公开(公告)号：US20180130480A1

公开(公告)日：2018-05-10

申请号：US15563936

申请日：2016-04-01

Applicant: Dolby International AB

Inventor： Heiko PURNHAGEN ,  Per EKSTRAND ,  Harald MUNDT ,  Klaus PEICHL

IPC: G10L19/035 ,  G10L19/02

CPC classification number: G10L19/035 ,  G10L19/0204 ,  G10L21/0316 ,  G10L2019/0002 ,  G10L2019/0004

Abstract: Disclosed are some examples of systems, apparatus, methods and computer program products implementing techniques for extending the range of a set of decoded parameter values for a sequence of frequency bands in an identifiable time frame of an audio signal. In some implementations, the parameter values vary in relation to a sequence of time frames of the audio signal and in relation to a sequence of frequency bands in each time frame. In some implementations, it is determined that a decoded value corresponds to a minimum of a first range of values of a first coding protocol of a set of coding protocols. The determined value is modified to be below the minimum of the first range of values to produce an extended value. A modified set of decoded values including one or more extended values can thus be provided.

公开(公告)号：US20170372707A1

公开(公告)日：2017-12-28

申请号：US15533625

申请日：2015-12-08

Applicant: DOLBY INTERNATIONAL AB

Inventor： Arijit BISWAS ,  Tobias FRIEDRICH ,  Klaus PEICHL

IPC: G10L19/005 ,  G10L19/02

Abstract: An error-concealing audio decoding method comprises: receiving a packet comprising a set of MDCT coefficients encoding a frame of time-domain samples of an audio signal; identifying the received packet as erroneous; generating estimated MDCT coefficients to replace the set of MDCT coefficients of the erroneous packet, based on corresponding MDCT coefficients associated with a received packet directly preceding the erroneous packet; assigning signs of a first subset of MDCT coefficients of the estimated MDCT coefficients, wherein the first subset comprises such MDCT coefficients that are associated with tonal-like spectral bins, to coincide with signs of corresponding MDCT coefficients of said preceding packet; randomly assigning signs of a second subset of MDCT coefficients of the estimated MDCT coefficients, wherein the second subset comprises MDCT coefficients associated with noise-like spectral bins; replacing the erroneous packet by a concealment packet containing the estimated MDCT coefficients and the signs assigned.

公开(公告)号：US20210090580A1

公开(公告)日：2021-03-25

申请号：US17114192

申请日：2020-12-07

Applicant: DOLBY INTERNATIONAL AB

Inventor： Klaus PEICHL ,  Tobias FRIEDRICH ,  Robin THESING ,  Heiko PURNHAGEN ,  Martin WOLTERS

IPC: G10L19/008 ,  H04S3/00 ,  H04S7/00

Abstract: A method for rendering an audio output based on an audio data stream including M audio signals, side information including a series of reconstruction instances of a reconstruction matrix C and first timing data, the side information allowing reconstruction of N audio objects from the M audio signals, and object metadata defining spatial relationships between the N audio objects. The method includes generating a synchronized rendering matrix based on the object metadata, the first timing data, and information relating to a current playback system configuration, the synchronized rendering matrix having a rendering instance for each reconstruction instance, multiplying each reconstruction instance with a corresponding rendering instance to form a corresponding instance of an integrated rendering matrix, and applying the integrated rendering matrix to the audio signals in order to render an audio output.

公开(公告)号：US20200005801A1

公开(公告)日：2020-01-02

申请号：US16486493

申请日：2018-03-06

Applicant: DOLBY INTERNATIONAL AB

Inventor： Klaus PEICHL ,  Tobias FRIEDRICH ,  Robin THESING ,  Heiko PURNHAGEN ,  Martin WOLTERS

IPC: G10L19/008 ,  H04S3/00 ,  H04S7/00

Abstract: A method for rendering an audio output based on an audio data stream including M audio signals, side information including a series of reconstruction instances of a reconstruction matrix C and first timing data, the side information allowing reconstruction of N audio objects from the M audio signals, and object metadata defining spatial relationships between the N audio objects. The method includes generating a synchronized rendering matrix based on the object metadata, the first timing data, and information relating to a current playback system configuration, the synchronized rendering matrix having a rendering instance for each reconstruction instance, multiplying each reconstruction instance with a corresponding rendering instance to form a corresponding instance of an integrated rendering matrix, and applying the integrated rendering matrix to the audio signals in order to render an audio output.

公开(公告)号：US20170270939A1

公开(公告)日：2017-09-21

申请号：US15459269

申请日：2017-03-15

Applicant: Dolby International AB

Inventor： Harald MUNDT ,  Klaus PEICHL ,  Wolfgang A. SCHILDBACH

IPC: G10L19/02 ,  G10L19/00 ,  G10L19/26 ,  G10L19/008 ,  G10L21/0316

CPC classification number: G10L19/0204 ,  G10L19/0017 ,  G10L19/008 ,  G10L19/26 ,  G10L21/00 ,  G10L21/0316 ,  H03H17/0621 ,  H03H17/0685

Abstract: A method (500) for resampling an audio signal (110) is described. The method (500) comprising providing (501) a set of input subband signals (210) which is representative of a time domain audio signal. Furthermore, the method (500) comprises applying (502) a first ripple pre-emphasis gain (323) to a first input subband signal (210) of the set of input subband signals (210) to determine a corresponding first output subband signal (213) of a set of output subband signals (213). In addition, the method (500) comprises determining (503) a time domain input audio signal (110) from the set of output subband signals (213). The method (500) further comprises performing (504) time domain resampling of the input audio signal (110) to provide an output audio signal (113) using an anti-aliasing filter (102), wherein the first ripple pre-emphasis gain (323) is dependent on a frequency response (311) of the anti-aliasing filter (102), such that an amplitude ripple of the frequency response (311) of the anti-aliasing filter (102) is at least partially compensated by the first ripple pre-emphasis gain (323).