Method and apparatus for encoding and decoding audio signal using layered sinusoidal pulse coding

An apparatus for encoding an audio signal, comprising:

• a processor;
• an input unit running on the processor and configured to receive a transformed audio signal;
• an operation unit configured to divide the transformed audio signal into a plurality of sub-bands;
• a first sinusoidal coding unit configured to perform a first sinusoidal coding operation on the sub-bands;
• and
• a second sinusoidal coding unit configured to determine tracks for a second sinusoidal coding operation among the sub-bands based on coding information of the first sinusoidal coding operation, perform the second sinusoidal coding operation on the tracks,
• wherein starting positions of the tracks are depended according to the coding information.

A method for decoding an audio signal, comprising:

• receiving a transformed audio signal;
• dividing the transformed audio signal into a plurality of sub-bands;
• performing a first sinusoidal decoding operation on the sub-bands;
• determining tracks for a second sinusoidal decoding operation among the sub-bands based on decoding information of the first sinusoidal decoding operation;
• and
• performing the second sinusoidal decoding operation on the tracks,
• wherein starting positions of the tracks are depended according to the decoding information.

An apparatus for decoding an audio signal, comprising:

• a processor;
• an input unit running on the processor and configured to receive a transformed audio signal;
• an operation unit configured to divide the transformed audio signal into a plurality of sub-bands;
• a first sinusoidal decoding unit configured to perform a first sinusoidal decoding operation on the sub-bands;
• and
• a second sinusoidal decoding unit configured to determine tracks for a second sinusoidal decoding operation among the sub-bands based on decoding information of the first sinusoidal decoding operation, and perform the second sinusoidal decoding operation on the tracks,
• wherein starting positions of the tracks are depended according to the decoding information.