Low bit-rate audio signal coding and/or decoding method

low bit rate audoi signal decoding method

[0001] The application is a data of application is arranged on July 14, 2006 and pixel number of 200680025920.2, topics is in a method and apparatus for an and a wherein low bit rate audoi signal control audoi signal extracting important frequency spectrum device and/or decoded method and device of the division application claim patented.

technical field

[0002] The invention integral inventive concept referring to a audoi signal control and/or the decoding system, the specifcially said that referring to a extracting audoi signal method and apparatus for and a important frequency spectrum component wherein the method and device for low bit rate audoi signal coding and decoded.

background technology

[0003] A MPEG (of image expert set) and a is used in high high performance stereo sound encoding the standard IS0/IEC. The MPEG audio and moving video compression acts according to MPEG IS0/IEC SC29/WG11 one of the standardization. Is the MPEG audio, 32 frequency bands to the innertube (encodings frequency band decomposition encoding) and improved discrete cosine conversion (MDCT) is used for the inner, the specifcially, said of compressed by using mental electromotive execution high performance. With the traditional compression coding solution, the MPEG audio may be high sound.

[0004] For high performance according audoi signal, MPEG audio is a digital sensing a compression/to reduce the audoi signal the inner amount, wherein the body sensing encoding and a compression/, the humanity's sensitive feature of adopting using sensing signal audoi a connecting the subtraction detailed lower sensitive information.

[0005] A clock, the MPEG audio, silent side of listen to the limit and masker a minimum which is used for using sense of hearing mental the digital sensing. Silent side of listen to the limit minimum of the sense of hearing appreciable sound level minimum. A listen to the limit and a limiting the silent side of the sense of hearing appreciable noise minimum related. A hear limit the sound minimum the frequency. The frequencies, a hear with a listen to limit the sound minimum, and other frequencies, a separation to hear with a listen to limit the low sound minimum. A clock, a sensing of a specific sound a positioning according to with the sound and changing of the specific sound hears a. The is mounted in a masking for. Taxi masking effect's frequency width of sending the critical with. For head is sense of hearing mental a (e.g., critical with), decomposition the sound signal of the frequency spectrum device is very important. The invention, a frequency band of interconnected 32 innertubes, then executing innertube encoding. , Wherein the MPEG audio, a set aliasing noises for eliminating 32 innertubes.

invention content

[0006] Industrial problems

[0007] MPEG audio comprises a filter group and Bit assignment and quantization for mental lighting model. A best quantization Bit with the assignment coefficient of MDCT generation, and 2 is compressed by using psychology lighting model. For assigning the best Bits's mental lighting model 2 to position estimating the masking a based on FFT by using diffusion function. The invention, which are massive orders of complexity.

[0008] Usually, is low bit rate (32kbps or fewer) a pressing of audoi signal, the separable ration signal Bit number of the insufficient quantization audoi signal of frequency spectrum part and a lossless encodings. The invention, which the extracted sensing important frequency spectrum component (ISC) and quantizing and a lossless encoding.

[0009] technical solution

[0010] The invention integral inventive concept providing from audoi signal extracting important frequency spectrum device by the method and device for low bit rate according audoi signal.

[0011] The invention integral inventive concept is a providing is connected with the low bit rate audoi signal control method and device for method and device for audoi signal extracting important frequency spectrum device.

[0012] The invention integral inventive concept for providing a to a low bit rate audoi signal control method and device for coding the low Bit audoi signal decoding method and apparatus for low bit rate audoi signal decoding.

[0013] Arranged on the following rendering and elaborate of the invention other surface and any, part is a transparent is composed, or a undergo the capable of the present invention integral inventive concept to know.

[0014] A by providing a extracting audoi signal method for important frequency spectrum component (ISC) to position is the invention integral inventive concept is/or the aspects and advantages, wherein the method comprises: By using psychology lighting model comprises a variable frequency spectrum signal audoi signal masker with the sensing importance of (SMR), and using SMR of the frequency spectrum audoi signal masker threshold value frequency spectrum audoi signal to the selected masker threshold value less than the first; ISCA can the selected second ISC and first ISC frequency spectrum audoi signal extracting frequency spectrum peak according to the bottom of the factor. A obtained current signal frequency of the number frequency spectrum value obtaining the bottom times by using weighing factor.

[0015] The method further comprises obtain the frequency band (SNR signal noise ratio); A at the top end of with a SNR frequency band is greater than the first of the frequency spectrum device is selected to ISC image.

[0016] Is capable of providing a extracting audoi signal method for important frequency spectrum component (ISC) to position is the invention integral inventive concept is/or the aspects and advantages, wherein the method comprises: Is a lighting psychology model comprises a variable frequency spectrum audoi signal SMR (signal masker) of the sensing importance of value; The SMR the frequency spectrum audoi signal masker threshold value frequency spectrum audoi signal to the selected masker threshold value less than the first; ISCA obtaining is selected at the top end of with a SNR frequency band is greater than the preset value the frequency spectrum device frequency spectrum audoi signal is selected and first ISC frequency spectrum audoi signal SNR the frequency band and other ISC.

[0017] Also can be connected with the providing a low bit rate audoi signal control method to position is the invention integral inventive concept is/or the aspects and advantages, wherein the method comprises: Is a lighting psychology model comprises a frequency spectrum audoi signal SMR (signal masker) of the sensing importance of value; Using SMR of the frequency spectrum audoi signal masker threshold value frequency spectrum audoi signal is selected masker threshold value less than the first; ISCA according to a predetermined bottom of being composed and first ISC frequency spectrum audoi signal extracting frequency spectrum peak, and selecting with frequency spectrum of frequency meter frequency spectrum audoi signal and second; ISCAnd a lossless coding to the second with ISC frequency spectrum signal audoi performing quantification. Extracted frequency spectrum peak further comprises: Obtaining the frequency band (SNR signal noise ratio), and peak with a SNR frequency band is greater than the first of the frequency spectrum device is selected are symmetrically by using SNR third ISC. The low bit rate audoi signal coding method of a comprises: The improved discrete cosine conversion) and MDST (improved gas source converted to position) through a MDCT the time domain audoi signal conversion is a frequency spectrum audoi signal by the taxi frequency spectrum audoi signal. To ISC audoi signal performing quantization further comprises: Is composed of a audoi signal according to the use Bit rate and quantized the error with multiple groups minimum additional information; (Signal masker ratio) and multiple paths of dynamic ranges according to SMR the data transmitting ensurring quantization lengths of stride; With multiple groups of one or multiple the quantizers by using to the audoi signal quantification. Of is a group of horizontal standardization by using the value and quantization length of stride ensurring quantizer. The quantization can be Max-Lloyd quantification.

[0018] To quantization signal performing lossless encoding further comprises: Context operation control. Executing context operation control further comprises: For marking the ISC with frequency spectrum direction is set framing frequency spectrum component; A according to apparatus with the image and adjacent ISC of frame and distribution model probabilistic, a to audoi signal quantization value and a quantizer information, quantizing step packet and information and frequency spectrum index value additional information performing lossless encoding.

[0019] Also can be connected with the providing a low bit rate audoi signal control method to position is the invention integral inventive concept is/or the aspects and advantages, wherein the method comprises: Is a lighting psychology model comprises a frequency spectrum audoi signal SMR (signal masker) of the sensing importance of value; Using SMR of the frequency spectrum audoi signal masker threshold value frequency spectrum signal is selected masker threshold value less than the first; ISCFor selected and first ISC frequency spectrum audoi signal SNR the frequency band, and a SNR at the top end of with a SNR frequency band is greater than the first of the frequency spectrum device is selected and other; ISCWith is with other ISC frequency spectrum signal audoi performing quantizing and lossless encoding.

[0020] Is capable of providing a extracting audoi signal ISC (important frequency spectrum component) to position device for the invention integral inventive concept is/or the aspects and advantages, wherein the device comprises: Mental type unit, wherein a lighting psychology model comprises a variable frequency spectrum audoi signal SMR (signal masker) of the sensing importance of value; The first ISC selection unit, a SMR the frequency spectrum audoi signal masker threshold value frequency spectrum audoi signal to the selected masker threshold value less than the first; ISCAnd the second ISC selection unit, a can and second ISC and first ISC frequency spectrum audoi signal extracting frequency spectrum peak according to the bottom of the factor. A obtained current signal frequency of the number frequency spectrum value obtaining second ISC to the selected the bottom of being unit via using weighing factor. The device the comprises: The ISC selection unit, for frequency band (SNR signal noise ratio), and peak with a SNR frequency band is greater than the first of the frequency spectrum device is selected are symmetrically by using SNR third ISC.

[0021] Is capable of providing a extracting audoi signal ISC (important frequency spectrum component) to position device for the invention integral inventive concept is/or the aspects and advantages, wherein the device comprises: Mental type unit, wherein a lighting psychology model comprises a variable frequency spectrum audoi signal SMR (signal masker) of the sensing importance of value; The first ISC selection unit, a SMR the frequency spectrum audoi signal masker threshold value frequency spectrum audoi signal to the selected masker threshold value less than the first; ISCWith other ISC selection unit, for is selected and first ISC frequency spectrum audoi signal SNR the frequency band, and a SNR at the top end of with a SNR frequency band is greater than the first of the frequency spectrum device is selected and other ISC.

[0022] Also can be connected with the providing a low Bit audoi digital signal extracting device to position is the invention integral inventive concept is/or the aspects and advantages, wherein the device comprises: Mental type unit, wherein a lighting psychology model comprises a variable frequency spectrum audoi signal SMR (signal masker) of the sensing importance of value; First ISC (important frequency spectrum component) and unit, using SMR of the frequency spectrum audoi signal masker threshold value frequency spectrum audoi signal to the selected masker threshold value less than the first; ISCThe second ISC selection unit, according to the bottom of being composed and first ISC frequency spectrum audoi signal extracting frequency spectrum peak, and second; ISCQuantizer, the second with ISC frequency spectrum audoi signal, quantifyA lossless encoder, quantify signal performing lossless encoding.

[0023] The low bit rate audoi signal control device comprises a: The ISC selection unit, for frequency band (SNR signal noise ratio), and a SNR at the top end of with a SNR frequency band is greater than the first of the frequency spectrum device is selected to image and ISC.

[0024] The low bit rate audoi signal control device comprises a: The T/F converter unit; the improved discrete cosine conversion) and MDST (improved gas source converted to position) through a MDCT the time domain audoi signal conversion is a frequency spectrum audoi signal.

[0025] quantizer comprises: The two unit, according to a Bit rate and quantized error frequency spectrum signal audoi interconnected with multiple groups minimum additional information; The quantization length of stride measuring unit; the signal masker ratio) and data transmitting of multiple set according to SMR (dynamic range) determining quantization length of stride; With a group quantizer, the multiple paths of the quantizers by using to the frequency spectrum signal audoi quantification. The quantization of group quantizer can be Max-Lloyd quantization, a lossless encoder's lossless encoding or the context operation control.

[0026] Lossless coder comprises: A positioning device, wherein the ISC marking with frequency spectrum direction is set framing frequency spectrum component; Probabilistic model lossless, encoder according to apparatus with the image and adjacent ISC of frame and distribution model probabilistic, and frequency spectrum signal audoi quantization value and a quantizer information, quantify length of stride, packet information and frequency spectrum index value additional information performing lossless encoding.

[0027] Also can be connected with the providing a low Bit audoi signal control device to position is the invention integral inventive concept is/or the aspects and advantages, wherein the device comprises: Mental type unit, wherein a lighting psychology model comprises a variable frequency spectrum audoi signal SMR (signal masker) of the sensing importance of value; First ISC (important frequency spectrum component) and unit, a sensor is importance wherein the frequency spectrum audoi signal masker threshold value frequency spectrum audoi signal to the selected masker threshold value less than the first; ISCThe ISC selection unit, for is selected and first ISC frequency spectrum audoi signal SNR the frequency band, and peak with a SNR frequency band is greater than the first of the frequency spectrum device is selected by using SNR and other; ISCWith the quantizer; the other ISC frequency spectrum audoi quantization signal to the; aA lossless encoder, quantify signal performing lossless encoding.

[0028] Also can be connected with the providing a low Bit audoi signal decoding method to position is the invention integral inventive concept is/or the aspects and advantages, wherein the method comprises: Recovering ISC marking (important frequency spectrum component) with positioning information, quantizer information, quantify length of stride, ISC packet information and audoi signal quantization; andReference recovering quantizer information, quantify length of stride packet and information to audoi signal performing inverse; With the inverse value converting is a time domain signal.

[0029] Also can be connected with the providing a low Bit audoi signal decoder to position is the invention integral inventive concept is/or the aspects and advantages, wherein the device comprises: A lossless decoder; the extracting is used in probabilistic model information, and connected with probabilistic model retrieval information ISC marking (important frequency spectrum component) with positioning information, quantizer information, quantify length of stride, ISC packet information and audoi signal quantization; andThe counter quantizer, reference the recovering the quantizer information, quantify the length of stride packet and information performing inverse; With the F/T converter unit, the inverse value converting is a time domain signal.

[0030] Is of for be used in the executing method and computer program computer is connected with a fixed the medium to position is the invention integral inventive concept is/or the aspects and advantages by providing, wherein the method comprises: According to the mental lighting model comprises a variable frequency spectrum signal audoi signal masker with the sensing importance of (SMR), and sensor is importance the frequency spectrum audoi signal masker threshold value frequency spectrum audoi signal to the selected masker threshold value less than and one or multiple first important frequency spectrum component (ISC); A can the selected and one or multiple first ISC frequency spectrum audoi signal extracting frequency spectrum peak value according to the bottom of the factor and is used for frequency spectrum audoi signal control one or more second ISC.

[0031] Is of for be used in the executing method and computer program computer is connected with a fixed the medium to position is the invention integral inventive concept is/or the aspects and advantages by providing, wherein the method comprises: To audoi signal recovering important marking frequency spectrum component (ISC) with positioning information, quantizer information, quantify length of stride, ISC packet information and audoi signal quantization; andAccording to quantizer recovering information, quantify length of stride packet and information to audoi signal performing inverse; With the inverse signal transformation is a time domain signal.

[0032] Is capable of providing a audoi signal control and/or the decoding system to position is the invention integral inventive concept is/or the aspects and advantages, wherein the system comprises: , Encoder according to frequency band signal masker with the (SMR value), and a weighing factor and signal noise ratio (SNR) the frequency spectrum signal audoi the selection with one or more important frequency spectrum component (ISC), and according to a selection the information of ISC to frequency spectrum audoi control signal; With a decoder; according to the information to digital frequency spectrum audoi signal decoding.

[0033] Is capable of providing a audoi signal control and/or the decoding system to position is the invention integral inventive concept is/or the aspects and advantages, wherein the system comprises: , Encoder according to frequency band signal masker with the (SMR value), and a weighing factor and signal noise ratio (SNR) the frequency spectrum signal audoi the selection with one or more important frequency spectrum component (ISC), and according to a selection the information of ISC to frequency spectrum audoi signal control.

[0034] Is capable of providing a audoi signal control and/or the decoding system to position is the invention integral inventive concept is/or the aspects and advantages, wherein the system comprises: Decoder, according to ISC and information audoi signal decoding to encoding. A masker, and a weighing factor and a signal noise ratio (SNR) for comparing with the (SMR) and according to the frequency spectrum signal audoi frequency band signal) SC.

Brief composed fo the drawings

[0035] Through the combining figure's detailed rendering to the embodiment, perform the invention integral inventive concept's and other/aspects and advantages and multiple usage and is easier to understand:

[0036] Digital 1 is a meter to act according to the invention integral inventive concept the embodiment from the input audoi signal extracting important frequency spectrum device of pressing the low bit rate according audoi signal device, image

[0037] Digital 2 is a meter to act according to the invention integral inventive concept the embodiment from the input audoi signal extracting important frequency spectrum device of pressing the low bit rate according audoi signal method for flow chart;

[0038] Digital 3 is a meter to act according to the invention integral inventive concept the embodiment from the input audoi signal extracting important frequency spectrum device of pressing the low bit rate according audoi signal leds method, drawing

[0039] Digital 4 is a meter to act according to the invention integral inventive concept the embodiment using to reduce the audoi signal according to the low bit rate of the input audoi signal extracting important frequency spectrum device and low bit rate audoi signal control apparatus and diagram of structure;

[0040] Digital is 5 to the digital 4 device quantizers, diagram

[0041] Digital is 6 to the digital 4 a lossless control device, image

[0042] Digital 7 is a meter to act according to the invention integral inventive concept the embodiment is a audoi signal extracting important frequency spectrum device and method for flow chart with low bit rate audoi signal control method,

[0043] Digital is 8 to the digital 7 method ISC quantization detail; flowchart

[0044] Digital 9 is a meter to act according to the invention integral inventive concept the embodiment to by using of the low bit rate audoi signal decoding device diagram of the audoi signal extracting important frequency spectrum device device encoding's low bit rate audoi signal perform; aA

[0045] Digital 10 is a meter to act according to the invention integral inventive concept the embodiment connected to the low bit rate audoi signal decoding method for flow chart using extracting audoi signal important frequency spectrum device device encoding's low bit rate audoi signal perform a.

Specifcially a groove

[0046] Now the finger to the invention integral inventive concept's embodiment perform the detail, wherein a comprises a spring, a full digital, the mark is throughout part the. The following to explain the invention integral inventive concept reference is composed of embodiment.

[0047] Digital 1 is a meter to act according to the invention integral inventive concept the embodiment from input audoi signal extracting important frequency spectrum component (ISC) is pressing the low bit rate according audoi signal diagram device. Audoi signal ISC extracting device comprises mental type unit (100 ISC selection unit 150.

[0048] The mental type unit 100 and positioning according to the mental a conversion the frequency spectrum signal audoi a signal masker to compare of the SMR) and. Of spaced sine conversion (MDST by using improved discrete cosine conversion (MDCT) and improved), and are discrete Fourier transform (DFT)) for generating input to the mental type unit 100 frequency spectrum audoi sensor. And a result of MDCT and MDST arranged on behalf of audoi signal and a baseboard and device, therefore the is audoi signal and position information. The invention, further solve and DFT and MDCT are matched problems. The has undergone the DFT time domain audoi signal quantization MDCT coefficient by using generating a matching problems.

[0049] The ISC selection unit 150 ISC selected from the audoi signal by using SMR value. The ISC selection unit 150 comprises a first ISC line 152, ISC second selectors 154) and third ISC line 156 to the selected one or more ISC first, second ISC and third ISC are. One or more ISC first, second ISC and/or third ISC) is mounted ISC.

[0050] The first ISC line is 152 chosen the masker threshold value less than frequency spectrum audoi signal by the mental type unit 100 computations' SMR value by using the masker threshold value one or more frequency spectrum signal and one or multiple first important frequency spectrum component (ISC).

[0051] The second ISC 154 line of the bottom factor is a selected 152 to the selected one or more second ISC and one or multiple first ISC audoi signal extracting frequency spectrum peak value of the first ISC line.

[0052] Under the frequency spectrum peak of the one or a first ISC. Signal of strength based ensurring frequency spectrum peak. Is added on the baseboard and root to synchronize the defining signal of MDCT and MDST conversion's signal and a square the intensity. Obtaining the signal through a signal of frequency spectrum and bottom factor. The frequency of the number frequency spectrum value obtaining second ISC line 154 is a current signal (current signal when bottom board is obtained) and bottom factor. A) obtaining the bottom times by using law.

[0053]1)

<img id="idf0001" file="CN103106902AD00091.tif" img-content="drawing" img-format="tif" />

[0055] Matter, IsckI is weighing factor obtained current signal, intensity|sci | of|scj | is current signal of intensity signal. A clock, Ien is current signal of the signal.

[0056] The signal to the peak and bottom factor selected second ISC. For example, a peak and weighing factor's product and first) perform comparison to of selected is greater than the threshold value the value and second ISC.

[0057] The ISC line 156 pairs of audoi signal performing signal noise ratio of (SNR) balance. Further, the audoi signal frequency spectrum device of interconnected frequency band, and obtaining the frequency bands SNR, wherein with a SNR frequency band, the peak value is greater than the first of the frequency spectrum device is elected and one or multiple third ISC. Executing an operation of preventing ISC concentration of the specific frequency band. The other phone, and main peak of with a SNR frequency band, so the SNR or of the frequency bands in full frequency band. The result, a low SNR frequency band SNR and used, so the SNR value or of each frequency band.

[0058] Is the ISC selection unit 150 first ISC line 152, ISC second selectors 154) and third ISC line selectively 156 important frequency spectrum component (ISC) is audoi signal is extracted with sensor. For example, and first ISC line 152) and second ISC line 154 capable of using. However, and first ISC line 152) and third ISC line 156 capable of using. Otherwise, the first of ISC line 152, ISC second selectors 154) and third ISC line 156 capable of using. The invention, which is service and ISC of audoi signal extracting ISC first, second ISC and/or third ISC released, wherein a lossless encoding use of extract's ISC the audoi signal of frequency spectrum for quantizing the reducing the audoi signal.

[0059] Digital 2 is a meter to act according to the invention integral inventive concept the embodiment extracted audoi signal important frequency spectrum device of pressing the low bit rate according audoi signal method for flow chart. Reference chart 1 and digital 2, which is a lighting psychology model a conversion to the frequency domain audoi signal SMR and operation (200). , And by using SMR value, wherein the masker threshold value is lower than the area audoi signal frequency spectrum signal in masker threshold value is elected and first ISC operation (220).

[0060] A can and first ISC audoi signal extracting frequency spectrum peak and frequency spectrum peak according to the bottom of the factor and second ISC operation (240). The frequency of preset frequency spectrum value obtaining the bottom times by using current signal (current signal when bottom board is obtained). Operation 240 a second ISC line 154 operations of in the upper chart the 1. The invention, wherein the wherein rendering.

[0061] Is executing SNR balance and frequency (or frequency band) and ISC operation (260). Further, the audoi signal frequency spectrum device of the blocking frequency band; a obtained the frequency band SNR, and with a SNR frequency band, the peak value is greater than the first of the frequency spectrum device is elected to image and ISC. ISC first, second ISC and third ISC) is mounted is ISC. And formed on the executing, an operation of preventing ISC concentration of the specific frequency band. The other phone, and main peak of with a SNR frequency band, so the whole frequency band, a low SNR the SNR or of the frequency band. The result, a low SNR frequency band SNR and used, so the SNR value or of each frequency band.

[0062] On the handle, which is selected operation 220 to 260 ISC for extracting. For example, and operation 200 and 200) is used for extracted ISC. However, and operation 200 and 260) is used for extracted ISC. Otherwise, each operations 200, 240 and 260) is used for extracted ISC.

[0063] Digital 3 is a meter to act according to the invention integral inventive concept the embodiment from the input audoi signal extracting important frequency spectrum device of pressing the low bit rate according audoi signal method for drawing leds. Reference chart 2 and digital 3, for example by MDCT and MDST the input audoi signal conversion of the frequency spectrum audoi signal, and according to with a hear the signal and un-re-changeable hear the mental a computer and device for signal corresponding psychology lighting model frequency spectrum audoi signal corresponding signal masker comparing the (SMR) and. A (weight or horizontal) and/or SNR for with ISC first, second ISC and/or the third ISC frequency spectrum audoi signal according to the SNR value and weighing factor balance.

[0064] Digital 4 is a meter to act according to the invention integral inventive concept embodiment for extracting audoi signal important frequency spectrum device for low bit rate audoi signal control apparatus and diagram of structure. Low bit rate audoi signal control device comprises ISC extractor 420, 440 quantizers and lossless 460 encoder. Low bit rate audoi signal control device further comprises T/F converter 400 unit.

[0065] Reference chart 1 and a graph 4, T/F converter unit 400 of spaced sine conversion (MDST) is an improved discrete cosine conversion (MDCT) and improved the time domain audoi signal conversion is a frequency spectrum power (frequency spectrum signal audoi). By using MDCT and MDST (, and are discrete Fourier transform (DFT)) for generating input module connected with the ISC extractor 420 psychology lighting models' frequency spectrum audoi sensor. By and MDCT, and MDST represent the real part and baseboard device, so the other is audoi signal phase-component. The invention, further solve DFT and MDST are matched problems. Is a use of the DFT time domain audoi signal quantization MDCT coefficient generating a matching problems.

[0066] ISC extractor 420 of the frequency spectrum audoi signal extracting with ISC audoi signal. The ISC extractor 420 or audoi signal ISC extracting device is in digital 1, wherein the invention to wherein rendering. Further, the ISC extractor 420 comprises a mental type unit (100 ISC the selection unit 150 and with ISC audoi signal.

[0067] Quantizer 440 ISC quantization audoi sensor. Shown as a digital 5, 440 quantizer comprises a group unit 442, quantify length of stride determining units 444) and quantizer 446.

[0068] The two unit comprises 442 paths minimum additional information according to the use Bit rate and quantized the error performing. The execution's ISC quantization to selection. First, distorts according to the ratio to the ISC performing for selection two minimum additional information. The groove is a Bit rate and relationship between quantized errors. A Bit rate and quantized error of the internet change of. Further, comprising a Bit rate used, and quantized the error energy.

[0069] On the based upon, comprising a Bit rate fan, and quantized error increasing. And ISC is grouped, and costs of grouping of computer. The performing groups, so reducing costs.

[0070] The 64-path the formed with the, and a melting, so reducing frequency band costs. Comprising a clock, 2) are, for Bit number and a Bit of additional information adding of each group of the flexible the costs.

[0071]2)

[0072] Costs =qbit+ additional information (Bits of)

[0073] Bit output matter, qbit of each set of electric, additional information a zooming factor, quantify information.

[0074] In grouping, quantify the length of stride measuring unit 444 positioning according to the data of multiple the SMR and group (dynamic range) determining quantization length of stride. A clock, and commonly forming the ISC component horizontal the ISC standardization.

[0075] The audoi signal of quantizer 446 groups quantification. A group of ISC the value and quantization length of stride of horizontal standardization by using to position and fetching 446 quantizer.

[0076] The quantization can be Max-Lloyd quantification.

[0077] Lossless encoder 460 pairs of quantifications signal performing lossless encodings. Shown as a digital 6, a lossless encoder 460 comprises a unit (462) and probabilistic model lossless 464 encoder. A lossless encoding can be context operation control.

[0078] Positioning device 462 generation one or more frequency spectrum indexes to represent composed of each frequency spectrum device. Frequency spectrum direction ISC marking with. By using context operation encoding's frequency spectrum information encoding to ISC. The specifcially said that a representing ISC frequency spectrum of the consists of each frequency spectrum device for selection. The frequency spectrum index can be representative ISC with or not with O or a signal).

[0079] Probabilistic model lossless encoder 464) are provided with apparatus with the image and adjacent ISC of frame and distribution model probabilistic, and additional information to audoi signal quantizing and (a quantizer information, quantify length of stride, packet information and frequency spectrum positioning information) executing lossless encoding.

[0080] Digital 7 is a meter to act according to the invention integral inventive concept the embodiment is audoi signal ISC extracting method for low bit rate audoi signal control method for flow chart. (0081) And chart 4 and digital 7, to position by using improved discrete cosine conversion (MDCT) and improved gas source conversion (MDST) is time domain audoi signal conversion is a frequency spectrum signal operation (700). Variable frequency spectrum audoi signal by input to mental lighting model. The mental lighting model, the computing signal masker comparing (SMR) is importance of prediction frequency spectrum signal audoi operation (720). By using SMR and extract ISC operation (740). The ISC extracting of ISC extracting method of in digital 2, wherein the invention to wherein rendering.

[0082] Is extracted ISC, executing ISC quantization operation (760). Surface of the ISC quantify the digital 8 detailed the operation. Reference chart 8, and relational performing and quantized errors according to the use Bit rate two minimum additional information operation (762). The grouping of grouping unit 442 grouping is in digital 5, wherein the invention to wherein rendering.

[0083] The grouping, a data of multiple the SMR and group (dynamic range) determining quantization length of stride operation (764). A clock, and ISC horizontal commonly forming the ISC standardization of group.

[0084] , Which is a group of horizontal standardization by using the value and quantization length of stride ensurring quantizer.

[0085] The quantization can be Max-Lloyd quantification.

[0086] Reference digital 7; and quantization, executing lossless encoding operation (780). By context operation encoding's quantization value and frequency spectrum information encoding to ISC. A clock, a controls each frequency spectrum device is behalf of the ISC choice's frequency spectrum the index. The frequency spectrum direction is an O respectively and) is behalf of the ISC with and the with. Then, a frequency spectrum index value control. According to apparatus with the image and adjacent ISC of frame and distribution model probabilistic, and executing lossless encoding. Then, an encoding and performing Bit pack.

[0087] Digital is 9 to the use of extraction audoi signal important frequency spectrum device device encoding's the low bit rate audoi signal to perform the low bit rate audoi signal decoding device diagram of a. Low bit rate audoi signal decoding device comprises a lossless 900, counter quantizers 920 and F/T converter 940 unit.

[0088] The probabilistic model information of the lossless decoding extracting 900 paths, and connected with the probabilistic model retrieval information and ISC marking the positioning information, quantizer information, quantify length of stride, ISC packet information and audoi signal quantizing and a.

[0089] Counter quantizer 920 reference recovering quantizer information, quantify length of stride packet and information performing inverse.

[0090] The F/T converter 940 unit the inverse value converting is a time domain signal.

[0091] Digital is 10 to the contacting according to the invention integral inventive concept the embodiment is with extracting ISC audoi signal device encoding's the low bit rate audoi signal to perform the low bit rate audoi signal decoding method for flow chart according a. The finger to digital 9 and 10 of the operation for describing low bit rate audoi signal decoding method and device.

[0092] First; the lossless decoding 900 extracting frame the probabilistic model information operation (1000). Then, wherein the probabilistic model retrieval information ISC marking with positioning information, quantizer information, quantify length of stride, ISC packet information and audoi signal quantizing and operation (1020). Then, 920 acts according to the recovering of the counter quantizer the quantizer information, quantify the length of stride and packet information to quantizing and inverse operation (1040). The inverse; the F/T converter 940 unit the inverse value converting is a time domain signal operation (1060).

[0093] According to extracted with ISC method and apparatus for an and using method and device audoi signal low bit rate audoi signal encoding/decoding method and device, and head to obtain the low bit rate to the sensing important frequency spectrum device for coding the sound mass. A clock, and by using psychology lighting model extracting sensing important impact, without and position information encoding performing, and head represents the low bit rate frequency spectrum signal. A clock, which is needed to the lower bit rate audio encoding/at least application the neutral generation audio solutions to apply the invention.

[0094] The invention integral inventive concept is for capable of reading computer is a recording medium to be reading code of the computer. The computer - readable recording medium is a storage and is made by computer system for reading the data storage device for data. The computer - readable recording medium comprising a read-only memory (ROM) and random access memory, (RAM) CD-ROM, magnetic tape, disk and Guanzhong and data storage device and a support (e.g., wherein the data transmission of Internet). The computer - readable recording medium further provided with arranged on the network connecting computer system, so - readable code of the distributed storage groove and target computer. A clock, the programmers on the invention of field is easy to explain is a functionality, program of code and code connecting the invention.

[0095] Scheduled although display and rendering some embodiments of the present invention integral inventive concept, the technical person of the field the understand, and are separated from the invention integral inventive concept the processor and mental condition, a to the embodiment perform the; the claim equates and object to define the invention integral inventive concept the range.