Multi-mode speech encoding system

A method of encoding a speech signal, the method comprising:

• analyzing each frame of a plurality of frames of the speech signal to determine one or more speech parameters for the speech signal;
• deciding, for each frame of the plurality of frames of the speech signal, based on the one or more speech parameters of the speech signal, to select one of a plurality of encoding modes including a first encoding mode and a second encoding mode for encoding each frame of the plurality of frames of the speech signal;
• encoding each frame of the plurality of frames of the speech signal according to the selected one of the plurality of encoding modes for each frame of the plurality of frames in the deciding, thereby converting the speech signal into an encoded speech;
• wherein the first encoding mode supports a first encoding rate and the second encoding mode supports a second encoding rate, and wherein the first encoding rate is the same encoding rate as the encoding rate.

A speech encoding system for encoding a speech signal, the speech encoding system comprising:

• an encoder processing circuit configured to:
• analyze each frame of a plurality of frames of the speech signal to determine one or more speech parameters for the speech signal;
• decide, for each frame of the plurality of frames of the speech signal, based on the one or more speech parameters of the speech signal, to select one of a plurality of encode modes including a first encoding mode and a second encoding mode for encoding each frame of the plurality of frames of the speech signal;
• encode each frame of the plurality of frames of the speech signal according to the selected one of the plurality of encoding modes for each frame of the plurality of frames, thereby converting the speech signal into an encoded speech;
• wherein the first encoding mode supports a first encoding rate and the second encoding mode supports a second encoding rate, and wherein the first encoding rate is the same encoding rate as the encoding rate.