Unified speech/audio codec (USAC) processing windows sequence based mode switching
First Claim
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1. An encoding method for Unified Speech and Audio Codec (USAC), comprising:
- by one or more processor processing a computer executable instruction, when executed;
determines a first window for a previous frame,determines a second window for a current frame,modifies a left portion of the second window based on the first window, when a switching occurs between the previous frame and the current frame, andencodes an input signal of the current frame using the modified second window,wherein the left portion of the second window is a region for overlap-add operation with the first window based on a folding point located at a boundary between the previous frame and the current frame, andwherein the processor modifies a shape of the left portion of the second window and modifies a size of the left portion of the second window, and the input signal is encoded by the processor by performing the overlap-add operation with respect to the second window including the left portion modified based on the first window.
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Abstract
A Unified Speech and Audio Codec (USAC) that may process a window sequence based on mode switching is provided. The USAC may perform encoding or decoding by overlapping between frames based on a folding point when mode switching occurs. The USAC may process different window sequences for each situation to perform encoding or decoding, and thereby may improve a coding efficiency.
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Citations
10 Claims
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1. An encoding method for Unified Speech and Audio Codec (USAC), comprising:
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by one or more processor processing a computer executable instruction, when executed; determines a first window for a previous frame, determines a second window for a current frame, modifies a left portion of the second window based on the first window, when a switching occurs between the previous frame and the current frame, and encodes an input signal of the current frame using the modified second window, wherein the left portion of the second window is a region for overlap-add operation with the first window based on a folding point located at a boundary between the previous frame and the current frame, and wherein the processor modifies a shape of the left portion of the second window and modifies a size of the left portion of the second window, and the input signal is encoded by the processor by performing the overlap-add operation with respect to the second window including the left portion modified based on the first window. - View Dependent Claims (2, 3, 4)
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5. An encoding method for Unified Speech and Audio Codec (USAC), comprising:
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by one or more processor processing a computer executable instruction, when executed; determines a first window for a next frame, determines a second window for a current frame, modifies a right portion of the second window for the current frame based on the first window, when a switching occurs between the current frame and the next frame, and encodes an input signal of the current frame using the modified second window, wherein the right portion of the second window is a region for overlap-add operation with the first window based on a folding point located at a boundary between the current frame and the next frame, and wherein the processor modifies a shape of the right portion of the second window and modifies a size of the right portion of the second window, and the input signal is encoded by the processor by performing the overlap-add operation with respect to the second window including the right portion modified based on the first window. - View Dependent Claims (6, 7, 8)
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9. A decoding method for Unified Speech and Audio Codec (USAC), comprising:
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by one or more processor processing a computer executable instruction, when executed; determines a first window for a previous frame, determines a second window for a current frame, modifies a left portion of the second window for the current frame based on the first window, and decodes an input signal of the current frame using the modified second window, wherein the left portion of the second window is a region for overlap-add operation with the first window based on a folding point located at a boundary between the previous frame and the current frame, and wherein the processor modifies a shape of the left portion of the second based on the first window and modifies a size of the left portion of the second, and the input signal is decoded by the processor by performing the overlap-add operation with respect to the second window including the left portion modified based on the first window.
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10. A decoding method for Unified Speech and Audio Codec (USAC), comprising:
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by one or more processor processing a computer executable instruction, when executed; determines a first window for a next frame, determines a second window for a current frame, modifies a right portion of the second window for the current frame based on the first window, and decodes an input signal of the current frame using the modified second window, wherein the right portion of the second window is a region for overlap-add operation with the first window based on a folding point located at a boundary between the current frame and the next frame, and wherein the processor modifies a shape of the right portion of the second window and modifies a size of the right portion of the second window, and the input signal is decoded by the processor by performing the overlap-add operation with respect to the second window including the right portion modified based on the first window.
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Specification