parameter increment; determining a floating center based on the initial value of the reconstructed parameter and the floating radius; and determining the random value range by taking the floating center as a center of the random value range and taking the floating radius as a radius of the random value range; taking a value in the random value range randomly as a reconstructed noise parameter; and generating noise by using the reconstructed noise parameter.