Signal encoding method and device

A signal encoding device, comprising:

• a first determining unit, configured to, when an encoding manner of a previous frame of a currently-input frame is a continuous encoding manner, predict a comfort noise that is generated by a decoder according to the currently-input frame when the currently-input frame is encoded into a silence descriptor (SID) frame, and determine an actual silence signal, wherein the currently-input frame is a silence frame;
• a second determining unit, configured to determine a deviation degree between the comfort noise determined by the first determining unit and the actual silence signal determined by the first determining unit;
• a third determining unit, configured to determine an encoding manner of the currently-input frame according to the deviation degree determined by the second determining unit, wherein the encoding manner of the currently-input frame comprises a hangover frame encoding manner or an SID frame encoding manner;
• and
• an encoding unit, configured to encode the currently-input frame according to the encoding manner of the currently-input frame determined by the third determining unit.