Encoding method, apparatus and device and decoding method

An audio encoding apparatus, the apparatus comprising:

• a signal analysis unit configured to analyze signal characteristics of an input frame signal and select a second encoding mode to encode the input frame signal;
• a coding demand estimation unit configured to estimate coding demand values for a preset first encoding mode and the second encoding mode, which are used to encode the input frame signal;
• a mode determination unit configured to determine, from the preset first encoding mode and the second encoding mode based on the coding demand values, an encoding mode for encoding the input frame signal;
• and
• an encoding unit configured to encode the input frame signal using the determined encoding mode.

An encoding system, the system comprising:

• a signal receiving apparatus configured to receive an input frame signal;
• an encoding mode determination apparatus configured to analyze signal characteristics of the input frame signal, select a second encoding mode for encoding the input frame signal, obtain coding demand values for a preset first encoding mode and the second encoding mode which are used to encode the input frame signal, and determine, from the preset first encoding mode and the second encoding mode based on the coding demand values, an encoding mode for encoding the input frame signal;
• an encoding apparatus configured to encode the input frame signal using the determined encoding mode;
• and
• a multiplexing and output apparatus configured to multiplex information of the determined encoding mode and encoded data which are encoded according to the determined encoding mode.