Signal encoding

A method for encoding a frame in an encoder of a communication system, said method comprising the steps of:

• calculating a first set of parameters associated with a frame, wherein said first set of parameters comprises filter bank parameters;
• bypassing, in a first stage under certain predetermined conditions associated with the first set of parameters, selection of an encoding method from a plurality of encoding methods;
• calculating a second set of parameters associated with the frame;
• selecting, in a second stage, one of the plurality of encoding methods based on a result of the first stage selection and the second set of parameters;
• and
• encoding the frame using the selected encoding method from the second stage.

An encoder for encoding a frame in a communication system, said encoder comprising:

• a first calculation module configured to calculate a first set of parameters associated with a frame, wherein said first set of parameters comprises filter bank parameters;
• a first stage selection module configured to select one of a plurality of encoding methods based on predetermined conditions associated with the first set of parameters;
• a second calculation module configured to calculate a second set of parameters associated with the frame;
• a second stage selection module configured to select one of the plurality of encoding methods based on the result of the first stage selection module and the second set of parameters;
• and
• an encoding module configured to encode the frame using the selected encoding method from the second stage selection module.

An encoder for encoding a frame in a communication system, said encoder comprising:

• first calculating means for calculating a first set of parameters associated with a frame, wherein said first set of parameters comprises filter bank parameters;
• first selecting means for selecting, in a first stage, one of a plurality of encoding methods based on predetermined conditions associated with the first set of parameters;
• second calculating means for calculating a second set of parameters associated with the frame;
• second selecting means for selecting, in a second stage, one of the plurality of encoding methods based on a result of the first stage selection and the second set of parameters;
• and
• encoding means for encoding the frame using the selected encoding method from the second stage.