Frame loss recovering method, and audio decoding method and device using same
First Claim
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1. A method of recovering a frame loss, the method comprising:
- grouping transform coefficients of at least one frame into a predetermined number of bands among previous frames of a current frame;
deriving an attenuation constant according to a tonality of the bands; and
recovering transform coefficients of the current frame by applying the attenuation constant to the previous frame of the current frame,wherein, in a band having a strong tonality, the attenuation constant is derived on the basis of a correlation between transform coefficients of previous normal frames.
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Abstract
The present invention relates to a frame loss recovering method, an audio decoding method, and an apparatus using the method. A method of recovering a frame loss of an audio signal according to the present invention includes: grouping transform coefficients of at least one frame into a predetermined number of bands among previous frames of a current frame; deriving an attenuation constant according to a tonality of the bands; and recovering transform coefficients of the current frame by applying the attenuation constant to the previous frame of the current frame.
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Citations
11 Claims
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1. A method of recovering a frame loss, the method comprising:
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grouping transform coefficients of at least one frame into a predetermined number of bands among previous frames of a current frame; deriving an attenuation constant according to a tonality of the bands; and recovering transform coefficients of the current frame by applying the attenuation constant to the previous frame of the current frame, wherein, in a band having a strong tonality, the attenuation constant is derived on the basis of a correlation between transform coefficients of previous normal frames. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An audio decoding method comprising:
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determining whether there is a loss in a current frame; if the current frame has lost, recovering a transform coefficient of the current frame on the basis of transform coefficients of previous frames of the current frame; and inverse-transforming the recovered transform coefficient, wherein the recovering of the transform coefficient comprises; grouping transform coefficients of at least one frame into a predetermined number of bands among previous frames of the current frame; deriving an attenuation constant according to a tonality of the bands; and recovering transform coefficients of the current frame by applying the attenuation constant to the previous frame of the current frame, and wherein, in a band having a strong tonality, the attenuation constant is derived on the basis of a correlation between transform coefficients of previous normal frames. - View Dependent Claims (9, 10, 11)
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Specification