Method and apparatus for encoding and decoding audio signal using adaptive sinusoidal coding
First Claim
Patent Images
1. A method for encoding an audio signal, comprising:
- receiving a transformed audio signal;
dividing the transformed audio signal into a plurality of sub-bands;
calculating, by a processor, energy of each of the sub-bands;
selecting, by the processor, a predetermined number of sub-bands in order of a large amount of energy of the sub-bands; and
performing sinusoidal coding with regard to the selected sub-bands, wherein the performing sinusoidal coding with regard to the selected sub-bands comprises;
selecting the selected sub-bands as a search track for the sinusoidal coding based on the amount of energy of the sub-bands; and
performing the sinusoidal coding with regard to the search track.
0 Assignments
0 Petitions
Accused Products
Abstract
A method and an apparatus for encoding and decoding audio signals using adaptive sinusoidal coding are provided. The audio signal encoding method includes the steps of dividing a synthesized audio signal into a plurality of sub-bands, calculating the energy of each sub-band, selecting a predetermined number of sub-bands having a relatively large amount of energy from the sub-bands, and performing sinusoidal coding with regard to the selected sub-bands. Application of sinusoidal coding based on consideration of the amount of energy of each sub-band of the synthesized signal improves the quality of the synthesized signal more efficiently.
30 Citations
12 Claims
-
1. A method for encoding an audio signal, comprising:
-
receiving a transformed audio signal; dividing the transformed audio signal into a plurality of sub-bands; calculating, by a processor, energy of each of the sub-bands; selecting, by the processor, a predetermined number of sub-bands in order of a large amount of energy of the sub-bands; and performing sinusoidal coding with regard to the selected sub-bands, wherein the performing sinusoidal coding with regard to the selected sub-bands comprises; selecting the selected sub-bands as a search track for the sinusoidal coding based on the amount of energy of the sub-bands; and performing the sinusoidal coding with regard to the search track. - View Dependent Claims (2, 3)
-
-
4. An apparatus for encoding an audio signal, comprising:
-
an input unit configured to receive a transformed audio signal; a calculation unit configured to divide the transformed audio signal into a plurality of sub-bands, calculate energy of each of the sub-bands, and select a predetermined number of sub-bands in order of a large amount of energy of the sub-bands; and a coding unit configured to perform sinusoidal coding with regard to the selected sub-bands, wherein the coding unit selects the selected sub-bands as a search track for the sinusoidal coding based on the amount of energy of the sub-bands, and performs the sinusoidal coding with regard to the search track. - View Dependent Claims (5, 6)
-
-
7. A method for decoding an audio signal, comprising:
-
receiving a transformed audio signal; dividing the transformed audio signal into a plurality of sub-bands; calculating, by a processor, energy of each of the sub-bands; selecting, by the processor, a predetermined number of sub-bands in order of a large amount of energy of the sub-bands; and performing sinusoidal decoding with regard to the selected sub-bands, wherein the performing sinusoidal decoding with regard to the selected sub-bands comprises; selecting the selected sub-bands as a search track for the sinusoidal decoding based on the amount of energy of the sub-bands; and performing the sinusoidal decoding with regard to the search track. - View Dependent Claims (8, 9)
-
-
10. An apparatus for decoding an audio signal, comprising:
-
an input unit configured to receive a transformed audio signal; a calculation unit configured to divide the transformed audio signal into a plurality of sub-bands, calculate energy of each of the sub-bands, and select a predetermined number of sub-bands in order of a large amount of energy of the sub-bands; and a decoding unit configured to perform sinusoidal decoding with regard to the selected sub-bands, wherein the decoding unit selects the selected sub-bands as a search track for the sinusoidal decoding based on the amount of energy of the sub-bands, and performs the sinusoidal decoding with regard to the search track. - View Dependent Claims (11, 12)
-
Specification