• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    MULTIMODAL AUDIO SIGNAL DECODER, MULTIMODAL AUDIO SIGNAL ENCODER, METHODS AND COMPUTER PROGRAM USING A NOISE CONFIGURATION BASED ON LINEAR FORECAST CODING.A multimodal audio signal decoder to provide a decoded representation of audio content based on a coded representation of audio content comprises a spectral value determiner configured to obtain sets of decoded spectral coefficients for a plurality of portions of the audio content . The audio signal decoder also comprises a spectrum processor configured to apply a spectral configuration to a set of spectral coefficients, or its preprocessed version, depending on a set of linear prediction domain parameters for a portion of the content encoded audio in a linear prediction mode, and apply a spectral configuration to a set of decoded spectral coefficients, or their preprocessed version, depending on a set of scale factor parameters for a portion of the audio content encoded in a frequency domain mode.
    公开号:BR112012007803A2
    申请号:R112012007803-8
    申请日:2010-10-06
    公开日:2020-08-11
    发明作者:Max Neuendorf；Guillaume Fuchs；Nikolaus Rettelbach；Tom BAECKSTROEM；Jérémie Lecomte；Jürgen Herre
    申请人:Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.；
    IPC主号:
    专利说明:

    [6] [6]); 10 * uses LPC only as a spectral envelope presentation for leveling the spectrum. It does not exploit the LPC or the quantization noise configuration or the ease of transitions when switching to another audio encoder.
    [2] [2] Generic Coding of Moving Pictures and Associated Audio: Advanced Audio Coding. International Standard 13818-7, ISO / IEC JTC1 / SC29 / WG11 Moving Pictures Expert Group, 1997
    [3] [3] “Extended Adaptive Multi-Rate - MWideband (AMR-WB +) codec”, 3GPP TS 26.290 V6.3.0, 2005-06, Technical Specification 10
    [4] [4] “Audio Encoder and Decoder for Encoding and Decoding Audio Samples”, FHOB80O703PUS, F49510, incorporated by reference,
    [5] [5] “Apparatus and Method for Encoding / Decoding an Audio Signal Using on the Aliasing Switch Scheme”, FHO8O715PUS, F49522, incorporated by reference
    [6] [6] “High-quality audio-coding at less than 64 kbits / s“ by using transform-domain weighted interleave vector and quantization (Twin VQ) ”, N. Iwakami and T. Moriya and S. Miki, IEEE ICASSP, 1995 L o
    权利要求:
    Claims (26)
    [1]
    Claims 7 1. An audio signal decoder: multimodal (1100; 1200) for providing a decoded representation (1112; 1212) of audio content based on an encoded representation (1110; 1208) of the audio content, the decoder of an audio signal characterized by comprising: a spectral value determiner (1130; 1230a, 1230c) configured to obtain the sets (1132; 1230d) of decoded spectral coefficients (1132; 1230d; r [i]) for a plurality of portions (1410, 1412, 1414, 1416) of the audio content; a spectrum processor (1230e; 1378) configured to apply a spectral configuration to a set (1132; 1230d; r [i]) of decoded spectral coefficients, or its pre-processed version (1132 '), depending on a set of linear prediction domain parameters for a portion of the audio content encoded in the linear prediction mode, and apply a spectral configuration to a set (1132; 1230d; r (i] l) of decoded spectral coefficients, or their pre- (1232 '), depending on a set of scale factor parameters (1152; 1260b) for a portion (1410; 1416) of the audio content encoded in the frequency domain mode, and a frequency domain converter for time domain (1160; 1230g) configured to obtain a time domain representation (1162; 1232; xi, n) of audio content based on a spectrally configured set (1158; 1230f) of the decoded spectral coefficients for a portion of content the audio encoded in the linear prediction mode,
    [2]
    and to obtain a time domain representation (1162; 1232) of the audio content based on a spectrally configured set of decoded spectral coefficients for a portion of the audio content encoded in the frequency domain mode. 2. The multimodal audio signal decoder according to claim 1, characterized in that the multimodal audio signal decoder further comprises an overlapper (1233) configured for overlapping and adding a time domain representation of a portion of the content. audio encoded in the e 10 linear prediction mode with a portion of the audio content encoded in the frequency domain mode.
    [3]
    3. The multimodal audio signal decoder | according to claim 2, characterized in that the | frequency domain to time domain (1160; 12309) is configured to obtain a time domain representation of the audio content for a portion (1412; 1414) of the audio content encoded in the linear prediction mode using a doubled transformation, and to get a domain representation o. of the audio content for a portion (1410; 1416) of the audio content encoded in the frequency domain mode using a doubled transformation, and the overlapper is configured for time domain representations of overlapping portions of the content of subsequent audio encoded in different modes.
    [4]
    4. The multimodal audio signal decoder according to claim 3, characterized in that the frequency domain to time domain converter (1160; 1230g) is configured to apply the doubled transformations of the same type: transformation to obtain representations time domain of audio content for portions of audio content encoded in different modes; and the overlapper is configured to overlap and add the time domain representations of subsequent portions of the audio content encoded in different modes so that a time domain aliasing caused by the doubled transformation is reduced or eliminated.
    [5]
    () 10 5. The multimodal audio signal decoder | according to claim 4, characterized by the fact that the overlapper is configured to overlay and add a time domain representation with window of a first portion (1414) of the encoded audio content in a first of the 15th modes as provided by an associated doubled transformation, or its version in scale of amplitude, but not spectral distorted, and a time domain representation with window of a second subsequent portion (1416) of the content of audio and coded in a second of the modes, as provided by an associated doubled transformation, or its scaled version of amplitude, but not spectral distorted.
    [6]
    The multimodal audio signal decoder according to one of claims 1 to 5, characterized in that the frequency domain to time domain converter (1160; 1230g) is configured to provide the portion time domain representations (1410 , 1412, 1414, 1416) of audio content encoded in different modes, so that the time domain representations provided are in the same domain so that they are linearly combinable without applying a "signal configuration filtering, except a window management transition operation, for one or both of the provided time domain representations.
    [7]
    The multimodal audio signal decoder according to one of claims 1 to 6, characterized in that the frequency domain to time domain converter (1160; 1230g) is configured to perform a reverse modified discrete cosine transformation to obtain as a result of the oe 10 reverse modified discrete cosine transformation, a time domain representation of the audio content in an audio signal domain for both a portion of the audio content encoded in linear prediction mode and a portion of the content encoded audio in frequency domain mode.,
    [8]
    8. The multimodal audio signal decoder | according to one of claims 1 to 7, comprising: a linear prediction encoding filter coefficient determiner configured to obtain the decoded linear prediction encoding filter coefficients (à à o based on a coded representation of the | linear prediction encoding filter for a portion of the audio content encoded in the linear prediction mode; a filter coefficient transformer (1260e) configured to transform the decoded Linear Prediction Encoding coefficients (1260d; oa; to O) in a spectral representation (1260f; Xo [k])), in order to obtain values of gains in linear forecast mode (g [k]) associated with the different frequencies; | ;
    a scale factor determiner (1260a) configured to obtain decoded scale factor values (1260f) based on an encoded representation (1254) of the scale factor values for a portion of the audio content encoded in a domain mode of frequency; characterized in that the spectrum processor (1150; 1230e) comprises a spectrum modifier configured to combine a set (1132; 1230d; r [i] l) of decoded spectral coefficients associated with a portion of the audio content encoded in the mode linear forecast, or its pre-processed version, with the values of gains in linear forecast mode (g [k])), in order to obtain a processed version of gain (1158; 1230f; rr [i]) of the coefficients decoded spectral spectra, in which the contributions of the decoded spectral coefficients (1130; 1230d; ri), or their pre-processed version, are weighted depending on the values of gains in linear forecast mode (glk)), and also configured to match a set (1132; 1230d; x ac invquant) of the decoded or spectral coefficients associated with a portion of the audio content encoded in the frequency domain mode, or its preprocessed version, with the scale factor values (1260b,) , with the fine the possibility of obtaining a processed version of the scale factor (x rescal) of the decoded spectral coefficients (x ac invquant) in which the contributions of the decoded spectral coefficients, or their pre-processed version, are weighted depending on the scale factor values .
    [9]
    The multimodal audio signal decoder according to claim 8, characterized in that the transformer the filter coefficient RR (1260e) is configured to transform the decoded coefficients of the linear prediction encoding filter (1260d), which represent a time domain impulse response (w [n]) from a linear prediction encoding filter, in a spectral representation (X) [k]) using a discrete Fourier transformation; and the filter coefficient transformer (1260e) is configured to derive the gain values from; linear forecast mode (g [k]) from the spectral representation | o 10 (Xo [k]) of the decoded coefficients of the linear prediction encoding filter (1260d; a, a a), so that the gain values are a function of the magnitude of the coefficients (Xo [k]) of the spectral representation (Xf [k]).
    [10]
    The multimodal audio signal decoder according to claim 8 or claim 9, characterized in that the filter coefficient transformer (1260e) and the combiner (1230e) are configured so that a contribution of a given decoded spectral coefficient (r ([i)), or from its pre-processed version, to a processed gain version (rr [i]) of a given spectral coefficient is determined by a magnitude of a linear prediction mode gain value (g [k ]) associated with a certain decoded spectral coefficient (r [i]).
    [11]
    The multimodal audio signal decoder according to one of claims 1 to 9, characterized in that the spectrum processor (1230e) is configured so that a weighted contribution of a given decoded spectral coefficient (r [i]), or from its pre-processed version, to a processed gain version (rr [i]) of a given spectral coefficient increases with the increasing magnitude of a linear forecast mode gain value (g [k])) associated with a given coefficient decoded spectral (r [i] l), or so that a weighting of a contribution from a given decoded spectral coefficient (r [i]), or its pre-processed version, to a processed gain version (rr [i] ) of a given spectral coefficient decreases with the increasing magnitude of an associated spectral coefficient (X, [k]) of a spectral representation of the decoded coefficients of the 10 linear prediction encoding filter.
    [12]
    The multimodal audio signal decoder according to one of claims 1 to 11, characterized in that the spectral value determiner (1130; 1230a, 1230c) is configured to apply an inverse quantization to the quantized spectral decoded coefficients 15, for the purpose to obtain the decoded and inversely quantized spectral coefficients (1132; 1230d); and since the spectrum processor (1230e) is configured to perform a quantization noise configuration by adjusting an effective quantization step for a given decoded spectral coefficient (r [i] l) depending on a magnitude of a gain value in a linear prediction mode (g [k]) associated with a certain decoded spectral coefficient (r [i] l).
    [13]
    13. The multimodal audio signal decoder according to one of claims 1 to 12, characterized in that the audio signal decoder is configured to use an intermediate frame of linear prediction mode start (1212) in order to carry out the transition from a frame of the mode
    | 8/16 | frequency domain (1410) to a combined mode mode frame | linear forecast / algebraic code excited linear forecast mode, the audio signal decoder is configured to obtain a set of decoded spectral coefficients for the linear forecast mode start frame, apply a spectral configuration to the set of spectral coefficients decoded to the start frame of linear forecast mode, or its preprocessed version, depending on a set of parameters of the linear forecast domain associated with it, to obtain a time domain representation of the start frame of linear forecast mode based on a spectral set of spectral coefficients | 15th decoded, and | apply a start window with a comparatively long left-hand transition slope and a comparatively short right-hand transition slope to the time domain representation of the linear forecast mode start frame.
    [14]
    14. The multimodal audio signal decoder: according to claim 13, characterized in that the audio signal decoder is configured for overlapping! of a right side portion of a time domain representation of a frequency domain mode frame (1410) preceding the linear forecast mode start frame (1412) with a left side portion of a time of the start frame of linear forecast mode, to obtain lp MD DN 9/16 | | a reduction or cancellation of a time domain aliasing.
    [15]
    15. The multimodal audio signal decoder | according to claim 13 or claim 14, | characterized in that the audio signal decoder is configured to use the linear forecast domain parameters associated with the linear forecast mode start frame (1412) with the | purpose of initializing an algebraic code excited linear prediction mode decoder to decode at least | a portion of the combined frame of linear forecast mode / | | o 10 excited linear prediction of algebraic code following the chart | start of linear forecast mode. |
    [16]
    16. A multimodal audio signal encoder | (100; 300; 900; 1000) to provide a coded representation | | (112; 312; 1012) of an audio content based on a | input representation (110; 310; 1010) of the audio content, the audio signal encoder comprising: | a time domain to domain converter |
    Í frequency (120; 330a, 350a; 1030a) configured to process the | o and input representation (110; 310; 1010) of the audio content, | to obtain a frequency domain representation (122; 330b; |: 1030b) of the audio content, characterized in that the frequency domain representation (122) comprises a sequence of sets of spectral coefficients; | a spectrum processor (130; 330e; 3500; | 1030e) configured to apply a spectral configuration to a | set of spectral coefficients, or their pre-processed version, | depending on a set of prediction domain parameters j linear (134; 340b) for a portion of the audio content to be already encoded in the linear prediction mode, to obtain a set
    Í spectral configuration (132) of spectral coefficients, and Í apply a spectral configuration to a set of spectral coefficients, or their pre-processed version, depending on a 'set of scale factor parameters (136) for a portion the audio content to be encoded in the frequency domain mode, to obtain a spectral set (132) of spectral coefficients; and a quantization encoder (140; 330g, 330i, the 10 350f, 350h; 1030g, 1030i) configured to provide a coded version (142; 322, 342; 1032) of a configured set of | spectral form (132; 350e; 1030f) of spectral coefficients for the portion of the audio content to be encoded in the linear prediction mode, and to provide a coded version (142; 322, 342; 1032) of a spectral configured set (132; 330f; 1030f) of spectral coefficients for the portion of the audio content to be encoded in the frequency domain mode.
    [17]
    The multimodal audio signal encoder o according to claim 16, characterized in that the | time domain to frequency domain (120; 330a, 350a; | 1030a) is configured to convert a time domain representation (110; 310; 1010) of an audio content into an audio signal domain into a representation of frequency domain (122; | 330b; 1030b) of the audio content for both a portion of the | audio content to be encoded in linear prediction mode | as for a portion of the audio content to be encoded in frequency domain mode.
    [18]
    18. The multimodal audio signal encoder | oo according to claim 16 or claim 17, characterized in that the time domain to frequency domain converter (120; 330a, 350a; 1030a) is configured to apply double transformations of the same type of transformation to obtain the domain representations of frequency for the portions of the audio content to be encoded in different modes.
    [19]
    19. The multimodal audio signal encoder according to one of claims 16 to 18, characterized in that the spectral processor (130; 330e, 350b; 1030e) is configured for | oe 10 selectively apply the spectral configuration to the set (122; | 330b; 1030b) of spectral coefficients, or its pre- | processed, depending on a set (134; 340b) of linear prediction domain parameters obtained using an analysis based on correlation of a portion of the audio content to be encoded in the linear prediction mode, or depending on a set ( 136; 330d; 1070b) of scale factor parameters obtained using a psychoacoustic model analysis (330c; 1070a) of a portion of the audio content to be encoded in the o and frequency domain mode.
    [20]
    20. The multimodal audio signal encoder according to claim 19, characterized in that the audio signal encoder comprises a mode selector configured to analyze the audio content in order to decide whether to encode a portion of the audio content in linear forecast mode or frequency domain mode.
    [21]
    21. The multimodal audio signal encoder according to one of claims 16 to 20, characterized in that the multichannel audio signal encoder is configured to encode an audio frame, which is between a frequency domain mode frame and a Combined encoding excitation linear prediction mode combined frame / algebraic code excited linear prediction mode as a start frame of S linear prediction mode, the multimodal audio signal encoder being configured to apply a start window with a comparatively long left-hand transition slope and a comparatively short right-hand transition slope to the time domain representation of the linear forecast mode start frame, to obtain a windowed time domain representation, obtain a frequency domain representation 155 of the time domain representation with linear forecast mode start frame window, obtain a set of linear forecast domain parameters for the linear or forecast mode start frame, apply a spectral configuration to the frequency domain representation of the time domain representation with linear forecast mode start frame window, or its pre-processed version, depending on the set of linear forecast domain parameters, and encode the set of linear forecast domain parameters and frequency domain representation spectrally configured from the time domain representation with frame window start of linear forecast mode.
    O
    [22]
    22. The multimodal audio signal encoder | according to claim 21, characterized in that the multimodal audio signal encoder is configured to use the linear prediction domain parameters associated with the linear prediction mode start frame for the purpose of initializing an excited linear prediction mode encoder of algebraic code for coding at least a portion of the combined frame of linear prediction mode of coded transformation excitation / linear prediction mode of algebraic code 10 following the start frame of linear prediction mode.
    [23]
    The multimodal audio signal encoder according to one of claims 16 to 22, the audio signal encoder comprising: a linear prediction encoding filter coefficient determiner (340a; 1070c) configured to analyze a portion of the content of audio to be encoded in a linear prediction mode, or its preprocessed version, to determine the prediction or linear encoding filter coefficients associated with the portion of the audio content to be encoded in the linear prediction mode; a filter coefficient transformer (350b; 1070d) configured to transform the linear prediction encoding filter coefficients into a spectral representation (Xolk]), in order to obtain the values of linear forecast mode gains (g [k ], 350c) associated with the different frequencies; a scale factor determiner (330c; 1070a) configured to analyze a portion of the audio content to be encoded in the frequency domain mode, or its pre-processed version, to determine the scale factors associated with the portion the audio content to be encoded in the frequency domain mode; a combiner arrangement (330e, 350d; 1030e) configured to combine a frequency domain representation of a portion of the audio content to be encoded in the | linear forecast mode, or its pre-processed version, with the values of gains of linear forecast mode (g [k])), to obtain the processed spectral components of gain, characterized by | oe 10 fact that the contributions of the spectral components of the representation of the frequency domain audio content are weighted in dependence on the values of gains of linear forecasting mode, and combine a frequency domain representation of a portion of the audio content to be encoded in the frequency domain mode, or its pre-processed version, with the scale factors, to obtain the processed spectral components of gain, characterized by the fact that the contributions and spectral components of the representation of the domain audio content of frequency are weighted in dependence of the scale factors, characterized by the processed spectral components of gain form the spectral configured sets of spectral coefficients.
    [24]
    24. A method for providing a decoded representation of audio content based on a coded representation of audio content, the method comprising: -. o obtain sets of decoded spectral coefficients for a plurality of portions of the audio content; apply a spectral configuration to a set of decoded spectral coefficients, or their preprocessed version, depending on a set of linear prediction domain parameters for a portion of the audio content encoded in a linear prediction mode, and apply a configuration spectral to a set of decoded spectral coefficients, the 10 or its pre-processed version, depending on a set of scale factor parameters for a portion of the audio content encoded in a frequency domain mode; and obtaining a time domain representation of the audio content based on a 15º spectral set of decoded spectral coefficients for a portion of the audio content encoded in linear prediction mode, and obtaining a time domain representation of the content based on a spectrally configured set of decoded spectral coefficients for a portion of the audio content encoded in frequency domain mode.
    [25]
    25. A method for providing an encoded representation of audio content based on an input representation of audio content, the method characterized by understanding: processing the input representation of audio content, to obtain a representation of audio content frequency domain, characterized by the fact that the frequency domain representation (122) comprises a sequence of sets of spectral coefficients; apply a spectral configuration to a set of spectral coefficients, or their pre-processed version, depending on a set of linear prediction domain parameters for a portion of the audio content to be encoded in the linear prediction mode, to obtain a set spectral configuration (132) of spectral coefficients; apply a spectral configuration to a set of spectral coefficients, or their preprocessed version, depending on a set of scale factor parameters for a portion of the audio content to be encoded in frequency domain mode, to obtain a spectrally configured set (132) of spectral coefficients; providing a coded representation of a spectral set of spectral coefficients for the portion of the audio content to be encoded in the linear prediction mode using a quantization encoding; and providing a coded version of a spectral set of spectral coefficients for the portion of the audio content to be encoded in frequency domain mode using a quantization encoding.
    [26]
    26. A computer program for carrying out the method according to claim 24 or 25, characterized in that the computer program operates on a computer.
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    法律状态:
    2020-08-18| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-12-22| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: G10L 19/02 , G10L 19/14 Ipc: G10L 19/022 (2013.01) |
    2020-12-22| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-01-19| B09Y| Publication of grant cancelled [chapter 9.1.2 patent gazette]|Free format text: ANULADA A PUBLICACAO CODIGO 9.1 NA RPI NO 2607 DE 22/12/2020 POR TER SIDO INDEVIDA. |
    2021-08-31| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2021-11-03| B350| Update of information on the portal [chapter 15.35 patent gazette]|
    2021-12-14| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    优先权:
    申请号 | 申请日 | 专利标题
    US24977409P| true| 2009-10-08|2009-10-08|
    US61/249,774|2009-10-08|
    PCT/EP2010/064917|WO2011042464A1|2009-10-08|2010-10-06|Multi-mode audio signal decoder, multi-mode audio signal encoder, methods and computer program using a linear-prediction-coding based noise shaping|
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