WO2002103685A1 - Appareil et procede de codage, appareil et procede de decodage et programme - Google Patents
Appareil et procede de codage, appareil et procede de decodage et programme Download PDFInfo
- Publication number
- WO2002103685A1 WO2002103685A1 PCT/JP2002/005808 JP0205808W WO02103685A1 WO 2002103685 A1 WO2002103685 A1 WO 2002103685A1 JP 0205808 W JP0205808 W JP 0205808W WO 02103685 A1 WO02103685 A1 WO 02103685A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- information
- encoding
- decoding
- quantization
- sub
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
- G10L19/032—Quantisation or dequantisation of spectral components
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
- G10L19/06—Determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients
Definitions
- the present invention relates to an encoding device and a method, a decoding device and a method, and an encoding program and a decoding program.
- the present invention relates to digital data such as an audio signal.
- the present invention relates to an encoding device and method, a decoding device and method, and a decoding device, a decoding device and a method for performing high-efficiency encoding, recording the data on a transmission or recording medium, and receiving or reproducing the decoded data on a decoding side. 2.
- the audio signal on the time axis is divided into a plurality of frequency bands without encoding and encoded.
- a signal on the time axis is converted into a signal on the frequency axis (spectral conversion) and divided into a plurality of frequency bands, that is, a coefficient obtained by spectrum conversion.
- spectral conversion a signal on the frequency axis
- a coefficient obtained by spectrum conversion a signal on the frequency axis (spectral conversion) and divided into a plurality of frequency bands, that is, a coefficient obtained by spectrum conversion.
- a high-efficiency coding method combining the above-described non-blocking frequency band division method and the blocking frequency band division method has been proposed.
- this method for example, after band division is performed by band division coding, a signal of each band is spectrally transformed into a signal on a frequency axis, and a code is produced for each band after the spectrum transformation. Is performed.
- PQF Polyphase Quadrature lter
- IVSSP 83 BOSTON Polyphase Quadrature filters-A new subband coding technique
- Joseph H. RothweilerJ etc.
- the input audio signal is divided into blocks of a predetermined unit time, and discrete Fourier transform (DFT), discrete cosine transform (DCT) is performed for each block. )
- DFT discrete Fourier transform
- DCT discrete cosine transform
- MDCT is described in ⁇ ICASSP 1987, Subband / Transform Coding Usage Filter Bank Designs Based on Time Domain Aliasing Cancellation, JP Pr incen, AB Bradley, Univ. Of Surrey Royal Melbourne Inst, of Tech. '' Details are provided.
- the band in which the quantization noise occurs can be controlled. More efficient encoding can be performed audibly. Further, if the signal components of each band are normalized before quantization, for example, by using the maximum value of the absolute value of the signal components in the band, more efficient encoding can be performed. .
- each frequency band when performing band division is determined in consideration of, for example, human auditory characteristics. That is, generally, for example, an audio signal is divided into a plurality of bands (for example, 32 bands) in a band called a critical band (a critical band) in which the higher the band, the wider the band becomes. There is.
- a predetermined bit allocation is performed for each band, or an adaptive bit allocation (bit allocation) is performed for each band.
- bit allocation an adaptive bit allocation
- bit allocation method for example, a method of allocating bits based on the magnitude of a signal in each band (hereinafter referred to as a first bit allocation 1 'method as appropriate), or using auditory masking
- a method of obtaining a required signal-to-noise ratio for each band and performing fixed bit allocation hereinafter, appropriately referred to as a second bit allocation method.
- the first bit allocation method is described in, for example, Adaptive Transform Coding of Speech Signals, R. Zelinski and P. Noll, IEEE Transactions oi Accousties, Speech and Signal Processing, vol.ASSP-25, No. 4, August 1977 ”and so on.
- the quantization noise spectrum becomes flat and the noise energy is minimized.
- the masking effect is not used for the auditory sense, the actual auditory noise is not optimal.
- the second bit allocation method when energy is concentrated at a certain frequency, for example, even when a sine wave or the like is input, the characteristic value is not so good because the bit allocation is fixed. Does not.
- bits that can be used for bit allocation are divided into a fixed bit allocation pattern that is predetermined for each small block and a bit allocation that depends on the signal size of each block.
- a high-efficiency coding apparatus that makes the division ratio dependent on the signal related to the input signal, that is, for example, that the smoother the spectrum of the signal, the larger the division ratio into the fixed bit allocation pattern Has been proposed.
- this method when energy is concentrated in a particular spectrum, such as a sine wave input, many bits are allocated to a block including the spectrum, thereby making the entire signal pair. Noise characteristics can be dramatically improved. Generally, sudden Since the human hearing is extremely sensitive to signals having sharp spectral components, improving the signal-to-noise characteristics as described above merely improves the numerical values measured. It is also effective for improving the sound quality of hearing.
- M independent real number data can be obtained by performing conversion using a time block consisting of M samples.
- one block usually overlaps with the adjacent blocks by a predetermined number M1 of samplers, so that DFT or DCT is used.
- M real data is quantized and encoded on average for (M-Ml) samples.
- MDCT is used as a method of converting signals on the time axis into a spectrum
- M independent real numbers are obtained from 2 M samples overlapping M blocks with the adjacent blocks. Data is obtained. Therefore, in this case, M average data is quantized and encoded for M samples on average.
- the waveform signal obtained by performing the inverse transform in each block is added to the code obtained by using the MDCT as described above while causing the blocks to interfere with each other, so that the waveform signal is reproduced. Be composed.
- quantization precision information which is information indicating a quantization step when performing quantization
- normalization information which is information indicating a coefficient used to normalize each signal component
- ID0 / IEC 11172-3: 1993 (E), 1993 describes a high-efficiency coding scheme in which the number of bits representing quantization accuracy information is set differently depending on the band. According to this, it is standardized that the number of bits representing the quantization accuracy information becomes smaller as the frequency band becomes higher.
- FIG. 1 shows an example of a configuration of a conventional encoding apparatus 100 that encodes an audio signal by dividing a frequency band, for example.
- An audio signal to be encoded is input to the band division unit 101, and is divided into, for example, four frequency band signals.
- the band division unit 101 can perform band division using a filter such as the above-described QMF or PQF, and also performs spectrum conversion such as MDCT and obtains a spectrum obtained as a result. By grouping the vector signals for each band, band division can be performed.
- each band (hereinafter, appropriately referred to as an encoding unit) when the audio signal is divided by the band division unit 101 is uniform or may not match the critical bandwidth or the like. It may be uniform. Also, in FIG. 1, the audio signal is divided into four encoding units, but the number of encoding units is not limited to this.
- a signal decomposed into four coding units (hereinafter, each of the four coding units is referred to as a first to a fourth coding unit as appropriate) is used for a predetermined time block.
- Each frame is supplied to the quantization accuracy determination unit 103. Further, the signals of the first to fourth encoding units are also supplied to normalization units 102 i to 102 4 , respectively.
- the normalizers 102 2 i to 102 4 extract the signal having the largest absolute value from each signal component constituting each of the input first to fourth encoding cut signals.
- the coefficient corresponding to the value is the normalization coefficient of the first to fourth coding units.
- the normalization unit 1 0 2 t ⁇ 1 0 2 4 each signal Ingredients constituting the signal of the first to fourth encoding Yunitto is, first to fourth code Kayu - Tsu City of normal Normalized by the value corresponding to the conversion coefficient (Divided). Therefore, in this case, the normalized data obtained by normalization has a value in the range of 1.1 to 1.0.
- the normalized data are output from the normalization unit 1 0 2 1 0 2 4 to the quantization unit 1 0 4 t ⁇ 1 0 4.
- the normalization coefficients of the first to fourth encoding units are output to the multiplexers 105 from the normalization units 102 to 102.
- Quantizers 104 to! 104 The normalizers 102 to t 102 supply the normalized data of the first to fourth encoding units, respectively, as well as the quantization.
- the precision determination unit 103 also supplies quantization precision information for instructing a quantization step when quantizing the normalized data of the first to fourth encoding units. That is, based on the signals of the first to fourth encoding units from the band division unit 101, the quantization accuracy determination unit 103 receives the normalized data of the first to fourth encoding units. A quantization step for quantizing each is determined. Then, the quantization accuracy information of the first to fourth encoding units corresponding to the quantization step is output to the quantizers 104 i to 104 4 , respectively, and the multiplexers 105 are also output. Output.
- quantizing the normalized data of the first to fourth encoding Yunitto is, corresponding to the quantization accuracy information of the first to fourth encoding Yunitto
- the quantized coefficients of the first to fourth encoding units obtained by being quantized in the step are output to the multiplexer 105.
- the quantization coefficients, quantization accuracy information, and normalization information of the first to fourth encoding units are encoded as necessary, and then multiplexed. Then, the encoded data obtained as a result is transmitted via a transmission path or recorded on a recording medium (not shown).
- FIG. 2 shows an example of a configuration of a decoding device 120 that decodes encoded data output from the encoding device 100 having the above configuration.
- coded data is input to a demultiplexer 121 and decoded, and the first to fourth codes are decoded.
- quantization information of the quantization unit, quantization accuracy information, and normalization information are sent to the signal component constituent units 122 2 i to l 224 corresponding to the respective coding units. Supplied.
- the quantization coefficient of the first encoding unit is inversely quantized in a quantization step corresponding to the quantization accuracy information of the first encoding unit, whereby This is the normalized data of the first encoding unit. Further, the signal component configuration unit 122 i multiplies the normalized data of the first encoding unit by a value corresponding to the normalization information of the first encoding unit. The signal of the first encoding unit is decoded and output to band combining section 123.
- Similar processing is also the signal component constructing unit 1 2 2 2 2 to 1 2 2 4 is carried out, thereby, is output first to fourth been decoded signal coding Yunitto the band combining section 1 2 3 .
- the band synthesizing unit 123 the signals of the first to fourth encoding units are band-synthesized, whereby the original audio signal is restored.
- the encoded data supplied (transmitted) from the encoding device 100 in FIG. 1 to the decoding device 120 in FIG. 2 includes quantization accuracy information and is used in the decoding device.
- the auditory model can be set arbitrarily.
- the encoding device can freely set the quantization step for each encoding unit, and the decoding device can be changed in accordance with the improvement of the arithmetic capability of the encoding device and the refinement of the auditory model.
- the decoding device determines the quantization accuracy information from the normalization information, for example. Since the relationship between the quantization accuracy information is determined, there is a problem that it will be difficult to introduce quantization accuracy control based on a more advanced auditory model in the future. Also, if there is a range in the compression rate to be realized, it is necessary to determine the relationship between the normalization information and the quantization accuracy information for each compression rate.
- the present invention has been proposed in view of such a conventional situation, and allows an encoding device to freely set a quantization step, and an audio signal or the like to be directly encoded.
- Codes of sub-information such as quantization accuracy information and normalization information which are not the target of direct encoding and encoding information (encoding apparatus that can improve the efficiency of decoding and its method, decoding apparatus, and
- An object of the present invention is to provide a method, an encoding program and a decoding program.
- An encoding device is an encoding device that encodes main information that is directly subjected to encoding of audio and video signals or video signals and sub-information that is not directly subjected to encoding.
- Rough shape calculating means for calculating rough shape information
- rough shape coding means for quantizing and coding the rough shape information
- error calculating means for calculating a quantization error
- losing information on the quantization error Error coding means for performing lossless coding without loss, the rough information coded by the rough coding means and the quantization error coded by the error coding means. Is output.
- Such an encoding device when encoding the sub-information of the audio and / or video signal, quantizes and encodes the outline information of the sub-information, and also eliminates the quantization error without losing the information. Encode losslessly.
- the encoding method according to the present invention is an encoding method for encoding main information, which is a direct encoding target of an audio and / or video signal, and sub-information which is not a direct encoding target, A rough calculation step of calculating the rough information of the sub information, a rough coding step of quantizing and coding the rough information, an error calculating step of calculating a quantization error, and the quantization error
- the decoding device converts the encoded audio signal and the ⁇ or video signal.
- the encoding device encodes the outline information about the sub-information that is not directly to be encoded, and the quantization error in encoding the outline information loses the information.
- the information processing apparatus includes a general shape decoding unit for decoding shape information, and a synthesizing unit for synthesizing the decoded quantization error and the general shape information.
- Such a decoding device when encoding the sub-information of the audio and Z or video signals in the encoding device, quantizes and encodes the outline information of the sub-information, and eliminates the quantization error without losing the information.
- the lossless encoded sub information is input, and the quantization error of the sub information and the outline information are decoded and combined.
- the decoding method in the decoding method for decoding an encoded audio signal and a video signal or a video signal, outline information about sub-information that is not directly encoded by an encoding device is encoded.
- This is a decoding method for inputting and decoding the outline information and the quantization error, which are encoded without loss of the quantization error when encoding the outline information, without losing the information.
- An error decoding step of decoding the quantization error of the sub information a rough decoding step of decoding the rough information of the sub information, and a synthesis of combining the decoded quantization error and the rough information. And a process.
- the encoding device when the encoding device encodes the sub information of the audio and / or video signal, the outline information of the sub information is quantized and encoded, and the quantization error is reduced without losing the information. Lossless encoded sub-information is input, and the quantization error of the sub-information and the outline information are decoded and combined.
- the encoding program according to the present invention is an encoding program for encoding main information that is directly encoded with an audio and / or video signal and sub-information that is not directly encoded with audio data.
- the rough information encoded in the rough encoding step and the quantization error encoded in the error encoding step are provided. Is output.
- Such an encoding program encodes audio and / or video signal side information.
- the outline information of the sub information is quantized and encoded, and the quantization error is encoded losslessly without losing information.
- the decoding program according to the present invention is a decoding program for decoding an encoded audio signal and / or video signal, wherein the outline information about the sub-information that is not directly encoded by the encoding device is encoded.
- Such a decoding program quantizes and encodes the rough information of the sub-information when encoding the sub-information of the audio and Z or video signals in the encoding device, and eliminates the quantization error without losing the information.
- the losslessly encoded sub information is input, and the quantization error of the sub information and the outline information are decoded and combined.
- FIG. 1 is a diagram illustrating a configuration of a conventional encoding device.
- FIG. 2 is a diagram illustrating a configuration of a conventional decoding device.
- FIG. 3 is a diagram illustrating the configuration of the encoding device according to the present embodiment.
- FIG. 4 is a diagram illustrating a conceptual configuration of a quantization accuracy information encoding unit in the encoding device.
- - Figure 5 is a flowchart explaining the operation of the outline extraction unit of the quantization accuracy information encoding unit.
- FIG. 6 is a flowchart for explaining the operation of the external quantization unit of the quantization accuracy information encoding unit.
- FIG. 7 is a flowchart for explaining the operation of the residual signal calculation unit of the quantization accuracy information encoding unit.
- FIG. 8 is a flowchart for explaining the operation in the residual signal encoding unit of the quantization accuracy information encoding unit.
- FIG. 9 is a diagram illustrating a specific example of compression of quantization accuracy information in the quantization accuracy information encoding unit.
- FIGS. 1OA to 1OC are diagrams illustrating a specific example of compression of quantization accuracy information in the same quantization accuracy information encoding unit, and FIG. 10A shows quantization accuracy information and its average value.
- FIG. 10B shows the quantization accuracy information and the quantization outline vector, and
- FIG. 10C shows the quantization accuracy information residual signal.
- FIG. 11 is a view for explaining an example of a variable-length code string table for coding the quantization accuracy information residual signal.
- FIG. 12 is a diagram illustrating a specific example of compression of the normalization information in the normalization information encoding unit.
- FIGS. 13A to 13C are diagrams illustrating a specific example of compression of the normalized information in the normalized information encoding unit, and FIG. 13A illustrates the normalized information and its average value, FIG. 13B shows the normalized information and the quantization outline vector, and FIG. 13C shows the normalized information residual signal.
- FIG. 14 is a diagram illustrating an example of a variable-length code string table for encoding a normalized information residual signal.
- FIG. 15 is a diagram illustrating an example of an encoding device having an encoding unit that performs encoding in another encoding format.
- FIG. 16 is a diagram illustrating the configuration of the decoding device according to the present embodiment.
- FIG. 17 is a diagram illustrating a conceptual configuration of a quantization accuracy information decoding unit in the decoding device.
- BEST MODE FOR CARRYING OUT THE INVENTION the present invention is applied to an encoding device and a decoding device that transmit an audio signal or the like after performing high-efficiency encoding and receiving the decoded signal on the decoding side. It is a thing. In the following, description will be made assuming that the audio signal is encoded with high efficiency. However, the present invention is not limited to this, and may be a video signal, for example.
- FIG. 3 shows a configuration of an encoding device 10 according to the present embodiment.
- an audio signal to be encoded is input to a band division unit 11, and is divided into, for example, signals in four frequency bands.
- the band division unit 11 can perform band division using a filter such as a QMF (Quadrature Miller Filter) or a PQF (Polyphase Quadrature Filter). It is also possible to perform band division by performing a spectrum conversion such as a Direc- ture Coin- sine Transformation (Ion), and grouping the resulting spectrum signals by band.
- a filter such as a QMF (Quadrature Miller Filter) or a PQF (Polyphase Quadrature Filter). It is also possible to perform band division by performing a spectrum conversion such as a Direc- ture Coin- sine Transformation (Ion), and grouping the resulting spectrum signals by band.
- a filter such as a QMF (Quadrature Miller Filter) or a PQF (Polyphase Quadrature Filter).
- a spectrum conversion such as a Direc- ture Coin- sine Transformation (Ion)
- each band (hereinafter, referred to as an encoding unit as appropriate) when the audio signal is divided by the band division unit 11 may be uniform or may be made non-uniform so as to match the critical bandwidth. You may. Also, the audio signal is divided into four encoding units, but the number of encoding units is not limited to this.
- the signal decomposed into four coding units (hereinafter, as appropriate, the four coding units are referred to as first to fourth coding units) is converted into a quantized signal for each predetermined time block (frame). It is supplied to the conversion accuracy determination unit 13. Further, the signal of the first to fourth encoding units are also normalized unit 1 2 to 1 2 4, are supplied.
- each signal Ingredients constituting the signal of the first to fourth encoding Yuni' preparative corresponds to the normalization coefficients of the first to fourth encoding Yunitto It is normalized by dividing each value. Therefore, in this case, the normalized data obtained by the normalization has a value in the range of 1.1 to 1.0.
- the normalized data is their respective output to the quantization unit 1 4 t ⁇ 1 4 4 from the normalization unit 1 2 i ⁇ 1 2 4. Also, the normalization coefficients of the first to fourth encoding units are 2 i to l 2 4 is outputted to the normalization information encoding unit 1 6 from each, after being encoded by a method described later, are output to the multiplexer 1 7.
- the quantizer 1 4 to 1 4 4, normalizing unit 1 2 t ⁇ 1 2,! Each of them supplies the normalized data of the first to fourth encoding units, and also quantizes the normalized data of the first to fourth encoding units from the quantization accuracy determination unit 13. Quantization accuracy information for instructing a quantization step at the time of performing is also supplied.
- the quantization accuracy determination unit 13 sets each of the normalized data of the first to fourth encoding units. A quantization step for quantizing the data is determined. Then, the quantization step information of the first to fourth encoding units corresponding to the quantization Sutetsu flop, and outputs each to the quantization unit 1 4 t ⁇ 1 4 4, quantization accuracy information encoding unit Also output to 15.
- the quantization accuracy information encoding unit 15 encodes the quantization accuracy information as described later, and outputs the encoded information to the multiplexer 17.
- the quantization coefficients of the first to fourth coding units obtained as a result are output to the multiplexer 17.
- the multiplexer 17 encodes the quantization coefficients of the first to fourth encoding units, and encodes the quantization accuracy information encoded by the quantization accuracy information encoding unit 15 and the normalized information. It is multiplexed with the encoded normalization information in section 16.
- the encoded data obtained as the output of the multiplexer 17 is transmitted via a transmission path or recorded on a recording medium (not shown).
- encoding apparatus 10 provides audio signal as main information to be directly encoded and quantization accuracy information as sub-information not to be directly encoded. And normalization information are separately encoded.
- FIG. 4 shows a conceptual configuration of the above-described quantization accuracy information encoding unit 15. Note that although the number of coding units in FIG. 3 was four, the following description will be made assuming that the number of coding units is 12.
- the schematic shape extraction unit 20 Quantization accuracy information for each quantization unit is input, its outline is extracted, and supplied to the outline encoder 21.
- the rough shape coding unit 21 quantizes and codes the rough shape information of the extracted quantization accuracy information. Further, the rough shape coding unit 21 supplies the coded rough shape information to the residual signal calculation unit 22 and also to the multiplexer 17 of FIG. 3 as quantization accuracy information.
- the residual signal measuring unit 22 calculates the quantization error in the approximate encoding unit 21 and supplies the result to the residual signal encoding unit 23.
- the residual signal encoding unit 23 encodes the quantization error supplied from the residual signal meter unit 22 and supplies the same to the multiplexer 17 of FIG. 3 as quantization accuracy information.
- FIG. 5 shows the processing in the schematic shape extraction unit 20 of FIG.
- i is the value of the counter
- IDWL is the quantization accuracy information
- shape is the representative value of the quantization accuracy information
- M is the number of unit quantization units that combine the quantization accuracy information when calculating the representative value.
- the value of M may be determined as long as matching between the encoding side and the decoding side is obtained, and may be a fixed value or a variable value. In Fig. 5, fixed values are used as an example.
- step S1 the value of the counter i is initialized to zero.
- step S2 a representative value of the quantization accuracy information is calculated for each unit quantization unit number M.
- the representative value a maximum value, an average value, and the like are generally used.
- step S3 the value of the counter i is increased by one.
- step S4 it is determined whether or not the value of M * i is less than 12 which is the total number of quantization cuts. If the value of M * i is less than 12, the process returns to step S2 and continues. If the value of M * i is equal to or greater than 12 in step S4, the process ends.
- the outline of the quantization accuracy information extracted as described above is the outline code shown in Fig. 4. Quantization and encoding are performed in the transform unit 21.
- FIG. 6 shows a flowchart of the quantization and encoding of the outline of the quantization accuracy information.
- i is the value of the counter
- shape is the approximate vector
- qshape (i) is the quantized approximate vector at the i-th index
- err is the approximate vector and the quantized approximate vector.
- Error (distance) min is the minimum value of the error
- index is the index of the approximate vector quantization ilft
- CB size is the codebook size (the number of indexes) of the quantization approximate vector, respectively. ing.
- step S11 the minimum error value min is initialized as the distance between the approximate vector shae and the quantized approximate vector qshape (0), and the index of the quantized approximate vector inde X Is initialized to 0.
- the quantized approximate shape vector qshape is learned and created in advance and stored as a codebook.
- step S12 the value of the force counter i is initialized to 1, and in step S13, the quantization error of the approximate vector shape and the quantized approximate vector qshape (i) is calculated, and rr is determined. calculate.
- step SI4 it is determined whether or not the quantization error err is smaller than the minimum error value min. If the quantization error e rr is less than the minimum error value m i ⁇ , the process proceeds to step S15, where the quantization error e r r is substituted for the minimum quantization error value m in, and i is substituted for the quantization value index e ind e X. In step S14, if the quantization error err is not less than the minimum error value min, the process proceeds to step S16.
- step S16 the value of the power counter i is incremented by one, and in step S17, it is determined whether or not the value of the power counter i is smaller than the codebook size CBsize. If the value of the counter i is smaller than the code book size C B size, the process returns to step S 13 to continue. In step S17, if the value of the counter i is not smaller than the code puck size CB size, then in step S18, the quantization value index index is encoded, and the processing ends.
- the approximate encoding unit 21 shown in FIG. 4 calculates the error (distance) between the quantized approximate vector and the approximate vector in each index of the codepook for each index, and the error is calculated as follows. Encode the smallest index.
- the residual signal calculator 22 shown in FIG. 4 calculates the residual signal of the quantization accuracy information as shown in FIG.
- I DWL is quantization accuracy information
- qshape is a quantization approximate vector
- index is an index of the quantization approximate vector
- r IDWL is the quantization accuracy.
- the information residual signal, M represents the number of unit quantization units that combine the quantization accuracy information.
- step S21 the value of the counter i is initialized to 0, and in step S22, the value of the counter j is initialized to 0.
- step S23 a quantization accuracy information residual signal is calculated.
- the residual signal of the quantization accuracy information is obtained by subtracting the value of the quantized approximate vector corresponding to the index coded by the approximate encoder 21 shown in FIG. 4 from the quantization accuracy information IDWL.
- step S24 the value of the counter; j is increased by one.
- step S25 it is determined whether the value of j is less than M. If the value of j is less than M, the process returns to step S23 to calculate the value of the quantized information residual signal. In step S25, if the value of j is not less than M, the process proceeds to step S26, and the value of the counter i is increased by one.
- step S27 it is determined whether or not the value of M * i is less than 12 which is the total number of quantization units. If the value of M * i is less than 12, the process returns to step S22 and continues. In step S27, if the value of M * i is not less than 12, the process ends.
- the quantization accuracy information residual signal calculated in this way is encoded in the residual signal encoding unit 23 shown in FIG. 4 as shown in FIG.
- i represents a power counter value
- r IDWL (i) represents a quantization accuracy information residual signal.
- step S31 the value of the counter i is initialized to 0, and then, in step S32, r IDWL (i) is encoded. At this time, if a variable-length code sequence table is prepared and coding is performed using the table, coding can be performed efficiently. Subsequently, in step S33, the value of the counter i is incremented by 1, and in step S34, it is determined whether or not the value of the counter i is less than 12 which is the total number of quantization units. If the value of the counter i is less than 12 which is the total number of quantization units, Return to step S32 and continue the processing. In step S34, if the value of the counter i is not less than 12 which is the total number of quantization units, the process ends.
- the quantization accuracy information can be efficiently compressed.
- the number of unit quantization units M that combine ii-quantization accuracy information is set to 3 ', and the quantization accuracy information is grouped by three, and the average value is obtained as a representative value.
- IDWL unit quantization accuracy information
- the quantization accuracy information is coded with 3 bits.
- quantization accuracy information for each quantization unit (QU) is given as shown in FIG. 10A. Since the quantization precision information of the quantization unit numbers 0 to 2 is 7, 7, and 6, respectively, the representative value is 7, which is the average value. When this is obtained for all quantization precision information, the approximate vector is a four-dimensional vector (7, 4, 2, 1, 1).
- the quantization accuracy information residual signal (rIDWL) is obtained from the quantization outline vector and the quantization accuracy information. That is, the quantization accuracy information residual signal is obtained by subtracting the value of the quantization outline vector from the quantization accuracy information.
- the residual signal of the quantization accuracy information is as shown in FIG. 10C.
- the number of bits is 19 bits. Since the index of the quantized outline vector shown in Fig. 9 is represented by 4 bits, the number of bits of the quantized precision information after encoding is a total of 23 bits. In the case of non-compression, 36 bits are required, and it is possible to compress 13 bits by using the method of this embodiment. Become.
- variable length coding may be performed on the difference value in the frequency direction of the power quantization accuracy information residual signal obtained by performing the variable length coding on the quantization accuracy information residual signal. That is, the quantization accuracy information residual signal and the normalized information residual signal described later often have similar values between adjacent quantization units, between adjacent channels, and between adjacent times.
- the difference value is calculated, the probability of occurrence of the difference is greatly biased, and the probability particularly near the difference value 0 increases. Therefore, the number of coded bits can be reduced by assigning a short code to a difference value having a high appearance ratio.
- variable length coding various methods other than using variable length coding can be used. For example, since the quantization accuracy information residual signal often has a large value in the low frequency range and a small value in the high frequency range, the value in the low frequency range is reduced or the value in the high frequency range is reduced. By assigning weights that are easy to use, the dynamic range in the entire band can be narrowed, and thus, encoding with a small number of bits can be performed. In addition, since the information distribution range of the quantization accuracy information residual signal is often narrow in a quantization unit over a certain band, the boundary quantization unit number should be encoded into ⁇ IJ. Thus, information above the boundary band can be encoded with a small number of bits.
- the gain and the shape may be separately specified. This makes it possible to encode more efficiently with a small-sized code book.
- quantization accuracy information has been described above, but compression can be performed by the same method in the case of normalization information.
- the normalization information encoding unit 16 shown in FIG. 3 extracts an outline of the normalization information for each quantization unit, and obtains an outline of the extracted normalization information.
- the shape is quantized and encoded and output to the multiplexer 17 in FIG.
- the quantization error is encoded and output to the multiplexer 17 of FIG. 3 as normalization information.
- the unit quantization unit that summarizes the normalization information (IDSF)
- IDSF unit quantization unit that summarizes the normalization information
- the number M is set to 3
- the normalized information is grouped by three, and the average value is calculated as a representative value to obtain the shape of the normalized information.
- the description will be made assuming that the normalization information is encoded with 6 bits.
- Fig. 13A For example, suppose that the normalization information for each quantization unit (QU) is given as shown in Fig. 13A.
- the normalized information of the quantization unit numbers 0 to 2 is 54, 53, and 5, respectively.
- the representative value is 53, which is the average value.
- the approximate vector is a four-dimensional vector (53, 41, 41, 4).
- the error (distance) between this approximate vector and the quantized approximate vector (qs li ape) is calculated, and the quantized approximate vector of index 2 is calculated.
- the quantization accuracy information (IDSF) and the quantization outline vector (qshape) are as shown in Fig. 13B.
- a normalized information residual signal (rIDSF) is obtained. That is, a normalized information residual signal is obtained by subtracting the value of the quantized approximate vector from the normalized information.
- This normalized information residual signal is as shown in FIG. 13C.
- the number of bits is 33 bits. Since the index of the quantization outline vector shown in FIG. 9 is represented by 4 bits, the number of coding bits of the quantization accuracy information is 37 bits in total. In the case of non-compression, 72 bits are required, so that the method of the present embodiment enables 35-bit compression.
- sub-information such as quantization accuracy information and regular information can be efficiently compressed without losing information.
- the quantization accuracy information residual signal often does not fall within the range of 11 to +1, It can be assumed that encoding the quantization accuracy information as usual can reduce the number of bits.
- an encoding unit for encoding the sub-information by another encoding method is provided, and the amount of code by the encoding method of the present embodiment and the other encoding method It is realistic to compare the code amount by the expression in the comparison unit and select the coding method with a small code amount in the selection unit.
- the encoding device compares the main information encoding unit 50, the first sub information encoding unit 51, and the second sub information encoding unit 52 with each other.
- a comparison unit 53 as a means and a switch 54 as a selection means are provided.
- the main information encoding unit 5 0, band division unit 1 1 shown in FIG. 3, the normalization unit 1 2 to 1 2 4, quantization accuracy determining unit 1 3, quantizer 1 4 -1 4 and the multiplexer Equivalent to 17.
- the first sub-information encoding unit 51 encodes sub-information such as quantization accuracy information and normalization information by a method according to the present embodiment, that is, extracts and encodes an outline
- the encoding unit 52 encodes the sub information as usual.
- the comparing section 53 compares the code amount in the first sub-information encoding section 51 with the code amount in the second sub-information encoding section 52, and selects the switch with the smaller code amount. Control. As a result, the selected encoded sub-information is supplied to the main information encoding unit 50.
- FIG. 16 shows the configuration of decoding apparatus 30 according to the present embodiment.
- coded data is input to a demultiplexer 31 and decoded, and is separated into quantization coefficients, quantization accuracy information, and normalization information of the first to fourth coding units.
- Quantization coefficient of the first to fourth encoding units are supplied to signal component constituting part 3 4 i to 3 4 4 corresponding to each of the coding units.
- the quantization accuracy information and the normalization information are decoded by the quantization accuracy information decoding unit 32 and the normalization information decoding unit 33, respectively, the signal component configuration unit 3 corresponding to each coding unit is decoded. 4 i to 3 4 4 are supplied.
- the quantization coefficient of the first encoding unit is inversely quantized in a quantization step corresponding to the quantization accuracy information of the first encoding unit, whereby It is the normalized data of the coding unit of 1. Further, the signal component configuration unit 34 multiplies the data to be normalized of the first encoding unit by a value corresponding to the normalization information of the first encoding unit. The unit signal is decoded and output to band combining section 35.
- Similar processing is also the signal component constructing unit 3 4 2-3 4 4 is performed, thereby, the The signals of the second to fourth encoding units are decoded and output to band combining section 35.
- the band synthesizing unit 35 the signals of the first to fourth coding units are band-synthesized, whereby the original audio signal is restored.
- FIG. 17 shows a conceptual configuration of the quantization accuracy information decoding unit 32 described above.
- the residual signal decoding unit 40 decodes the input quantization accuracy information residual signal and supplies it to the synthesizing unit 42.
- the approximate decoding unit 41 decodes the approximate information of the quantization accuracy information based on the input index and supplies the decoded information to the synthesis unit 42.
- the synthesizing unit 42 synthesizes the outline information and the quantization accuracy information residual signal, and as quantization accuracy information, a signal component configuration unit 34 corresponding to each quantization unit shown in FIG. Supply i ⁇ 3444.
- the sub-information such as the quantization accuracy information and the normalization information is quantized in its outline, and the quantization error (residual signal) is variable-length coded. It is possible to reduce the number of bits used for encoding the sub information. Therefore, the reduced number of bits can be distributed to the encoding of main information such as an audio signal, and the quality of encoded sound can be improved.
- the representative value obtained for each unit quantization unit number is used as the outline information, but is not limited to this.
- LPC envelopes and LSP envelopes obtained from linear prediction coefficients or cepstrum envelopes obtained by converting the logarithm of the power spectrum to the time axis can be used as the outline information. The following is a brief explanation.
- the current value X (t) can be linearly predicted from past values by finding ⁇ (i) (1 ⁇ ⁇ ⁇ p) that minimizes the prediction error e (t). Can be. That is, assuming that a linear prediction value of X (t) is x '(t), x' (t) is represented by the following equation (2). Further, the prediction error e (t) at this time is expressed as in equation (3).
- This (i) is called a linear prediction coefficient (L P C).
- This L PC is obtained by first obtaining an autocorrelation function r ( ⁇ ) of X (t) and solving a simultaneous linear equation with respect to this r ( ⁇ ).
- the normalization coefficient is the maximum value of the absolute value of the spectrum in each quantization unit, this normalization coefficient or the square of the normalization coefficient is defined as the maximum value of the power spectrum value. Can be considered. Since the inverse Fourier transform value of the power spectrum is an autocorrelation function, the linear prediction coefficient can be obtained from the normalized coefficient.
- L S L line spectrum pair obtained from the linear prediction coefficient
- the cepstrum is obtained by taking the logarithmic value of the power spectrum and performing an inverse Fourier transform. Therefore, the cepstrum is obtained from the normalization coefficient by taking the normalization coefficient or the logarithmic value of the square of the normalization coefficient and performing inverse Fourier transform, and using the lower order, the normalization coefficient is obtained. Can be expressed in outline.
- an outline of the quantization accuracy information can be similarly expressed by LPC, LSP, and cepstrum.
- INDUSTRIAL APPLICABILITY According to the present invention as described above, with respect to sub-information such as quantization accuracy information and normalization information, an outline thereof is quantized, and a quantization error (residual signal) is variable-length.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02733479A EP1396841B1 (en) | 2001-06-15 | 2002-06-11 | Encoding apparatus and method, decoding apparatus and method, and program |
DE2002625276 DE60225276T2 (de) | 2001-06-15 | 2002-06-11 | Codierungsvorrichtung und -verfahren, decodierungsvorrichtung und -verfahren und programm |
US10/344,624 US7212973B2 (en) | 2001-06-15 | 2002-06-11 | Encoding method, encoding apparatus, decoding method, decoding apparatus and program |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001182383A JP4506039B2 (ja) | 2001-06-15 | 2001-06-15 | 符号化装置及び方法、復号装置及び方法、並びに符号化プログラム及び復号プログラム |
JP2001-182383 | 2001-06-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002103685A1 true WO2002103685A1 (fr) | 2002-12-27 |
Family
ID=19022495
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/005808 WO2002103685A1 (fr) | 2001-06-15 | 2002-06-11 | Appareil et procede de codage, appareil et procede de decodage et programme |
Country Status (5)
Country | Link |
---|---|
US (1) | US7212973B2 (ja) |
EP (1) | EP1396841B1 (ja) |
JP (1) | JP4506039B2 (ja) |
DE (1) | DE60225276T2 (ja) |
WO (1) | WO2002103685A1 (ja) |
Families Citing this family (46)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7240001B2 (en) | 2001-12-14 | 2007-07-03 | Microsoft Corporation | Quality improvement techniques in an audio encoder |
JP4296752B2 (ja) * | 2002-05-07 | 2009-07-15 | ソニー株式会社 | 符号化方法及び装置、復号方法及び装置、並びにプログラム |
DE10328777A1 (de) * | 2003-06-25 | 2005-01-27 | Coding Technologies Ab | Vorrichtung und Verfahren zum Codieren eines Audiosignals und Vorrichtung und Verfahren zum Decodieren eines codierten Audiosignals |
EP1678959A4 (en) * | 2003-10-13 | 2011-04-27 | Realnetworks Inc | APPARATUS AND METHOD FOR ENCODING COMPACT SIGNALS |
US7460990B2 (en) | 2004-01-23 | 2008-12-02 | Microsoft Corporation | Efficient coding of digital media spectral data using wide-sense perceptual similarity |
EP1578134A1 (en) | 2004-03-18 | 2005-09-21 | STMicroelectronics S.r.l. | Methods and systems for encoding/decoding signals, and computer program product therefor |
EP1578133B1 (en) * | 2004-03-18 | 2007-08-15 | STMicroelectronics S.r.l. | Methods and systems for encoding/decoding signals, and computer program product therefor |
JP4734859B2 (ja) * | 2004-06-28 | 2011-07-27 | ソニー株式会社 | 信号符号化装置及び方法、並びに信号復号装置及び方法 |
JP4609097B2 (ja) * | 2005-02-08 | 2011-01-12 | ソニー株式会社 | 音声符号化装置及び方法、並びに音声復号装置及び方法 |
US8249861B2 (en) * | 2005-04-20 | 2012-08-21 | Qnx Software Systems Limited | High frequency compression integration |
US8086451B2 (en) * | 2005-04-20 | 2011-12-27 | Qnx Software Systems Co. | System for improving speech intelligibility through high frequency compression |
US7813931B2 (en) * | 2005-04-20 | 2010-10-12 | QNX Software Systems, Co. | System for improving speech quality and intelligibility with bandwidth compression/expansion |
JP4635709B2 (ja) * | 2005-05-10 | 2011-02-23 | ソニー株式会社 | 音声符号化装置及び方法、並びに音声復号装置及び方法 |
US7562021B2 (en) | 2005-07-15 | 2009-07-14 | Microsoft Corporation | Modification of codewords in dictionary used for efficient coding of digital media spectral data |
US7630882B2 (en) | 2005-07-15 | 2009-12-08 | Microsoft Corporation | Frequency segmentation to obtain bands for efficient coding of digital media |
US7835904B2 (en) * | 2006-03-03 | 2010-11-16 | Microsoft Corp. | Perceptual, scalable audio compression |
US7461106B2 (en) * | 2006-09-12 | 2008-12-02 | Motorola, Inc. | Apparatus and method for low complexity combinatorial coding of signals |
KR101411900B1 (ko) * | 2007-05-08 | 2014-06-26 | 삼성전자주식회사 | 오디오 신호의 부호화 및 복호화 방법 및 장치 |
US7761290B2 (en) | 2007-06-15 | 2010-07-20 | Microsoft Corporation | Flexible frequency and time partitioning in perceptual transform coding of audio |
US8046214B2 (en) | 2007-06-22 | 2011-10-25 | Microsoft Corporation | Low complexity decoder for complex transform coding of multi-channel sound |
US7885819B2 (en) | 2007-06-29 | 2011-02-08 | Microsoft Corporation | Bitstream syntax for multi-process audio decoding |
US8576096B2 (en) * | 2007-10-11 | 2013-11-05 | Motorola Mobility Llc | Apparatus and method for low complexity combinatorial coding of signals |
US8209190B2 (en) * | 2007-10-25 | 2012-06-26 | Motorola Mobility, Inc. | Method and apparatus for generating an enhancement layer within an audio coding system |
US8249883B2 (en) | 2007-10-26 | 2012-08-21 | Microsoft Corporation | Channel extension coding for multi-channel source |
US20090234642A1 (en) * | 2008-03-13 | 2009-09-17 | Motorola, Inc. | Method and Apparatus for Low Complexity Combinatorial Coding of Signals |
US8639519B2 (en) * | 2008-04-09 | 2014-01-28 | Motorola Mobility Llc | Method and apparatus for selective signal coding based on core encoder performance |
KR101518532B1 (ko) | 2008-07-11 | 2015-05-07 | 프라운호퍼 게젤샤프트 쭈르 푀르데룽 데어 안겐반텐 포르슝 에. 베. | 오디오 인코더, 오디오 디코더, 오디오 신호, 오디오 스트림을 부호화 및 복호화하는 장치 및 컴퓨터 프로그램 |
US8175888B2 (en) * | 2008-12-29 | 2012-05-08 | Motorola Mobility, Inc. | Enhanced layered gain factor balancing within a multiple-channel audio coding system |
US8140342B2 (en) * | 2008-12-29 | 2012-03-20 | Motorola Mobility, Inc. | Selective scaling mask computation based on peak detection |
US8200496B2 (en) * | 2008-12-29 | 2012-06-12 | Motorola Mobility, Inc. | Audio signal decoder and method for producing a scaled reconstructed audio signal |
US8219408B2 (en) * | 2008-12-29 | 2012-07-10 | Motorola Mobility, Inc. | Audio signal decoder and method for producing a scaled reconstructed audio signal |
CN102449689B (zh) * | 2009-06-03 | 2014-08-06 | 日本电信电话株式会社 | 编码方法、编码装置、编码程序、以及它们的记录介质 |
JP5501014B2 (ja) * | 2010-02-05 | 2014-05-21 | キヤノン株式会社 | 情報処理装置、情報処理方法、プログラム及び記憶媒体 |
US8428936B2 (en) * | 2010-03-05 | 2013-04-23 | Motorola Mobility Llc | Decoder for audio signal including generic audio and speech frames |
US8423355B2 (en) * | 2010-03-05 | 2013-04-16 | Motorola Mobility Llc | Encoder for audio signal including generic audio and speech frames |
ES2619369T3 (es) * | 2010-03-09 | 2017-06-26 | Nippon Telegraph And Telephone Corporation | Método de codificación, método de descodificación, aparato, programa y soporte de registro |
JP5325340B2 (ja) * | 2010-07-05 | 2013-10-23 | 日本電信電話株式会社 | 符号化方法、復号方法、符号化装置、復号装置、プログラム、及び記録媒体 |
CN105225669B (zh) * | 2011-03-04 | 2018-12-21 | 瑞典爱立信有限公司 | 音频编码中的后量化增益校正 |
JP5648123B2 (ja) | 2011-04-20 | 2015-01-07 | パナソニック インテレクチュアル プロパティ コーポレーション オブアメリカPanasonic Intellectual Property Corporation of America | 音声音響符号化装置、音声音響復号装置、およびこれらの方法 |
JP6265414B2 (ja) * | 2011-06-28 | 2018-01-24 | 日本電気株式会社 | 映像符号化装置及び映像復号装置 |
BR112014001016A2 (pt) * | 2011-07-18 | 2017-02-21 | Thomson Licensing | método e dispositivo para codificar um vetor de orientação de um componente conectado, método e dispositivo de decodificação correspondente e meio de armazenagem que carrega tais dados codificados |
US9071825B2 (en) * | 2012-04-24 | 2015-06-30 | Tektronix, Inc. | Tiling or blockiness detection based on spectral power signature |
US9129600B2 (en) | 2012-09-26 | 2015-09-08 | Google Technology Holdings LLC | Method and apparatus for encoding an audio signal |
ES2753228T3 (es) | 2012-11-05 | 2020-04-07 | Panasonic Ip Corp America | Dispositivo de codificación de audio de voz, dispositivo de decodificación de audio de voz, procedimiento de codificación de audio de voz y procedimiento de decodificación de audio de voz |
EP2919232A1 (en) * | 2014-03-14 | 2015-09-16 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Encoder, decoder and method for encoding and decoding |
RU2712125C2 (ru) * | 2015-09-25 | 2020-01-24 | Фраунхофер-Гезелльшафт Цур Фердерунг Дер Ангевандтен Форшунг Е.Ф. | Кодер и способ кодирования аудиосигнала с уменьшенным фоновым шумом с использованием кодирования с линейным предсказанием |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0816195A (ja) * | 1994-06-30 | 1996-01-19 | Samsung Electron Co Ltd | ディジタルオーディオ符号化方法及び装置 |
JPH0918348A (ja) * | 1995-06-28 | 1997-01-17 | Graphics Commun Lab:Kk | 音響信号符号化装置及び音響信号復号装置 |
JPH0934493A (ja) * | 1995-07-20 | 1997-02-07 | Graphics Commun Lab:Kk | 音響信号符号化装置、音響信号復号装置および音響信号処理装置 |
JPH09214346A (ja) * | 1996-02-08 | 1997-08-15 | Matsushita Electric Ind Co Ltd | ロスレス符号装置とロスレス記録媒体とロスレス復号装置とロスレス符号復号装置 |
JPH09261066A (ja) * | 1996-03-27 | 1997-10-03 | Matsushita Electric Ind Co Ltd | ロスレス符号装置とロスレス記録媒体とロスレス復号装置とロスレス符号復号装置 |
JPH09261068A (ja) * | 1996-03-27 | 1997-10-03 | Toshiba Corp | データ圧縮/復号/伝送/受信/記録/再生の方法と装置 |
JPH11242499A (ja) * | 1997-08-29 | 1999-09-07 | Toshiba Corp | 音声符号化/復号化方法および音声信号の成分分離方法 |
JP2001092499A (ja) * | 1999-09-27 | 2001-04-06 | Sanyo Electric Co Ltd | オーディオ信号符号化装置およびオーディオ信号符号化方法 |
JP2002041097A (ja) * | 2000-06-02 | 2002-02-08 | Lucent Technol Inc | 符号化方法、復号化方法、符号化器、及び復号化器 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6333935A (ja) * | 1986-07-29 | 1988-02-13 | Sharp Corp | ゲイン/シエイプ・ベクトル量子化器 |
JPH0332228A (ja) * | 1989-06-29 | 1991-02-12 | Fujitsu Ltd | ゲイン―シェイプ・ベクトル量子化方式 |
US5497246A (en) * | 1993-07-15 | 1996-03-05 | Asahi Kogaku Kogyo Kabushiki Kaisha | Image signal processing device |
BE1007616A3 (nl) | 1993-10-11 | 1995-08-22 | Philips Electronics Nv | Transmissiesysteem met vereenvoudigde broncodering. |
JP3341474B2 (ja) * | 1994-07-28 | 2002-11-05 | ソニー株式会社 | 情報符号化方法及び復号化方法、情報符号化装置及び復号化装置、並びに情報記録媒体 |
GB9509831D0 (en) * | 1995-05-15 | 1995-07-05 | Gerzon Michael A | Lossless coding method for waveform data |
JP3191257B2 (ja) * | 1995-07-27 | 2001-07-23 | 日本ビクター株式会社 | 音響信号符号化方法、音響信号復号化方法、音響信号符号化装置、音響信号復号化装置 |
JP3283200B2 (ja) * | 1996-12-19 | 2002-05-20 | ケイディーディーアイ株式会社 | 符号化音声データの符号化レート変換方法および装置 |
US6285796B1 (en) * | 1997-11-03 | 2001-09-04 | Intel Corporation | Pseudo-fixed length image compression scheme |
JP3406275B2 (ja) * | 1999-05-21 | 2003-05-12 | 日本電信電話株式会社 | ディジタル信号符号化方法、ディジタル信号復号化方法、これらの装置及びその各プログラム記録媒体 |
JP2001094433A (ja) | 1999-09-17 | 2001-04-06 | Matsushita Electric Ind Co Ltd | サブバンド符号化・復号方法 |
-
2001
- 2001-06-15 JP JP2001182383A patent/JP4506039B2/ja not_active Expired - Lifetime
-
2002
- 2002-06-11 DE DE2002625276 patent/DE60225276T2/de not_active Expired - Lifetime
- 2002-06-11 WO PCT/JP2002/005808 patent/WO2002103685A1/ja active IP Right Grant
- 2002-06-11 EP EP02733479A patent/EP1396841B1/en not_active Expired - Fee Related
- 2002-06-11 US US10/344,624 patent/US7212973B2/en active Active
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0816195A (ja) * | 1994-06-30 | 1996-01-19 | Samsung Electron Co Ltd | ディジタルオーディオ符号化方法及び装置 |
JPH0918348A (ja) * | 1995-06-28 | 1997-01-17 | Graphics Commun Lab:Kk | 音響信号符号化装置及び音響信号復号装置 |
JPH0934493A (ja) * | 1995-07-20 | 1997-02-07 | Graphics Commun Lab:Kk | 音響信号符号化装置、音響信号復号装置および音響信号処理装置 |
JPH09214346A (ja) * | 1996-02-08 | 1997-08-15 | Matsushita Electric Ind Co Ltd | ロスレス符号装置とロスレス記録媒体とロスレス復号装置とロスレス符号復号装置 |
JPH09261066A (ja) * | 1996-03-27 | 1997-10-03 | Matsushita Electric Ind Co Ltd | ロスレス符号装置とロスレス記録媒体とロスレス復号装置とロスレス符号復号装置 |
JPH09261068A (ja) * | 1996-03-27 | 1997-10-03 | Toshiba Corp | データ圧縮/復号/伝送/受信/記録/再生の方法と装置 |
JPH11242499A (ja) * | 1997-08-29 | 1999-09-07 | Toshiba Corp | 音声符号化/復号化方法および音声信号の成分分離方法 |
JP2001092499A (ja) * | 1999-09-27 | 2001-04-06 | Sanyo Electric Co Ltd | オーディオ信号符号化装置およびオーディオ信号符号化方法 |
JP2002041097A (ja) * | 2000-06-02 | 2002-02-08 | Lucent Technol Inc | 符号化方法、復号化方法、符号化器、及び復号化器 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1396841A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1396841B1 (en) | 2008-02-27 |
JP2002372995A (ja) | 2002-12-26 |
EP1396841A4 (en) | 2006-10-11 |
DE60225276T2 (de) | 2009-03-19 |
US20050261893A1 (en) | 2005-11-24 |
JP4506039B2 (ja) | 2010-07-21 |
EP1396841A1 (en) | 2004-03-10 |
US7212973B2 (en) | 2007-05-01 |
DE60225276D1 (de) | 2008-04-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2002103685A1 (fr) | Appareil et procede de codage, appareil et procede de decodage et programme | |
US7620554B2 (en) | Multichannel audio extension | |
KR100818268B1 (ko) | 오디오 데이터 부호화 및 복호화 장치와 방법 | |
JP3336617B2 (ja) | 信号符号化又は復号化装置,及び信号符号化又は復号化方法,並びに記録媒体 | |
CN106941003B (zh) | 能量无损编码方法和设备以及能量无损解码方法和设备 | |
CN102656628B (zh) | 优化的低吞吐量参数编码/解码 | |
USRE46082E1 (en) | Method and apparatus for low bit rate encoding and decoding | |
WO1998000837A1 (fr) | Procedes de codage et de decodage de signaux audio, et codeur et decodeur de signaux audio | |
JP2005049889A (ja) | オーディオ信号コーディング中にノイズ置換を信号で知らせる方法 | |
JP2009515212A (ja) | オーディオ圧縮 | |
WO1995001680A1 (fr) | Dispositif de codage de signaux numeriques, son dispositif de decodage, et son support d'enregistrement | |
JP2009510514A (ja) | マルチチャネルオーディオ信号の符号化/復号化方法及び装置 | |
JPH07336232A (ja) | 情報符号化方法及び装置、情報復号化方法及び装置、並びに情報記録媒体 | |
EP1905034A1 (en) | Virtual source location information based channel level difference quantization and dequantization method | |
WO2003098602A1 (fr) | Procede et dispositif de codage de signaux acoustiques, procede et dispositif de decodage de signaux acoustiques, programme et dispositif d'affichage d'image de support d'enregistrement | |
KR100352351B1 (ko) | 정보부호화방법및장치와정보복호화방법및장치 | |
JP2022509440A (ja) | 空間オーディオパラメータの符号化及び対応する復号の決定 | |
KR100952065B1 (ko) | 부호화 방법 및 장치, 및 복호 방법 및 장치 | |
JP3475985B2 (ja) | 情報符号化装置および方法、情報復号化装置および方法 | |
US7181079B2 (en) | Time signal analysis and derivation of scale factors | |
JPH07183857A (ja) | 伝送システム | |
JPH09130260A (ja) | 音響信号の符号化装置及び復号化装置 | |
JP2004246038A (ja) | 音声楽音信号符号化方法、復号化方法、符号化装置、復号化装置、符号化プログラム、および復号化プログラム | |
JPH0990989A (ja) | 変換符号化方法および変換復号化方法 | |
JPH09135173A (ja) | 符号化装置および符号化方法、復号化装置および復号化方法、伝送装置および伝送方法、並びに記録媒体 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2002733479 Country of ref document: EP |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 10344624 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 2002733479 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 2002733479 Country of ref document: EP |