WO2010134757A2 - 계층형 정현파 펄스 코딩을 이용한 오디오 신호의 인코딩 및 디코딩 방법 및 장치 - Google Patents
계층형 정현파 펄스 코딩을 이용한 오디오 신호의 인코딩 및 디코딩 방법 및 장치 Download PDFInfo
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
- G10L19/0212—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders using orthogonal transformation
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/16—Vocoder architecture
- G10L19/18—Vocoders using multiple modes
- G10L19/24—Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
Definitions
- the present invention relates to a method and apparatus for encoding and decoding an audio signal, and more particularly, to a method and apparatus for encoding and decoding an audio signal using hierarchical sinusoidal pulse coding.
- ITU-T G.729.1 is a representative extension codec, which is a broadband extension codec based on the narrow band codec G.729.
- the codec provides bitstream-level compatibility with G.729 at 8 kbit / s, and a higher quality narrowband signal at 12 kbit / s.
- a wideband signal can be coded with a bit rate expandability of 2 kbit / s, and the quality of the output signal is improved with increasing bit rate.
- extension codec capable of providing an ultra-wideband signal based on G.729.1 is being developed.
- This extension codec can encode and decode narrowband, wideband, and ultra-wideband signals.
- Such an extended codec also uses sinusoidal pulse coding to improve the quality of the synthesized signal.
- Sinusoidal pulse coding can occur over multiple layers. If the number of bits or sinusoidal pulses allocated to sinusoidal pulse coding in the lower layer is variable in units of frames, a method for improving the quality of the synthesized signal in sinusoidal pulse coding in the upper layer is required.
- the present invention provides a method for encoding and decoding an audio signal that can further improve the quality of a synthesized signal by considering lower sinusoidal pulse coding when encoding or decoding an audio signal in an upper layer using hierarchical sinusoidal pulse coding. It is an object to provide a device.
- a method of encoding an audio signal comprising: receiving a converted audio signal, dividing the converted audio signal into a plurality of subbands, and first sinusoidal pulse coding for the plurality of subbands Determining the region of the second sinusoidal pulse coding of the plurality of sub-bands using the pulse coding information of the first sinusoidal pulse coding, and performing the second sinusoidal pulse coding for the performing region And the first sinusoidal pulse coding performing step is variably performed according to the pulse coding information.
- the present invention also provides an audio signal encoding apparatus, comprising: an input unit for receiving a converted audio signal, an operation unit for dividing the converted audio signal into a plurality of subbands, and a first sinusoidal pulse coding for the plurality of subbands A second pulse coding that determines an execution region of the second sinusoidal pulse coding among the plurality of subbands by using the pulse coding unit and the pulse coding information of the first sinusoidal pulse coding, and performs a second sinusoidal pulse coding on the performing region And a first pulse coding unit to variably perform the first sinusoidal pulse coding according to the pulse coding information.
- the present invention also provides a method of decoding an audio signal, the method comprising: receiving a converted audio signal, dividing the converted audio signal into a plurality of subbands, performing a first sinusoidal pulse decoding on the plurality of subbands, Determining an execution region of a second sinusoidal pulse decoding of the plurality of subbands by using pulse coding information of the first sinusoidal pulse decoding, and performing a second sinusoidal pulse decoding on the performing region;
- the sine wave pulse decoding step may be variably performed according to the pulse decoding information.
- the present invention provides an audio signal decoding apparatus, comprising: an input unit for receiving a converted audio signal, an operation unit for dividing the converted audio signal into a plurality of subbands, and a first sinusoidal pulse decoding for the plurality of subbands A second pulse decoding for determining an execution region of a second sinusoidal pulse decoding among a plurality of subbands by using a pulse decoding unit and pulse decoding information of the first sinusoidal pulse decoding, and performing a second sinusoidal pulse decoding on the performing region And a first pulse decoding unit variably performing a first sinusoidal pulse decoding according to the pulse decoding information.
- the advantage of further improving the quality of the synthesized signal by considering the sinusoidal pulse coding of the lower layer have.
- 1 is a structure of an ultra-wideband extension codec that provides compatibility with a narrowband codec.
- FIG. 2 is a block diagram of an audio signal encoding apparatus according to an embodiment of the present invention
- FIG. 3 is a block diagram of an audio signal decoding apparatus according to an embodiment of the present invention.
- 4 is a result of applying sinusoidal pulse coding to 211 MDCT coefficients corresponding to 7-14 kHz through two layers.
- FIG. 5 is a result of hierarchical sinusoidal pulse coding according to an embodiment of the present invention.
- FIG. 6 is a result of hierarchical sinusoidal pulse coding according to another embodiment of the present invention.
- FIG. 8 is a graph showing MDCT coefficients synthesized by the conventional sinusoidal pulse coding method and the sinusoidal pulse coding method according to the present invention, respectively.
- FIG. 9 is a flowchart illustrating a method of encoding an audio signal according to an embodiment of the present invention.
- FIG. 10 is a flowchart illustrating a method of decoding an audio signal according to an embodiment of the present invention.
- FIG. 11 is a block diagram of an audio signal encoding apparatus according to another embodiment of the present invention.
- FIG. 12 is a block diagram of an audio signal decoding apparatus according to another embodiment of the present invention.
- 1 shows the structure of an ultra-wideband extension codec that provides compatibility with narrowband codecs.
- the extension codec has a structure of encoding or decoding a signal of each frequency band after dividing an input signal into several frequency bands.
- the input signal is input to the first order low pass filter 102 and the first order high pass filter 104.
- the first order low pass filter 102 performs filtering and down sampling to output the low band signal A (0-8 kHz) of the input signal.
- the first high pass filter 104 performs filtering and down sampling to output a high band signal B (8-16 kHz) among the input signals.
- the low band signal A output from the first order low pass filter 102 is input to the second order low pass filter 106 and the second order high pass filter 108.
- Secondary low pass filter 106 performs filtering and down sampling to output low-low band signal A1 (0-4 kHz)
- second order high pass filter 108 performs filtering and down sampling to perform low sampling Output the high-band signal A2 (4-8 kHz).
- the low-low band signal A1 is input to the narrowband coding module 110, the low-highband signal A2 to the wideband extension coding module 112, and the highband signal B to the ultra-wideband extension coding module 114, respectively.
- the narrowband coding module 110 operates, only the narrowband signal is reproduced, and when the narrowband coding module 110 and the wideband extension coding module 112 operate, the wideband signal is reproduced.
- the narrowband coding module 110, the wideband extension coding module 112, and the ultra wideband extension coding module 114 operate, an ultra wideband signal is reproduced.
- ITU-T G.729.1 is a broadband extension codec based on G. 729, a narrowband codec.
- the codec provides bitstream level compatibility with G. 729 at 8 kbit / s and a higher quality narrowband signal at 12 kbit / s.
- From 14 kbit / s to 32 kbit / s reproduces a wideband signal with a bit rate expandability of 2 kbit / s, the quality of the output signal is improved as the bit rate increases.
- extension codec that can provide ultra-wideband quality based on G.729.1 is being developed.
- This extension codec can encode and decode narrowband, wideband, and ultra-wideband signals.
- G.729.1 and G.711.1 codecs code narrowband signals with existing narrowband codecs G. 729 and G. 711, and perform MDCT (Modified Discrete Cosine Transform) on the remaining signals. Use the method of coding the MDCT coefficients.
- MDCT coefficients are divided into a plurality of subbands to code gains and shapes of each subband, and MDCT coefficients are generated using an ACELP (Algebraic Code-Excited Linear Prediction) or sinusoidal pulse.
- ACELP Algebraic Code-Excited Linear Prediction
- Code The extension codec generally has a structure that codes information for quality enhancement after first coding information for bandwidth extension. For example, a structure for synthesizing signals in the 7-14 kHz band using gains and shapes of each subband, and then improving the quality of the synthesized signal using ACELP or sinusoidal pulse coding.
- the first layer that provides ultra-wideband quality synthesizes signals corresponding to the 7-14 kHz band using information such as gain and shape.
- sinusoidal pulse coding is applied to improve the quality of the synthesized signal using additional bits. Through this structure, it is possible to improve the quality of the synthesized signal as the bit rate increases.
- sinusoidal pulse coding In general, in sinusoidal pulse coding, the position, magnitude, and sign information of a pulse having the largest magnitude, that is, a pulse having the greatest influence on quality, are coded in a predetermined section. As the interval for searching for these pulses is wider, the amount of calculation increases. Therefore, it is preferable to apply sinusoidal pulse coding to each subframe or subband, rather than to apply sinusoidal pulse coding to the entire frame (in the time domain) or the entire frequency band. Sinusoidal pulse coding requires a relatively large number of bits to transmit a single pulse, but has the advantage of accurately representing a signal that affects the quality of the signal.
- the input signal of the codec has various energy distributions depending on the frequency.
- the energy change according to the frequency is larger than that of the voice signal.
- Signals in high energy subbands have a greater impact on the quality of the synthesized signal.
- Hierarchical sinusoidal pulse coding means performing sinusoidal pulse coding over multiple layers. For example, in the first layer, sinusoidal pulse coding is performed on a first region of all subbands, and in the second layer, sinusoidal pulse coding is performed on a second region of all subbands. In performing such hierarchical pulse coding, it is possible to further improve the quality of the audio signal by considering the frequency band or energy of the signal as mentioned above.
- the present invention when performing hierarchical sinusoidal pulse coding in the extended codec as shown in FIG. 1, by performing sinusoidal pulse coding of a next layer using coding information of a previous layer, audio quality of the synthesized signal can be further improved. Relates to the encoding and decoding of a signal.
- the present invention will be described by referring to audio and audio signals as audio signals.
- FIG. 2 is a block diagram of an audio signal encoding apparatus according to an embodiment of the present invention.
- the audio signal encoding apparatus 202 includes an input unit 204, an operation unit 206, a first pulse coding unit 208, and a second pulse coding unit 210.
- the input unit 204 receives an MDCT coefficient, which is a result of converting the converted audio signal, for example, the MDCT signal.
- the calculating unit 206 divides the converted audio signal input through the input unit 204 into a plurality of sub bands.
- the first pulse coding unit 208 performs first sine wave pulse coding on the plurality of sub bands divided by the calculating unit 206.
- the first pulse coding unit 208 variably performs the first sinusoidal wave coding according to the pulse coding information.
- the pulse coding information may be bit number information allocated to the first sinusoidal pulse coding or information on the number of sinusoids allocated to the first sinusoidal pulse coding.
- performing the first sinusoidal pulse coding 'variably' means coding by varying the number of bits or the number of sinusoids according to the pulse coding information, or the first sinusoidal pulse coding in the order of energy of each subband rather than the frequency band order. Means to do.
- the second pulse coding unit 210 determines a region in which the second sinusoidal pulse coding is to be performed among the plurality of sub bands by using pulse coding information of the first sinusoidal pulse coding. In one embodiment of the present invention, when the pulse coding information is smaller than a specific value, the second pulse coding unit 210 determines the lower band of the plurality of sub bands as an execution region, and the pulse coding information is greater than or equal to the specific value. In the same case, higher bands of the plurality of subbands may be determined as the execution region. In another embodiment of the present invention, the second pulse coding unit 210 may apply the second sinusoidal pulse coding from the lowest frequency band to which the first sinusoidal pulse coding is not applied. The second pulse coding unit 210 performs second sine wave pulse coding on the determined execution region.
- FIG. 3 is a block diagram of an audio signal decoding apparatus according to an embodiment of the present invention.
- the audio signal decoding apparatus 302 includes an input unit 304, an operation unit 306, a first pulse decoding unit 308, and a second pulse decoding unit 310.
- the input unit 304 receives a converted audio signal, for example, an MDCT coefficient that is a result of converting the audio signal by MDCT.
- the calculating unit 306 divides the converted audio signal input through the input unit 304 into a plurality of sub bands.
- the first pulse decoding unit 308 performs first sinusoidal pulse decoding on the plurality of sub bands divided by the operation unit 306.
- the first pulse decoding unit 308 variably performs the first sinusoidal wave coding according to the pulse decoding information.
- the pulse decoding information may be bit number information allocated to the first sinusoidal pulse decoding or information on the number of sinusoids allocated to the first sinusoidal pulse decoding.
- performing 'variable' the first sinusoidal pulse decoding means decoding the number of bits or the number of sinusoids according to the pulse decoding information, or decoding the first sinusoidal pulse in the energy order of each subband rather than the frequency band order. Means to do.
- the second pulse decoding unit 310 determines a region in which the second sinusoidal pulse decoding is to be performed among the plurality of sub bands by using pulse decoding information of the first sinusoidal pulse decoding. In one embodiment of the present invention, when the pulse decoding information is less than a specific value, the second pulse decoding unit 310 determines the lower band of the plurality of sub-bands as the execution region, the pulse coding information is greater than the specific value or In the same case, higher bands of the plurality of subbands may be determined as the execution region. In another embodiment of the present invention, the second pulse decoding unit 310 may apply the second sinusoidal pulse decoding from the lowest frequency band to which the first sinusoidal pulse decoding is not applied. The second pulse decoding unit 310 performs second sine wave pulse decoding on the determined execution region.
- the audio signal encoding apparatus 202 and the audio signal decoding apparatus 302 shown in FIGS. 2 and 3 may include the narrowband coding module 110, the wideband extension coding module 112, or the ultra wideband extension coding module 114 of FIG. 1. Can be included.
- the ultra wideband extension coding module 114 divides MDCT coefficients corresponding to 7-14 kHz into a plurality of sub bands, and obtains an error signal by coding or decoding gains and shapes of each sub band. The ultra wideband extension coding module 114 then performs sinusoidal pulse coding or decoding on the error signal. In this case, it is assumed that the sine wave pulse coding is a hierarchical structure in which bit rate adjustment is possible in 4kbit / s or 8kbit / s units.
- the ultra-wideband extension coding module 114 converts the highband (7-14 kHz) signal into the MDCT region and codes the MDCT coefficients through hierarchical sinusoidal pulse coding. That is, the MDCT coefficient of the high band is divided into a plurality of sub bands, and two sinusoidal pulses are coded per one sub band. In this case, it is assumed that up to 10 sinusoidal pulses can be coded according to a frame in the first layer, and 10 sinusoidal pulses can be fixed in the second layer. In other words, in the first layer, the number of sinusoidal pulses varies from 0 to 10 depending on the frame.
- N represents the number of sinusoidal pulses used when performing sinusoidal pulse coding in the first layer.
- the energy of the voiced sound is located in a relatively low frequency band, and the energy of unvoiced and burst sound is located in a relatively high frequency band.
- most audio signals have a lot of energy below 10 kHz. That is, as shown in FIG. 4, when sinusoidal pulse coding of the second layer is performed irrespective of sinusoidal pulse coding of the first layer, sinusoidal pulse coding is not applied to some bands, particularly a band affecting speech quality. The case occurs, which leads to degradation of the synthesized signal.
- the present invention provides an encoding and decoding method of an audio signal that improves the quality of a synthesized signal by performing sinusoidal pulse coding of the second layer using pulse coding information of the sinusoidal pulse coding of the first layer to overcome such a problem. do.
- FIG. 5 shows a result of hierarchical sinusoidal pulse coding according to an embodiment of the present invention.
- the input unit 204 of FIG. 2 receives an MDCT coefficient.
- the operation unit 206 divides the received MDCT coefficients into a plurality of sub bands as shown in FIG. 5. At this time, one subband has 32 samples.
- the first pulse coding unit 208 performs sinusoidal pulse coding of the first layer.
- the first pulse coding unit 208 performs variable pulse coding using pulse coding information.
- the second pulse coding unit 210 determines a region to perform sinusoidal pulse coding among the plurality of sub bands by using the aforementioned pulse coding information.
- the second pulse coding unit 210 receives, from the first pulse coding unit 208, pulse coding information including bit number information, sine wave number information, sine wave position, magnitude, and sign information allocated to the first sine wave pulse coding. Can be delivered. Referring to FIG. 5, when N is less than 8, the second pulse coding unit 210 performs second sinusoidal pulse coding on a lower band (7-11 kHz), and when N is greater than or equal to 8, an upper band ( 9.75-13.75 kHz) second sinusoidal pulse coding.
- FIG. 6 shows a result of hierarchical sinusoidal pulse coding according to another embodiment of the present invention.
- the second pulse coding unit 210 of the present embodiment performs the second sinusoidal wave coding in the same manner as the second pulse coding unit 210 described with reference to FIG. 5.
- the first pulse coding unit 208 'variably' performs pulse coding in the order of subbands with high energy rather than frequency band order.
- FIG. 7 shows a result of hierarchical sinusoidal pulse coding according to another embodiment of the present invention.
- the first pulse coding unit 208 performs the first sinusoidal wave coding as in the embodiment of FIG. 4.
- One embodiment of the present invention described so far may be similarly applied to decoding as well as encoding.
- FIG. 8 is a graph showing the MDCT coefficients synthesized by the conventional sinusoidal pulse coding method and the sinusoidal pulse coding method according to the present invention, respectively.
- the blue line represents the original MDCT coefficients
- the red line represents the MDCT coefficients encoded and decoded by the conventional method.
- yellow lines represent MDCT coefficients encoded and decoded by the method according to the invention.
- N 0 in the first layer and 10 sinusoidal pulses were coded in the second layer. Therefore, in encoding and decoding according to the present invention, sinusoidal coding or decoding starts at 7 kHz in the second layer.
- a signal having a large energy in a relatively low frequency band which may greatly affect the quality of an audio signal, is well represented when compared with the conventional method.
- FIG. 9 is a flowchart illustrating a method of encoding an audio signal according to an embodiment of the present invention.
- a converted audio signal for example, an MDCT coefficient is received (902).
- the converted audio signal is divided into a plurality of sub bands (904).
- first sinusoidal pulse coding is performed on the divided subbands.
- the first sinusoidal pulse coding variably performs the first sinusoidal pulse coding according to the pulse coding information.
- the pulse coding information may be bit number information allocated to the first sinusoidal pulse coding or information on the number of sinusoids allocated to the first sinusoidal pulse coding.
- performing the first sinusoidal pulse coding 'variably' means coding by varying the number of bits or the number of sinusoids according to the pulse coding information, or the first sinusoidal pulse coding in the order of the energy of each subband rather than the frequency band order. Means to do.
- an area in which the second sinusoidal pulse coding is to be performed among the plurality of subbands is determined (908).
- the pulse coding information is smaller than a specific value
- the lower band of the plurality of sub bands is determined as the execution region
- the pulse coding information is greater than or equal to the specific value
- the upper band of the plurality of sub bands is determined as the performing region.
- the second sinusoidal pulse coding may be applied from the lowest frequency band to which the first sinusoidal pulse coding is not applied.
- second sinusoidal pulse coding is performed on the determined execution region.
- FIG. 10 is a flowchart illustrating a method of decoding an audio signal according to an embodiment of the present invention.
- the converted audio signal for example, the MDCT coefficient is received (1002).
- the converted audio signal is divided into a plurality of sub bands (1004).
- a first sinusoidal pulse decoding is performed on the divided subbands (1006).
- the first sinusoidal pulse decoding variably performs the first sinusoidal pulse decoding according to the pulse decoding information.
- the pulse decoding information may be bit number information allocated to the first sinusoidal pulse decoding or information on the number of sinusoids allocated to the first sinusoidal pulse decoding.
- performing 'variable' the first sinusoidal pulse decoding means decoding the number of bits or the number of sinusoids according to the pulse decoding information, or decoding the first sinusoidal pulse in the energy order of each subband rather than the frequency band order. Means to do.
- the pulse decoding information of the first sinusoidal pulse decoding is used to determine an area in which the second sinusoidal pulse decoding is performed among the plurality of subbands (1008).
- the pulse decoding information is smaller than a specific value
- the lower band of the plurality of subbands is determined as the execution region
- the pulse decoding information is greater than or equal to the specific value
- the upper band of the plurality of subbands is determined as the execution region.
- the second sinusoidal pulse decoding may be applied from the lowest frequency band to which the first sinusoidal pulse decoding is not applied. Then, the second sinusoidal pulse decoding is performed on the determined execution region (1010).
- FIG. 11 is a block diagram of an audio signal encoding apparatus according to another embodiment of the present invention.
- the audio signal encoding apparatus shown in FIG. 11 receives an input signal of 32 kHz, and synthesizes and outputs a wideband signal and an ultra-wideband signal.
- the audio signal encoding apparatus is composed of wideband extension coding modules 1102, 1108, and 1122 and ultra-wideband extension coding modules 1104, 1106, 1110, and 1112.
- the wideband extension coding module, or G.729.1 core codec operates using a 16 kHz signal, while the ultra wideband extension coding module uses a 32 kHz signal.
- Ultra-wideband extension coding is performed in the MDCT domain. Two modes, generic mode 1114 and sinusoidal mode 1116, are used to code the first layer of the ultra wideband extension coding module.
- Whether to use generic mode 1114 or sinusoidal mode 1116 is determined based on the measured tonality of the input signal.
- the higher ultra-wideband layers are provided to the sinusoidal coding units 1118 and 1120 for improving the quality of the high frequency content, or to the wideband signal improving unit 11202 used to improve the perceptual quality of the wideband content. Is coded.
- An input signal of 32 kHz is first input to the down sampling unit 1102 and down sampled at 16 kHz.
- the down sampled 16 kHz signal is input to the G.729.1 codec 1108.
- the G.729.1 codec 1108 performs wideband coding on the input 16 kHz signal.
- the synthesized 32 kbit / s signal output from the G.729.1 codec 1108 is input to the wideband signal improving unit 1122, and the wideband signal improving unit 1122 improves the quality of the input signal.
- the 32 kHz input signal is input to the MDCT unit 1106 and converted into the MDCT domain.
- the input signal converted into the MDCT domain is input to the tonality measurer 1104 and it is determined whether the input signal is tonal.
- the coding mode of the first ultra-wideband layer is defined based on the tonality measurement performed by comparing the logarithmic domain energies of the current frame and the previous frame of the input signal in the MDCT domain.
- the tonality measurement is based on correlation analysis between spectral peaks of the current frame and the past frame of the input signal.
- the input signal is tonal by the tonality information output by the tonality measurer 1104 (1110). For example, if the tonality information is greater than a certain threshold, the input signal is tonal, otherwise it is determined that the input signal is not tonal.
- the tonality information is also included in the bitstream delivered to the decoder. If the input signal is tonal, sinusoidal mode 1116 is used, otherwise generic mode 1114 is used.
- the quality of the coded signal may be improved by the audio encoding method according to the present invention.
- a bit budget allows adding two sinusoids to the ultra-wideband layer of the first 4 kbit / s.
- the starting position of the track to search for the position of the sinusoid to add is selected based on the subband energy of the synthesized high frequency signal.
- the energy of the synthesized sub bands may be calculated as in Equation 1 below.
- k represents a subband index
- k Denotes the energy of the k-th subband.
- synthesized high frequency signal Denotes the synthesized high frequency signal.
- Each subband consists of 32 MDCT coefficients.
- a subband with a relatively large energy is selected as the search track of sinusoidal coding.
- the search track may include 32 locations with a unit size of one. In this case, the search track coincides with the sub band.
- the amplitudes of the two sinusoids are quantized by a 4-bit, one-dimensional codebook, respectively.
- Sinusoidal mode 1116 is used when the input signal is tonal.
- the high frequency signal is, for example, the total number of sinusoids added is 10, 4 in the 7000-8600 Hz frequency range, 4 in the 8600-10200 Hz frequency range, 1 in 10200 At the -11800Hz frequency range, one can be located at the 11800-12600Hz frequency range.
- the sinusoidal coding units 1118 and 1120 improve the quality of the signal output by the generic mode 1114 or the sinusoidal mode 1116.
- the number of sinusoids Nsin added by the sinusoidal coding units 1118 and 1120 depends on the bit budget. Tracks for sinusoidal coding of the sinusoidal coding units 1118 and 1120 are selected based on the subband energy of the synthesized high frequency content.
- the synthesized high frequency content in the 7000-13400 Hz frequency range is divided into eight subbands.
- Each subband is composed of 32 MDCT coefficients, and the subband energies may be calculated as shown in Equation 1, respectively.
- Tracks for sinusoidal coding are selected by finding Nsin / Nsin_track subbands with relatively large energy.
- Nsin_track is the number of sinusoids per track and is set to two.
- the selected Nsin / Nsin_track subbands each correspond to a track used for sinusoidal coding. For example, if Nsin is 4, the first two sinusoids are located in the subband with the largest subband energy, and the remaining two sinusoids are in the second band with the highest energy.
- Track positions for sinusoidal coding vary frame by frame depending on the available bit budget and high frequency signal energy characteristics.
- the starting position of the tracks for sinusoidal coding depends on Nsin. If Nsin is lower than a certain threshold, sinusoidal pulses are located in the lower part of the high frequency signal's frequency domain. If Nsin is greater than or equal to the threshold, most sinusoids are located in the upper part of the high frequency signal's frequency domain.
- the threshold value is defined as eight.
- ten sinusoids are added to the high frequency spectrum as follows. First, six sinusoids each have two sinusoids and are grouped into three tracks located in the frequency band of 7000-9400 Hz or 9750-12150 Hz. The next four sinusoids each have two sinusoids and are grouped into two tracks located in the frequency band 9400-11000 Hz or 12150-13750 Hz.
- the remaining 10 sinusoids are added as follows. First, six sinusoids each have two sinusoids and are grouped into three tracks located in the frequency band of 7800-10200 Hz, 9400-11800 Hz or 8600-11000 Hz. The last four sinusoids each have two sinusoids and are grouped into two tracks located in the frequency band 10200-11800Hz, 11800-13400Hz or 11000-12600Hz.
- Table 1 shows the structure of the sinusoidal track in the generic mode described above, that is, the start position, step size, and track length of the sinusoidal track.
- the first 10 sinusoids are added as follows. First, six sinusoids each have two sinusoids and are grouped into three tracks located in the frequency band between 7000 Hz and 9400 Hz. The next four sinusoids are grouped into two tracks, each with two sinusoids and located in the frequency band between 11000 Hz and 12600 Hz.
- the second ten sinusoids are added as follows. First, four sinusoids each have two sinusoids and are grouped into two tracks located in the frequency band between 9400 Hz and 11000 Hz. The next six sinusoids are grouped into three tracks, each with two sinusoids and located in the frequency band between 11000 Hz and 13400 Hz.
- Table 2 shows the structure of the first 10 sinusoidal sinusoidal tracks in the sinusoidal mode described above, that is, the start position, the section size, and the track length of the sinusoidal track.
- Table 3 shows the structure of the second 10 sinusoidal sinusoidal tracks in the sinusoidal mode described above, that is, the start position, the section size, and the track length of the sinusoidal track.
- FIG. 12 is a block diagram of an audio signal decoding apparatus according to another embodiment of the present invention.
- the audio signal decoding apparatus shown in FIG. 12 receives a wideband signal and an ultra-wideband signal encoded by the encoding apparatus, and outputs it as a 32 kHz signal.
- the audio signal decoding apparatus is composed of wideband extended decoding modules 1202, 1214, 1216 and 1218 and ultra wideband extended decoding modules 1204, 1220 and 1222.
- the wideband extended decoding module decodes the input 16 kHz signal
- the ultra wideband extended decoding module decodes the high frequencies to provide a 32 kHz output.
- Ultra wideband extended decoding is mostly performed in the MDCT domain. Two modes, namely generic mode 1206 and sinusoidal mode 1208, are used to decode the first layer of extension, which depends on the tonality indicator to be decoded first.
- the second layer uses the same bit allocation as the encoder to distribute the bits between the wideband signal enhancement and the additional sinusoids.
- the third ultra-wideband layer is composed of sinusoidal decoding units 1210 and 1212, which improves the quality of high frequency content.
- Fourth and fifth enhancement layers provide broadband signal enhancement. Post-processing is used in the time domain to improve the synthesized ultra-wideband content.
- the signal encoded by the encoding device is input to the G.729.1 codec 1202.
- the G / 729.1 codec 1202 outputs a synthesized signal of 16 kHz, which is input to the wideband signal improving unit 1214.
- the wideband signal improving unit 1214 improves the quality of the input signal.
- the signal output from the wideband signal improving unit 1214 undergoes post-processing by the post-processing unit 1216 and up-sampling by the up-sampling unit 1218.
- a wideband signal needs to be synthesized. This synthesis is performed by the G.729.1 codec 1202. In high frequency signal decoding, 32kbit / s wideband synthesis is used before applying the usual post-processing functions.
- Decoding of the high frequency signal begins by obtaining the synthesized MDCT domain representation from G.729.1 wideband decoding. MDCT domain wideband content is required to decode the high frequency signal of the generic coding frame, where the high frequency signal is constructed through adaptive replication of the coded subbands from the wideband frequency range.
- Generic mode 1206 constructs a high frequency signal by an adaptive subband response.
- two sinusoidal components are added to the spectrum of the first 4 kbit / s ultra-wideband extension layer.
- Generic mode 1206 and sinusoidal mode 1208 utilize similar enhancement layers based on sinusoidal mode decoding techniques.
- the quality of the decoded signal may be improved by the audio decoding method according to the present invention.
- Generic mode 1206 adds two sinusoidal components to the reconstructed overall high frequency spectrum. These sinusoids are represented by position, sign and magnitude. At this time, the starting position of the track for adding sinusoids is obtained from the index of the sub band having a relatively large energy as mentioned above.
- the high frequency signal is generated by a finite set of sinusoidal components.
- the total number of sinusoids added is 10, four in the 7000-8600 Hz frequency range, four in the 8600-10200 Hz frequency range, one in the 10200-11800 Hz frequency range, and one in the 11800- It can be located in the 12600Hz frequency range.
- the sinusoidal decoding units 1210 and 1212 improve the quality of the signal output by the generic mode 1206 or the sinusoidal mode 1208.
- the first ultra-wideband enhancement layer adds ten more sinusoidal components to the high frequency signal spectrum of the sinusoidal mode frame. In the generic mode frame, the number of sinusoidal components added is set according to the adaptive bit allocation between low frequency and high frequency enhancement.
- the decoding processes of the sinusoidal decoding units 1210 and 1212 are as follows. First, the position of the sinusoid is obtained from the bitstream. The bitstream is then decoded to find the transmitted code indices and size codebook indices.
- Tracks for sinusoidal decoding are selected by finding Nsin / Nsin_track subbands with relatively large energy.
- Nsin_track is the number of sinusoids per track and is set to two.
- the selected Nsin / Nsin_track subbands each correspond to a track used for sinusoidal decoding.
- the position indices of the ten sinusoids associated with each corresponding track are first obtained from the bitstream.
- the signs of the ten sinusoids are then decoded.
- the magnitude of the sinusoids (three 8-bit codebook indices) is decoded.
- the signals whose quality is improved by the sinusoidal decoding units 1210 and 1212 undergo post-processing by the inverse MDCT by the IMDCT 1220 and the post-processing unit 1222.
- the output signal of the upsampling unit 1218 and the output signal of the post processor 1222 are added and output as a 32 kHz output signal.
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Abstract
Description
여기서, k는 서브 대역 인덱스를 나타내고, 는 k번째 서브 대역의 에너지를 나타낸다. 또한 는 합성된 고 주파수 신호를 나타낸다. 각각의 서브 대역은 32개의 MDCT 계수들로 이루어진다. 상대적으로 큰 에너지를 갖는 서브 대역이 정현파 코딩의 탐색 트랙으로서 선택된다. 예를 들어, 탐색 트랙은 1의 단위 크기를 갖는 32개의 위치를 포함할 수 있다. 이러한 경우, 탐색 트랙은 서브 대역과 일치한다.
Nsin | 첫 번째 시작 위치 | 두 번째 시작 위치 | 구간 크기 | 길이 |
0, 2 | 280 | 312 | 3 | 32 |
376 | 408 | 2 | 32 | |
4, 6 | 280 | 376 | 3 | 32 |
376 | 472 | 2 | 32 | |
8, 10 | 390 | 344 | 3 | 32 |
486 | 440 | 2 | 32 |
트랙 | 정현파 개수 | 시작 위치 | 구간 크기 | 길이 |
0 | 2 | 280 | 3 | 32 |
1 | 2 | 281 | 3 | 32 |
2 | 2 | 282 | 3 | 32 |
3 | 2 | 440 | 2 | 32 |
4 | 2 | 441 | 2 | 32 |
트랙 | 정현파 개수 | 시작 위치 | 구간 크기 | 길이 |
0 | 2 | 376 | 2 | 32 |
1 | 2 | 377 | 2 | 32 |
2 | 2 | 440 | 3 | 32 |
3 | 2 | 441 | 3 | 32 |
4 | 2 | 442 | 3 | 32 |
Claims (12)
- 변환된 오디오 신호를 입력받는 단계;상기 변환된 오디오 신호를 복수 개의 서브 대역으로 나누는 단계;상기 복수 개의 서브 대역에 대하여 제1 정현파 펄스 코딩을 수행하는 단계;상기 제1 정현파 펄스 코딩의 펄스 코딩 정보를 이용하여, 상기 복수 개의 서브 대역 중 제2 정현파 펄스 코딩의 수행 영역을 결정하는 단계; 및상기 수행 영역에 대하여 상기 제2 정현파 펄스 코딩을 수행하는 단계를 포함하고,상기 제1 정현파 펄스 코딩 수행 단계는 상기 펄스 코딩 정보에 따라 가변적으로 수행되는 오디오 신호의 인코딩 방법.
- 제1항에 있어서,상기 펄스 코딩 정보는상기 제1 정현파 펄스 코딩에 할당된 비트 수 정보 또는 상기 제1 정현파 펄스 코딩에 할당된 정현파 개수 정보인 오디오 신호의 인코딩 방법.
- 제1항에 있어서,상기 제2 정현파 펄스 코딩의 시작 위치 결정 단계는상기 펄스 코딩 정보가 특정 값보다 작은 경우, 상기 복수 개의 서브 대역의 하위 대역을 상기 수행 영역으로 결정하는 단계; 및상기 펄스 코딩 정보가 특정 값보다 크거나 같은 경우, 상기 복수 개의 서브 대역의 상위 대역을 상기 수행 영역으로 결정하는 단계를포함하는 오디오 신호의 인코딩 방법.
- 변환된 오디오 신호를 입력받는 입력부;상기 변환된 오디오 신호를 복수 개의 서브 대역으로 나누는 연산부;상기 복수 개의 서브 대역에 대하여 제1 정현파 펄스 코딩을 수행하는 제1 펄스 코딩부; 및상기 제1 정현파 펄스 코딩의 펄스 코딩 정보를 이용하여, 상기 복수 개의 서브 대역 중 제2 정현파 펄스 코딩의 수행 영역을 결정하고, 상기 수행 영역에 대하여 상기 제2 정현파 펄스 코딩을 수행하는 제2 펄스 코딩부를 포함하고,상기 제1 펄스 코딩부는 상기 펄스 코딩 정보에 따라 가변적으로 상기 제1 정현파 펄스 코딩을 수행하는 오디오 신호의 인코딩 장치.
- 제4항에 있어서,상기 펄스 코딩 정보는상기 제1 정현파 펄스 코딩에 할당된 비트 수 정보 또는 상기 제1 정현파 펄스 코딩에 할당된 정현파 개수 정보인 오디오 신호의 인코딩 장치.
- 제4항에 있어서,상기 제2 펄스 코딩부는상기 펄스 코딩 정보가 특정 값보다 작은 경우, 상기 복수 개의 서브 대역의 하위 대역을 상기 수행 영역으로 결정하고, 상기 펄스 코딩 정보가 특정 값보다 크거나 같은 경우, 상기 복수 개의 서브 대역의 상위 대역을 상기 수행 영역으로 결정하는 오디오 신호의 인코딩 장치.
- 변환된 오디오 신호를 입력받는 단계;상기 변환된 오디오 신호를 복수 개의 서브 대역으로 나누는 단계;상기 복수 개의 서브 대역에 대하여 제1 정현파 펄스 디코딩을 수행하는 단계;상기 제1 정현파 펄스 디코딩의 펄스 코딩 정보를 이용하여, 상기 복수 개의 서브 대역 중 제2 정현파 펄스 디코딩의 수행 영역을 결정하는 단계; 및상기 수행 영역에 대하여 상기 제2 정현파 펄스 디코딩을 수행하는 단계를 포함하고,상기 제1 정현파 펄스 디코딩 수행 단계는 상기 펄스 디코딩 정보에 따라 가변적으로 수행되는 오디오 신호의 디코딩 방법.
- 제7항에 있어서,상기 펄스 디코딩 정보는상기 제1 정현파 펄스 디코딩에 할당된 비트 수 정보 또는 상기 제1 정현파 펄스 디코딩에 할당된 정현파 개수 정보인 오디오 신호의 디코딩 방법.
- 제7항에 있어서,상기 제2 정현파 펄스 디코딩의 시작 위치 결정 단계는상기 펄스 디코딩 정보가 특정 값보다 작은 경우, 상기 복수 개의 서브 대역의 하위 대역을 상기 수행 영역으로 결정하는 단계; 및상기 펄스 디코딩 정보가 특정 값보다 크거나 같은 경우, 상기 복수 개의 서브 대역의 상위 대역을 상기 수행 영역으로 결정하는 단계를포함하는 오디오 신호의 디코딩 방법.
- 변환된 오디오 신호를 입력받는 입력부;상기 변환된 오디오 신호를 복수 개의 서브 대역으로 나누는 연산부;상기 복수 개의 서브 대역에 대하여 제1 정현파 펄스 디코딩을 수행하는 제1 펄스 디코딩부; 및상기 제1 정현파 펄스 디코딩의 펄스 디코딩 정보를 이용하여, 상기 복수 개의 서브 대역 중 제2 정현파 펄스 디코딩의 수행 영역을 결정하고, 상기 수행 영역에 대하여 상기 제2 정현파 펄스 디코딩을 수행하는 제2 펄스 디코딩부를 포함하고,상기 제1 펄스 디코딩부는 상기 펄스 디코딩 정보에 따라 가변적으로 상기 제1 정현파 펄스 디코딩을 수행하는 오디오 신호의 디코딩 장치.
- 제10항에 있어서,상기 펄스 디코딩 정보는상기 제1 정현파 펄스 디코딩에 할당된 비트 수 정보 또는 상기 제1 정현파 펄스 디코딩에 할당된 정현파 개수 정보인 오디오 신호의 디코딩 장치.
- 제10항에 있어서,상기 제2 펄스 디코딩부는상기 펄스 디코딩 정보가 특정 값보다 작은 경우, 상기 복수 개의 서브 대역의 하위 대역을 상기 수행 영역으로 결정하고, 상기 펄스 디코딩 정보가 특정 값보다 크거나 같은 경우, 상기 복수 개의 서브 대역의 상위 대역을 상기 수행 영역으로 결정하는 오디오 신호의 디코딩 장치.
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US20120095754A1 (en) | 2012-04-19 |
KR102105305B1 (ko) | 2020-04-29 |
JP2012527637A (ja) | 2012-11-08 |
US8805680B2 (en) | 2014-08-12 |
KR20180131518A (ko) | 2018-12-10 |
KR20100124678A (ko) | 2010-11-29 |
US20140324417A1 (en) | 2014-10-30 |
EP2434485A2 (en) | 2012-03-28 |
CN102460574A (zh) | 2012-05-16 |
WO2010134757A3 (ko) | 2011-03-03 |
JP5730860B2 (ja) | 2015-06-10 |
EP2434485A4 (en) | 2014-03-05 |
KR101924192B1 (ko) | 2018-11-30 |
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