Method and apparatus for encoding/decoding audio signal using adaptive LPC coefficient interpolation
First Claim
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1. A method of encoding an audio signal, the method comprising:
- determining a window to be applied to a current frame according to whether a transient section is present in the current frame;
performing windowing by applying the window to the audio signal in the current frame;
outputting a linear predictive coding (LPC) coefficient of the audio signal in the current frame by performing LPC analysis on the audio signal in the current frame; and
interpolating the LPC coefficient of the audio signal in the current frame and an LPC coefficient of the audio signal in an adjacent frame in order to generate an interpolated LPC coefficient if it is determined that the transient section is not present in the current frame, and wherein the LPC coefficient of the audio signal in the current frame and the LPC coefficient of the audio signal in the adjacent frame are not interpolated if the transient section is present in the current frame.
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Abstract
Provided are a method and apparatus for encoding or decoding an audio signal by adaptively interpolating a linear predictive coding (LPC) coefficient. In the method and apparatus of encoding or decoding an audio signal, LPC coefficient interpolation is selectively performed depending on whether a transient section is present in a current frame, thereby preventing noise from occurring when interpolating LPC coefficients in the transient section.
16 Citations
22 Claims
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1. A method of encoding an audio signal, the method comprising:
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determining a window to be applied to a current frame according to whether a transient section is present in the current frame; performing windowing by applying the window to the audio signal in the current frame; outputting a linear predictive coding (LPC) coefficient of the audio signal in the current frame by performing LPC analysis on the audio signal in the current frame; and
interpolating the LPC coefficient of the audio signal in the current frame and an LPC coefficient of the audio signal in an adjacent frame in order to generate an interpolated LPC coefficient if it is determined that the transient section is not present in the current frame, and wherein the LPC coefficient of the audio signal in the current frame and the LPC coefficient of the audio signal in the adjacent frame are not interpolated if the transient section is present in the current frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for encoding an audio signal, the apparatus comprising a processor which implements:
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a window determination unit which determines a window that is to be applied to a current frame according to whether a transient section is present in the current frame; a window application unit which performs windowing by applying the window to the audio signal in the current frame; a linear predictive coding (LPC) analysis unit which outputs an LPC coefficient of the audio signal in the current frame by performing an LPC analysis on the audio signal in the current frame; and an LPC synthesis unit which interpolates the LPC coefficient of the audio signal in the current frame and an LPC coefficient of the audio signal in an adjacent frame in order to generate an interpolated LPC coefficient if a transient section is not present in the current frame, and the LPC synthesis unit does not interpolate the LPC coefficient of the audio signal in the current frame and the LPC coefficient of the audio signal in the adjacent frame if the transient section is present in the current frame. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method of decoding an audio signal, the method comprising:
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determining whether a transient section is present in a current frame which is decoded using a transient section information included in a bitstream; and interpolating a linear predictive coding (LPC) coefficient of an audio signal in the current frame, which is extracted from the bitstream, and an LPC coefficient of an audio signal in an adjacent frame if the transient section is not present in the current frame, and wherein the LPC coefficient of the audio signal in the current frame and the LPC coefficient of the audio signal in the adjacent frame are not interpolated if the transient section is present in the current frame. - View Dependent Claims (17, 18)
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19. An apparatus for decoding an audio signal, the apparatus comprising a processor which implements:
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a transient location determination unit which determines whether a transient section is present in a current frame which is decoded using transient section information included in a bitstream; and a linear predictive coding (LPC) synthesis performing unit which interpolates an LPC coefficient of an audio signal in the current frame, which is extracted from the bitstream, and an LPC coefficient of an audio signal in an adjacent frame if the transient section is not present in the current frame, and wherein the LPC synthesis performing unit does not interpolate the LPC coefficient of the audio signal in the current frame and the LPC coefficient of the audio signal in the adjacent frame if the transient section is present in the current frame. - View Dependent Claims (20, 21, 22)
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Specification