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公开(公告)号：US09792923B2
公开(公告)日：2017-10-17
申请号：US15452936
申请日：2017-03-08
Applicant: Dolby International AB
Inventor： Kristofer Kjoerling , Per Ekstrand , Holger Hoerich
IPC: G10L19/00 , G10L19/093 , G10L19/07 , G10L19/26 , G10L19/02 , G10L19/028 , G10L19/16
CPC classification number: G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/028 , G10L19/06 , G10L19/07 , G10L19/093 , G10L19/167 , G10L19/24 , G10L19/26 , G10L19/265 , G10L21/038
Abstract: A method performed in an audio decoder for reconstructing an original audio signal having a lowband portion and a highband portion is disclosed. The method includes receiving an encoded audio signal and extracting reconstruction parameters from the encoded audio signal. The method further includes decoding the encoded audio signal with a core audio decoder to obtain a decoded lowband portion and regenerating the highband portion based at least in part on a cross over frequency and the decoded lowband portion to obtain a regenerated highband portion. The method also includes creating a synthetic sinusoid with a level based at least in part on a spectral envelope value for the particular subband and a noise floor value for the particular subband and adding the synthetic sinusoid to the regenerated highband portion in the particular frequency band specified by the location information. Finally, the method includes combining the lowband portion and the regenerated highband portion to obtain a full bandwidth audio signal.
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公开(公告)号：US09779746B2
公开(公告)日：2017-10-03
申请号：US15452918
申请日：2017-03-08
Applicant: Dolby International AB
Inventor： Kristofer Kjoerling , Per Ekstrand , Holger Hoerich
IPC: G10L19/00 , G10L19/093 , G10L19/07 , G10L19/26 , G10L19/02 , G10L19/16 , G10L19/028
CPC classification number: G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/028 , G10L19/06 , G10L19/07 , G10L19/093 , G10L19/167 , G10L19/24 , G10L19/26 , G10L19/265 , G10L21/038
Abstract: A method performed in an audio decoder for reconstructing an original audio signal having a lowband portion and a highband portion is disclosed. The method includes receiving an encoded audio signal and extracting reconstruction parameters from the encoded audio signal. The method further includes decoding the encoded audio signal with a core audio decoder to obtain a decoded lowband portion and regenerating the highband portion based at least in part on a cross over frequency and the decoded lowband portion to obtain a regenerated highband portion. The method also includes creating a synthetic sinusoid with a level based at least in part on a spectral envelope value for the particular subband and a noise floor value for the particular subband and adding the synthetic sinusoid to the regenerated highband portion in the particular frequency band specified by the location information. Finally, the method includes combining the lowband portion and the regenerated highband portion to obtain a full bandwidth audio signal.
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53.发明申请公开(公告)号：US20170264271A1
公开(公告)日：2017-09-14
申请号：US15608020
申请日：2017-05-30
Applicant: Dolby International AB
Inventor： Per Ekstrand
IPC: H03H17/02
CPC classification number: H04R3/04 , G06F17/10 , G06F17/11 , G10L19/008 , G10L19/0204 , G10L19/0208 , G10L19/26 , G10L19/265 , G10L21/00 , H03H17/0201 , H03H17/0248 , H03H17/0266 , H03H17/0275 , H03H17/0294 , H03H2017/0297 , H04S7/307
Abstract: An apparatus and method are disclosed for filtering an audio signal. The apparatus includes an analysis filter bank, a phase shifter, a high frequency reconstructor or parametric stereo processor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The phase shifter shifts a phase of the complex-valued subband samples by an amount. The high frequency reconstructor or parametric stereo processor modifies at least some of the complex valued subband samples. A phase shifter then unshifts a phase of the modified complex-valued subband samples by the amount. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples.
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54.发明授权公开(公告)号：US09743183B1
公开(公告)日：2017-08-22
申请号：US15586480
申请日：2017-05-04
Applicant: Dolby International AB
Inventor： Per Ekstrand
CPC classification number: H04R3/04 , G06F17/10 , G06F17/11 , G10L19/008 , G10L19/0204 , G10L19/0208 , G10L19/26 , G10L19/265 , G10L21/00 , H03H17/0201 , H03H17/0248 , H03H17/0266 , H03H17/0275 , H03H17/0294 , H03H2017/0297 , H04S7/307
Abstract: An apparatus and method are disclosed for filtering an audio signal are disclosed. The apparatus includes an analysis filter bank, a high frequency reconstructor or a parametric stereo processor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The high frequency reconstructor or parametric stereo processor modifies at least some of the complex valued subband samples. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters that are complex exponential modulated versions of a prototype filter.
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55.发明授权公开(公告)号：US09716486B1
公开(公告)日：2017-07-25
申请号：US15466266
申请日：2017-03-22
Applicant: Dolby International AB
Inventor： Per Ekstrand
CPC classification number: H04R3/04 , G06F17/10 , G06F17/11 , G10L19/008 , G10L19/0204 , G10L19/0208 , G10L19/26 , G10L19/265 , G10L21/00 , H03H17/0201 , H03H17/0248 , H03H17/0266 , H03H17/0275 , H03H17/0294 , H03H2017/0297 , H04S7/307
Abstract: An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a phase shifter, a high frequency reconstructor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The phase shifter shifts a phase of the complex-valued subband samples by an arbitrary amount. The high frequency reconstructor modifies at least some of the complex valued subband samples. A phase shifter unshifts a phase of the modified complex-valued subband samples by the arbitrary amount. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters that are complex exponential modulated versions of a prototype filter with an arbitrary phase shift.
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Patent Agency Ranking
公开(公告)号：US20170178658A1
公开(公告)日：2017-06-22
申请号：US15452954
申请日：2017-03-08
Applicant: Dolby International AB
Inventor： Kristofer Kjoerling , Per Ekstrand , Holger Hoerich
IPC: G10L19/093 , G10L19/26 , G10L19/07
CPC classification number: G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/028 , G10L19/06 , G10L19/07 , G10L19/093 , G10L19/167 , G10L19/24 , G10L19/26 , G10L19/265 , G10L21/038
Abstract: A method performed in an audio decoder for reconstructing an original audio signal having a lowband portion and a highband portion is disclosed. The method includes receiving an encoded audio signal and extracting reconstruction parameters from the encoded audio signal. The method further includes decoding the encoded audio signal with a core audio decoder to obtain a decoded lowband portion and regenerating the highband portion based at least in part on a cross over frequency and the decoded lowband portion to obtain a regenerated highband portion. The method also includes creating a synthetic sinusoid with a level based at least in part on a spectral envelope value for the particular subband and a noise floor value for the particular subband and adding the synthetic sinusoid to the regenerated highband portion in the particular frequency band specified by the location information. Finally, the method includes combining the lowband portion and the regenerated highband portion to obtain a full bandwidth audio signal.
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公开(公告)号：US20170178657A1
公开(公告)日：2017-06-22
申请号：US15452948
申请日：2017-03-08
Applicant: Dolby International AB
Inventor： Kristofer Kjoerling , Per Ekstrand , Holger Hoerich
IPC: G10L19/093 , G10L19/26 , G10L19/07
CPC classification number: G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/028 , G10L19/06 , G10L19/07 , G10L19/093 , G10L19/167 , G10L19/24 , G10L19/26 , G10L19/265 , G10L21/038
Abstract: A method performed in an audio decoder for reconstructing an original audio signal having a lowband portion and a highband portion is disclosed. The method includes receiving an encoded audio signal and extracting reconstruction parameters from the encoded audio signal. The method further includes decoding the encoded audio signal with a core audio decoder to obtain a decoded lowband portion and regenerating the highband portion based at least in part on a cross over frequency and the decoded lowband portion to obtain a regenerated highband portion. The method also includes creating a synthetic sinusoid with a level based at least in part on a spectral envelope value for the particular subband and a noise floor value for the particular subband and adding the synthetic sinusoid to the regenerated highband portion in the particular frequency band specified by the location information. Finally, the method includes combining the lowband portion and the regenerated highband portion to obtain a full bandwidth audio signal.
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公开(公告)号：US20170178646A1
公开(公告)日：2017-06-22
申请号：US15452890
申请日：2017-03-08
Applicant: Dolby International AB
Inventor： Kristofer Kjoerling , Per Ekstrand , Holger Hoerich
CPC classification number: G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/028 , G10L19/06 , G10L19/07 , G10L19/093 , G10L19/167 , G10L19/24 , G10L19/26 , G10L19/265 , G10L21/038
Abstract: A method performed in an audio decoder for reconstructing an original audio signal having a lowband portion and a highband portion is disclosed. The method includes receiving an encoded audio signal and extracting reconstruction parameters from the encoded audio signal. The method further includes decoding the encoded audio signal with a core audio decoder to obtain a decoded lowband portion and regenerating the highband portion based at least in part on a cross over frequency and the decoded lowband portion to obtain a regenerated highband portion. The method also includes creating a synthetic sinusoid with a level based at least in part on a spectral envelope value for the particular subband and a noise floor value for the particular subband and adding the synthetic sinusoid to the regenerated highband portion in the particular frequency band specified by the location information. Finally, the method includes combining the lowband portion and the regenerated highband portion to obtain a full bandwidth audio signal.
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公开(公告)号：US20170178645A1
公开(公告)日：2017-06-22
申请号：US15446562
申请日：2017-03-01
Applicant: Dolby International AB
Inventor： Lars G. Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
CPC classification number: G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/26 , G10L19/265 , G10L21/038
Abstract: The present invention relates to a new method and apparatus for improvement of High Frequency Reconstruction (HFR) techniques using frequency translation or folding or a combination thereof. The proposed invention is applicable to audio source coding systems, and offers significantly reduced computational complexity. This is accomplished by means of frequency translation or folding in the subband domain, preferably integrated with spectral envelope adjustment in the same domain. The concept of dissonance guard-band filtering is further presented. The proposed invention offers a low-complexity, intermediate quality HFR method useful in speech and natural audio coding applications.
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公开(公告)号：US20170178642A1
公开(公告)日：2017-06-22
申请号：US15446524
申请日：2017-03-01
Applicant: Dolby International AB
Inventor： Lars G. Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
CPC classification number: G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/26 , G10L19/265 , G10L21/038
Abstract: The present invention relates to a new method and apparatus for improvement of High Frequency Reconstruction (HFR) techniques using frequency translation or folding or a combination thereof. The proposed invention is applicable to audio source coding systems, and offers significantly reduced computational complexity. This is accomplished by means of frequency translation or folding in the subband domain, preferably integrated with spectral envelope adjustment in the same domain. The concept of dissonance guard-band filtering is further presented. The proposed invention offers a low-complexity, intermediate quality HFR method useful in speech and natural audio coding applications.
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