公开(公告)号：US11380340B2

公开(公告)日：2022-07-05

申请号：US15700059

申请日：2017-09-08

申请人： DTS, Inc.

发明人： Elias Nemer ,  Jacek Stachurski ,  Zoran Fejzo ,  Antonius Kalker

IPC分类号： G10L19/09 ,  G10L19/02 ,  G10L19/032 ,  G10L19/26 ,  G10L25/21

摘要： A frequency domain long-term prediction system and method for estimating and applying an optimum long term predictor. Embodiments of the system and method include determining parameters of a single-tap predictor using a frequency-domain analysis having an optimality criteria based on spectral flatness measure. Embodiments of the system and method also include determining parameters of the long-term predictor by accounting for the performance of the vector quantizer in quantizing the various subbands. In some embodiments other encoder metrics (such as signal tonality) are used as well. Other embodiments of the system and method include determining the optimal parameters of the long-term predictor by accounting for some of the decoder operation. Other embodiments of the system and method include extending a 1-tap predictor to a k-th order predictor by convolving the 1-tap predictor with a pre-set filter and selecting from a table of such pre-set filters based on a minimum energy criteria.

公开(公告)号：US10950251B2

公开(公告)日：2021-03-16

申请号：US16183189

申请日：2018-11-07

申请人： DTS, Inc.

发明人： Elias Nemer ,  Zoran Fejzo

IPC分类号： G10L19/038 ,  G10L19/02 ,  G10L19/005

摘要： Systems and methods include audio encoders having improved coding of harmonic signals. The audio encoders can be implemented as transform-based codecs with frequency coefficients quantized using spectral weights. The frequency coefficients can be quantized by use of the generated spectral weights applied to the frequency coefficients prior to the quantization or by use of the generated spectral weights in computation of error within a vector quantization that performs the quantization. Additional apparatus, systems, and methods are disclosed.

公开(公告)号：US10146500B2

公开(公告)日：2018-12-04

申请号：US15253646

申请日：2016-08-31

申请人： DTS, Inc.

发明人： Elias Nemer ,  Jeffrey K. Thompson ,  Antonius Kalker

IPC分类号： G06F17/00 ,  G06F3/16 ,  G10L19/032

摘要： A transform-based codec and method with energy smoothing for mitigating vector quantization errors (such as “birdies”) during the encoding process. Embodiments of the codec and method use an encoder to apply in combination an orthogonal transformation and a vector permutation to frequency transform coefficients. In some embodiments the transformation is performed first followed by the permutation and in other embodiments the order is reversed. The order used is reversed at the decoder. A smoothing parameter containing the level of energy smoothing to be applied is passed from the encoder to the decoder and used by both to compute a transform matrix and an inverse transform matrix. In some embodiments the transform matrix is a fraction Hadamard matrix that is invertible, energy preserving, controllable, and stable.

公开(公告)号：US20190272837A1

公开(公告)日：2019-09-05

申请号：US16183189

申请日：2018-11-07

申请人： DTS, Inc.

发明人： Elias Nemer ,  Zoran Fejzo

IPC分类号： G10L19/038 ,  G10L19/005 ,  G10L19/02

摘要： Systems and methods include audio encoders having improved coding of harmonic signals. The audio encoders can be implemented as transform-based codecs with frequency coefficients quantized using spectral weights. The frequency coefficients can be quantized by use of the generated spectral weights applied to the frequency coefficients prior to the quantization or by use of the generated spectral weights in computation of error within a vector quantization that performs the quantization. Additional apparatus, systems, and methods are disclosed.

公开(公告)号：US20180075855A1

公开(公告)日：2018-03-15

申请号：US15700059

申请日：2017-09-08

申请人： DTS, Inc.

发明人： Elias Nemer ,  Jacek Stachurski ,  Zoran Fejzo ,  Antonius Kalker

IPC分类号： G10L19/09 ,  G10L19/032 ,  G10L19/02 ,  G10L19/26 ,  G10L25/21

CPC分类号： G10L19/09 ,  G10L19/0212 ,  G10L19/032 ,  G10L19/26 ,  G10L25/21

摘要： A frequency domain long-term prediction system and method for estimating and applying an optimum long term predictor. Embodiments of the system and method include determining parameters of a single-tap predictor using a frequency-domain analysis having an optimality criteria based on spectral flatness measure. Embodiments of the system and method also include determining parameters of the long-term predictor by accounting for the performance of the vector quantizer in quantizing the various subbands. In some embodiments other encoder metrics (such as signal tonality) are used as well. Other embodiments of the system and method include determining the optimal parameters of the long-term predictor by accounting for some of the decoder operation. Other embodiments of the system and method include extending a 1-tap predictor to a k-th order predictor by convolving the 1-tap predictor with a pre-set filter and selecting from a table of such pre-set filters based on a minimum energy criteria.

公开(公告)号：US20180060023A1

公开(公告)日：2018-03-01

申请号：US15253646

申请日：2016-08-31

申请人： DTS, Inc.

发明人： Elias Nemer ,  Jeffrey K. Thompson ,  Antonius Kalker

IPC分类号： G06F3/16 ,  G10L19/032

CPC分类号： G06F3/165 ,  G10L19/0212 ,  G10L19/032

摘要： A transform-based codec and method with energy smoothing for mitigating vector quantization errors (such as “birdies”) during the encoding process. Embodiments of the codec and method use an encoder to apply in combination an orthogonal transformation and a vector permutation to frequency transform coefficients. In some embodiments the transformation is performed first followed by the permutation and in other embodiments the order is reversed. The order used is reversed at the decoder. A smoothing parameter containing the level of energy smoothing to be applied is passed from the encoder to the decoder and used by both to compute a transform matrix and an inverse transform matrix. In some embodiments the transform matrix is a fraction Hadamard matrix that is invertible, energy preserving, controllable, and stable.