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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Claim
1-43. (Deleted) 44. A coding apparatus comprising:a signal classification unit for determining a coding mode of an input signal, based on characteristics of the input signal;a code excited linear prediction (CELP) coder for performing CELP coding on a low-frequency signal of the input signal when a coding mode 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 low-frequency signal of the input signal;a frequency transformer for performing frequency transformation on the input signal when the coding mode of the input signal is determined as a frequency-domain (FD) mode; and an FD coder for performing FD coding on the transformed input signal.45. The coding apparatus of claim 44, wherein the FD coder comprises:a normalization coder for extracting energy from the transformed input signal for each frequency band and quantizing the extracted energy;a factorial pulse coder for performing factorial pulse coding (FPC) on a value obtained by scaling the transformed input signal by using a quantized normalization value; and an additional noise information generator for generating additional noise information according to performing of the FPC, wherein the transformed input signal input to the FD coder is a transient frame.46. The coding apparatus of claim 44, wherein the FDcoder comprises: a normalization coder for extracting energy from the transformed input signal for each frequency band and quantizing the extracted energy;a factorial pulse coder for performing factorial pulse coding (FPC) on a value obtained by scaling the transformed input signal by using a quantized normalization value;an additional noise information generator for generating additional noise information according to performing of the FPC; and an FD extension coder for performing extension coding on a high-frequency signal of the transformed input signal, wherein the transformed input signal input to the FD coder is a stationary frame.47. The coding apparatus of claim 46, wherein the FDextension coder performs energy quantization by using a same codebook at different bitrates.48. The coding apparatus of claim 44, wherein a bitstream according to a result of performing the FD coding on the transformed input signal includes previous frame mode information.49. A coding apparatus comprising:signal classification unit for determining a coding mode of an input signal, based on characteristics of the input signal;a linear prediction coefficient (LPC) coder for extracting an LPC from a 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 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
2 when a coding mode of the input signal is determined as an audio mode; and an 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.50. The coding apparatus of claim 49, wherein the FD extension coder performs energy quantization by using a same codebook at different bitrates.51. A decoding apparatus comprising:a mode information checking unit for checking mode information of each of frames included in a 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;a frequency-domain (FD) decoder for performing FD decoding on an FD coded frame, based on the result of the checking; and an inverse frequency transformer for performing inverse frequency transformation on a result of performing the FD decoding.52. The decoding apparatus of claim 51, wherein the FDdecoder comprises:a normalization decoder for performing normalization decoding, based on normalization information included in the bitstream;a factorial pulse coding (FPC) decoder for performing FPC decoding, based on factorial pulse coding information included in the bitstream; and a noise filling performing unit for performing noise filling on a result of performing the FPC decoding.53. The decoding apparatus of claim 51, wherein the FDdecoder comprises:
3 a normalization decoder for performing normalization decoding, based on normalization information included in the bitstream;a factorial pulse coding (FPC) decoder for performing FPC decoding, based on factorial pulse coding information included in the bitstream;a noise filling performing unit for performing noise filling on a result of performing the FPC decoding; and an FD high-frequency extension decoder for performing high-frequency extension decoding, based on the result of performing FPC decoding and a result of performing the noise filling.54. The decoding apparatus of claim 52, wherein the FDdecoder further comprises an FD low-frequency extension coder for performing extension coding on the results of performing the FPC decoding and the noise filling when an upper band value of a frequency band performing FPC decoding is less than an upper band value of a frequency band of a core signal.55. The decoding apparatus of claim 52, wherein the FDhigh-frequency extension decoder performs inverse quantization of energy by sharing a same codebook at different bitrates.56. The decoding apparatus of claim 51, wherein the FD decoder performs FD decoding on an FD coded frame, based on previous frame mode information included in the bitstream.57. 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
4 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.58. The decoding apparatus of claim 57, wherein the FDextension decoder performs inverse quantization of energy by sharing a same codebook at different bitrates.59-101. (Deleted) 102. A coding method comprising:determining a coding mode of an input signal, based on characteristics of the input signal;performing code excited linear prediction (CELP) coding on a low-frequency signal of the input signal when a coding mode of the input signal is determined as a CELP coding mode;performing time-domain (TD) extension coding on a high-frequency signal of the input signal when CELP coding is performed on the low-frequency signal of the input signal;performing frequency transformation on the input signal when the coding mode of the input signal is determined as a frequency-domain (FD) mode; and performing FD coding on the transformed input signal.103. The coding method of claim 102, wherein the performing of the FD coding comprises performing energy quantization by sharing a same codebook at different bitrates.104. The coding method of claim 102, wherein a bitstream according to a result of performing the FD coding on the transformed input signal includes previous frame mode information. 105. A coding method comprising:determining a coding mode of an input signal, based on characteristics of the input signal;extracting a linear prediction coefficient (LPC) LPC from a low-frequency signal of the input signal, and quantizing the LPC;performing code excited linear prediction (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 input signal is determined as a CELP coding mode;performing time-domain (TD) extension coding on a high-frequency signal of the input signal when CELP coding is performed on the LPC excitation signal;performing audio coding on the LPC excitation signal when a coding mode of the input signal is determined as an audio coding mode; and performing frequency-domain (FD) extension coding on the high-frequency signal of the input signal when audio coding is performed on the LPC excitation signal.106. The coding method of claim 105, wherein the performing of the FD extension coding comprises performing energy quantization by sharing a same codebook at different bitrates.107. A decoding method comprising:checking mode information of each of frames included in a bitstream; performing code excited linear prediction (CELP) decoding on a CELP coded frame, based on a result of the checking;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;performing frequency-domain (FD) decoding an FD coded frame, based on the result of the checking; and performing inverse frequency transformation on a result of performing the FD decoding. 108. The decoding method of claim 107, wherein the performing of the FD decoding comprises performing inverse quantization of energy by sharing a same codebook at different bitrates.109. The decoding method of claim 107, wherein the performing of the FD decoding comprises performing the FD decoding on an FD coded frame, based on previous frame mode information included in the bitstream.110. A decoding method comprising:checking mode information of each of frames included in a bitstream; performing linear prediction coefficient (LPC) decoding on the frames included in the bitstream;performing code excited linear prediction (CELP) decoding on a CELP coded frame, based on a result of the checking;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;performing audio decoding on an audio coded frame, based on the result of the checking; and performing frequency-domain (FD) extension decoding by using a result of performing the audio decoding.111. The decoding method of claim 110, wherein the performing of the FD extension decoding comprises performing inverse quantization of energy by sharing a same codebook at different bitrates.112. A computer readable recording medium having recorded thereon a computer program for executing any one of the methods of claims 102 to 111. 113. The coding method of claim 102, wherein the performing of the TD coding comprises:extracting energy from the input signal; controlling the extracted energy; and quantizing the controlled energy.114. The coding method of claim 113, wherein in the extracting of energy, the energy is extracted corresponding to each of frequency bands.115. The coding method of claim 113, wherein in the controlling of the extracted energy, the energy is controlled by using an energy control factor estimated from the input signal.116. The coding method of claim 113, wherein in the quantizing of the controlled energy, the energy is vector-quantized by assigning a weight to a low-frequency band of high perceptual importance.117. The coding method of claim 113, wherein in the quantizing of the controlled energy, the energy is quantized by assigning a larger number of bits to a low-frequency band of high perceptual importance than to a high-frequency band.118. The coding method of claim 105, wherein the performing of the FD coding comprises:extracting energy from the input signal;controlling the extracted energy; and quantizing the controlled energy.119. The coding method of claim 118, wherein in the extracting of energy, the energy is extracted corresponding to each of frequency bands.120. The coding method of claim 118, wherein in the controlling of the extracted energy, the energy is controlled by using an energy control factor estimated from the input signal. 121. The coding method of claim 118, wherein in the quantizing of the controlled energy, the energy is vector-quantized by assigning a weight to a low-frequency band of high perceptual importance.122. The coding method of claim 118, wherein in the quantizing of the controlled energy, the energy is quantized by assigning a larger number of bits to a low-frequency band of high perceptual importance than to a high-frequency band.']
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