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Patent Agency Ranking
公开(公告)号：US20160329062A1
公开(公告)日：2016-11-10
申请号：US15214694
申请日：2016-07-20
Applicant: Dolby International AB
Inventor： Per Ekstrand , Nicholas Luke Appleton
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: The document relates to modulated digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the document discloses a method comprising accessing a time-domain audio signal and applying a first filter bank to the time-domain audio signal, thereby producing a first plurality of subbands of frequency-domain audio data representative of at least a part of the audio signal. The filter bank comprises an decimated modulated filter bank obtained from an asymmetric prototype filter. The method further comprises applying a second filter bank to at least a first subband of the first plurality of subbands of frequency-domain audio data, thereby producing a second plurality of subbands of frequency-domain audio data representative of at least a part of the audio signal. The second modulated filter bank comprises an asymmetric modulated filter bank which includes no decimation. The method further comprises outputting at least the second plurality of subbands of frequency domain audio data.
Abstract translation: 该文件涉及调制数字滤波器组，以及用于设计这种滤波器组的方法和系统。 特别地，本文件公开了一种方法，包括访问时域音频信号并将第一滤波器组应用于时域音频信号，从而产生频域音频数据的第一多个子带，其代表至少部分 音频信号。 滤波器组包括从不对称原型滤波器获得的抽取调制滤波器组。 该方法还包括将第二滤波器组应用于频域音频数据的第一多个子带中的至少第一子带，从而产生表示音频的至少一部分的频域音频数据的第二多个子带 信号。 第二调制滤波器组包括不包括抽取的不对称调制滤波器组。 该方法还包括至少输出频域音频数据的第二多个子带。
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公开(公告)号：US20180115292A1
公开(公告)日：2018-04-26
申请号：US15788443
申请日：2017-10-19
Applicant: DOLBY INTERNATIONAL AB
Inventor： Nicholas Luke Appleton , Christopher Mark Tubb , William Thomas Rowley , Imankalyan Mukherjee
CPC classification number: H03G11/04 , H03G3/20 , H03G7/002 , H03G7/007 , H03G11/008
Abstract: An audio peak limiter apparatus which calculates a smoothed sequence of gains for application to a sequence of blocks of samples of an audio signal. The apparatus sometimes calculates a candidate gain, to replace a too-large smoothed gain, such that applying the candidate gain would produce no scaled sample whose magnitude exceeds a predetermined limit. The apparatus sometimes calculates and stores a final gain to replace the too-large smoothed gain (where the final gain can be obtained e.g. by dividing the to-be-replaced smoothed gain by a prior smoothed gain and multiplying the result by the corresponding prior final gain), if it is determined that the candidate gain is not less than the immediately previous final gain.
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公开(公告)号：US09865275B2
公开(公告)日：2018-01-09
申请号：US15214694
申请日：2016-07-20
Applicant: Dolby International AB
Inventor： Per Ekstrand , Nicholas Luke Appleton
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: The document relates to modulated digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the document discloses a method comprising accessing a time-domain audio signal and applying a first filter bank to the time-domain audio signal, thereby producing a first plurality of subbands of frequency-domain audio data representative of at least a part of the audio signal. The filter bank comprises an decimated modulated filter bank obtained from an asymmetric prototype filter. The method further comprises applying a second filter bank to at least a first subband of the first plurality of subbands of frequency-domain audio data, thereby producing a second plurality of subbands of frequency-domain audio data representative of at least a part of the audio signal. The second modulated filter bank comprises an asymmetric modulated filter bank which includes no decimation. The method further comprises outputting at least the second plurality of subbands of frequency domain audio data.
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公开(公告)号：US10659880B2
公开(公告)日：2020-05-19
申请号：US16191123
申请日：2018-11-14
Inventor： Dirk Jeroen Breebaart , Mark David de Burgh , Nicholas Luke Appleton , Heiko Purnhagen , Mark William Gerrard , David Matthew Cooper
IPC: H04R5/02 , H04R3/14 , H04R5/04 , H04S1/00 , H04M1/03 , H04M1/60 , H04R3/04 , H04S3/00 , H04S7/00
Abstract: A method of processing audio data for replay on a mobile device with a first speaker and a second speaker, wherein the audio data comprises a respective audio signal for each of the first and second speakers, includes: determining a device orientation of the mobile device; if the determined device orientation is vertical orientation, applying a first processing mode to the audio signals for the first and second speakers; and if the determined device orientation is horizontal orientation, applying a second processing mode to the audio signals for the first and second speakers. Applying the first processing mode involves: determining respective mono audio signals in at least two frequency bands based on the audio signals for the first and second speakers; in a first one of the at least two frequency bands, routing a larger portion of the respective mono audio signal to one of the first and second speakers; and in a second one of the at least two frequency bands, routing a larger portion of the respective mono audio signal to the other one of the first and second speakers. Applying the second processing mode involves applying cross-talk cancellation to the audio signals for the first and second speakers.
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公开(公告)号：US20190158957A1
公开(公告)日：2019-05-23
申请号：US16191123
申请日：2018-11-14
Inventor： Dirk Jeroen Breebaart , Mark David de Burgh , Nicholas Luke Appleton , Heiko Purnhagen , Mark William Gerrard , David Matthew Cooper
Abstract: A method of processing audio data for replay on a mobile device with a first speaker and a second speaker, wherein the audio data comprises a respective audio signal for each of the first and second speakers, includes: determining a device orientation of the mobile device; if the determined device orientation is vertical orientation, applying a first processing mode to the audio signals for the first and second speakers; and if the determined device orientation is horizontal orientation, applying a second processing mode to the audio signals for the first and second speakers. Applying the first processing mode involves: determining respective mono audio signals in at least two frequency bands based on the audio signals for the first and second speakers; in a first one of the at least two frequency bands, routing a larger portion of the respective mono audio signal to one of the first and second speakers; and in a second one of the at least two frequency bands, routing a larger portion of the respective mono audio signal to the other one of the first and second speakers. Applying the second processing mode involves applying cross-talk cancellation to the audio signals for the first and second speakers.
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