Dolby Laboratories Licensing Corporation

Blackberry Corporation

2236008 Ontario Limited

Michael Mead Truman

Mark Stuart Vinton

Joe Mammone

Grant Allen Davidson

Matthew Conrad Fellers

Stephen Decker Vernon

Matthew Aubrey Watson

Charles Quito Robinson

Robert Loring Andersen

Brian Timothy Lennon

Brett Graham Crockett

Michael John Smithers

Louis Dunn Fielder

Kenneth James Gundry

Phillip Williams

Brian Lennon

Philip Anthony Williams

Michael J Smithers

Stephen D Vernon

Stephan Decker Vernon

In some examples, a first device receives a stream of application audio data, encodes the stream of application audio data, and in response to detecting an end of the stream of application audio data, provides pre-encoded filler audio data from a buffer in the first device as an encoded stream of filler audio data. The first device transmits the encoded stream of application audio data and the encoded stream of filler audio data in an encoded output data stream over a transport to a second device.

Encoded output data stream transmission

In some examples, an audio sending device receives a stream of application audio data, encodes the stream of application audio data, and in response to detecting an end of the stream of application audio data, provides pre-encoded filler audio data from a buffer in the audio sending device as an encoded stream of filler audio data. The audio sending device transmits the encoded stream of application audio data and the encoded stream of filler audio data in an encoded output data stream over a transport to an audio receiving device.

According to an aspect of the present invention, a method for reconstructing an audio signal having a baseband portion and a highband portion is disclosed. The method includes obtaining a decoded baseband audio signal by decoding an encoded audio signal and obtaining a plurality of subband signals by filtering the decoded baseband audio signal. The method further includes generating a high-frequency reconstructed signal by copying a number of consecutive subband signals of the plurality of subband signals and obtaining an envelope adjusted high-frequency signal. The method further includes generating a noise component based on a noise parameter. Finally, the method includes adjusting a phase of the high-frequency reconstructed signal and obtaining a time-domain reconstructed audio signal by combining the decoded baseband audio signal and the combined high-frequency signal to obtain a time-domain reconstructed audio signal.

Methods, apparatus and systems for determining reconstructed audio signal

A system, apparatus and a method for transmitting continuous audio data configured to mitigate data discontinuities in a receiving device. The method may mitigate data discontinuities by transmitting a continuous stream of audio data that has reduced changes to the audio data characteristics. The method may transmit filler audio data when no application audio data is available. The application audio data and the filler audio data are processed to reduce changes to the audio data characteristics in each stream.

System, apparatus and method for transmitting continuous audio data

High frequency regeneration of an audio signal with phase adjustment

A method and system for reconstructing an original audio signal is disclosed. The original audio signal has a baseband up to a cutoff frequency and high-frequency components not included in the baseband above the cutoff frequency. The system includes a bitstream deformatter that extracts a representation of the baseband, an estimated spectral envelope, and noise-blending parameters from an audio bitstream. The system also includes a spectral component regenerator that copies or translates all or at least some of the baseband spectral components to non-overlapping frequency ranges of the high-frequency components not included in the baseband to generate regenerated spectral components. The system further includes a gain adjuster that modifies a spectral envelope of the regenerated spectral components based at least in part on the estimated spectral envelope and the noise-blending parameters to generate gain-adjusted regenerated spectral components.

Reconstructing an audio signal having a baseband and high frequency components above the baseband

A method for generating a reconstructed audio signal having a baseband portion and a highband portion is disclosed. The method includes extracting temporal envelope information and spectral components of the baseband portion. The method further includes obtaining a decoded baseband audio signal. The obtaining includes filtering in a frequency domain at least some of the spectral components of the baseband portion with the reconstruction filter using the temporal envelope information to shape a temporal envelope of the baseband portion. The method also includes extracting a noise parameter and an estimated spectral envelope of the highband portion and obtaining a plurality of subband signals by filtering the decoded baseband audio signal. The method further includes generating a high-frequency reconstructed signal by copying a number of consecutive subband signals of the plurality of subband signals and obtaining an envelope adjusted high-frequency signal by adjusting, based on the estimated spectral envelope of the highband portion, a spectral envelope of the high-frequency reconstructed signal.

High frequency regeneration of an audio signal with temporal shaping

A method for generating a reconstructed audio signal having a baseband portion and a highband portion is disclosed. The method includes deformatting an encoded audio signal into a first part and a second part and extracting, from the first part, temporal envelope information and spectral components of the baseband portion. The method further includes decoding the first part to obtain a decoded baseband audio signal. The decoding includes filtering in a frequency domain at least some of the spectral components of the baseband portion with the reconstruction filter using the temporal envelope information to shape a temporal envelope of the baseband portion. The method also includes extracting, from the second part, a noise parameter and an estimated spectral envelope of the highband portion and obtaining a plurality of subband signals by filtering the decoded baseband audio signal. The method further includes generating a high-frequency reconstructed signal by copying a number of consecutive subband signals of the plurality of subband signals and obtaining an envelope adjusted high-frequency signal by adjusting, based on the estimated spectral envelope of the highband portion, a spectral envelope of the high-frequency reconstructed signal.

A method for generating a reconstructed audio signal having a baseband portion and a highband portion is disclosed. The method includes deformatting an encoded audio signal into a first part and a second part and obtaining a decoded baseband audio signal by decoding the first part. The method also includes extracting, from the second part, a noise parameter and an estimated spectral envelope of the highband portion and obtaining a plurality of subband signals by filtering the decoded baseband audio signal. The method further includes generating a high-frequency reconstructed signal by copying in a circular manner a number of consecutive subband signals of the plurality of subband signals and obtaining an envelope adjusted high-frequency signal by adjusting, based on the estimated spectral envelope of the highband portion, a spectral envelope of the high-frequency reconstructed signal. The method also includes generating a noise component based on the noise parameter and obtaining a combined high-frequency signal by adding the noise component to the envelope adjusted high-frequency signal. Finally, the method includes obtaining a time-domain reconstructed audio signal by combining the decoded baseband audio signal and the combined high-frequency signal. The method may be implemented by an audio decoding device comprising one or more hardware elements.

High frequency regeneration of an audio signal by copying in a circular manner

According to an aspect of the present invention, a method for reconstructing an audio signal having a baseband portion and a highband portion is disclosed. The method includes obtaining a decoded baseband audio signal by decoding an encoded audio signal and obtaining a plurality of subband signals by filtering the decoded baseband audio signal. The method further includes generating a high-frequency reconstructed signal by copying in a circular manner a number of consecutive subband signals of the plurality of subband signals and obtaining an envelope adjusted high-frequency signal by adjusting, based on an estimated spectral envelope of the highband portion, a spectral envelope of the high-frequency reconstructed signal. The method further includes generating a noise component based on a noise parameter and obtaining a combined high-frequency signal by adding the noise component to the envelope adjusted high-frequency signal. Finally, the method includes obtaining a time-domain reconstructed audio signal by combining the decoded baseband audio signal and the combined high-frequency signal to obtain a time-domain reconstructed audio signal. The method may be implemented by an audio decoding device comprising one or more hardware elements.

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Chevy Chase, MD, United States of America

Michael Mead Truman