1. A noise signal processing method, comprising: obtaining, by an encoder comprising a processor, a linear prediction coefficient based on a noise signal; filtering, by the encoder, a signal derived from the noise signal to obtain a linear prediction residual signal, wherein the filtering is performed at least based on the obtained linear prediction coefficient; obtaining, by the encoder, a frequency representation of the linear prediction residual signal; obtaining, by the encoder, a spectral envelope to be quantized based on the frequency representation; and quantizing, by the encoder, the spectral envelope to be quantized, wherein the quantized spectral envelope is used for writing into a bitstream for transporting or storing the noise signal.