Abstract
Disclosed are an apparatus and a method for encoding/decoding for high-frequency bandwidth extension. The encoding apparatus may downsample an input signal perform core-encoding of the downsampled input signal perform frequency conversion of the input signal and perform bandwidth-extension encoding using a basic signal of the input signal of a frequency domain.
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Technologies
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Claim
1. A coding apparatus comprising:a signal classification unit for determining a coding mode of a low-frequency signal of an input signal, based on characteristics of the low-frequency signal of the input signal;a linear prediction coefficient (LPC) coder for extracting an LPC from the low-frequency signal of the input signal, and quantizing the LPC;a code excited linear prediction (CELP) coder for performing CELP coding on an LPC excitation signal of a low-frequency signal of the input signal extracted using the LPC when a coding mode of the low-frequency signal of the input signal is determined as a CELP coding mode;a time-domain (TD) extension coder for performing extension coding on a high-frequency signal of the input signal when CELP coding is performed on the LPC excitation signal;an audio coder for performing audio coding on the LPC excitation signal when a coding mode of the low-frequency signal of the input signal is determined as an audio mode; and a frequency-domain (FD) extension coder for performing extension coding on the high-frequency signal of the input signal when audio coding is performed on the LPC excitation signal.
2. The coding apparatus of claim 1, wherein the FD extension coder performs energy quantization by using a same codebook at different bitrates.
3. The coding apparatus of claim 1, wherein the FD extension coder is configured to:extract energy from the input signal;control the extracted energy; and quantize the controlled energy.
4. The coding apparatus of claim 3, wherein the FD extension coder is configured to extract the energy corresponding to each of frequency bands.
5. The coding apparatus of claim 3, wherein the FD extension coder is configured to control the energy by using an energy control factor estimated from the input signal.
6. The coding apparatus of claim 3, wherein the FD extension coder is configured to vector-quantize the energy by assigning a weight to a low-frequency band of high perceptual importance.
7. The coding apparatus of claim 3, wherein the FD extension coder is configured to quantize the energy by assigning a larger number of bits to a low-frequency band of high perceptual importance than to a high-frequency band.
8. A decoding apparatus comprising:a mode information checking unit for checking mode information of each of frames included in a bitstream;a linear prediction coefficient (LPC) decoder for performing LPC decoding on the frames included in the bitstream;a code excited linear prediction (CELP) decoder for performing CELP decoding on a CELP coded frame, based on a result of the checking;a time-domain (TD) extension decoder for generating a decoded signal of a high-frequency band by using at least one of a result of performing the CELP decoding and an excitation signal of a low-frequency signal;an audio decoder for performing audio decoding on an audio coded frame, based on the result of the checking; and a frequency-domain (FD) extension decoder for performing extension decoding by using a result of performing the audio decoding.
9. The decoding apparatus of claim 8, wherein the FD extension decoder performs inverse quantization of energy by sharing a same codebook at different bitrates.']
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