Dolby Laboratories Patent Grants

Reconstructing audio signals with multiple decorrelation techniques

Granted: June 27, 2017
Patent Number: 9691404
A method performed in an audio decoder for decoding M encoded audio channels representing N audio channels is disclosed. The method includes receiving a bitstream containing the M encoded audio channels and a set of spatial parameters, decoding the M encoded audio channels, and extracting the set of spatial parameters from the bitstream. The method also includes analyzing the M audio channels to detect a location of a transient, decorrelating the M audio channels, and deriving N audio…

Reconstructing audio signals with multiple decorrelation techniques and differentially coded parameters

Granted: June 27, 2017
Patent Number: 9691405
A method performed in an audio decoder for decoding M encoded audio channels representing N audio channels is disclosed. The method includes receiving a bitstream containing the M encoded audio channels and a set of spatial parameters, decoding the M encoded audio channels, and extracting the set of spatial parameters from the bitstream. The method also includes analyzing the M audio channels to detect a location of a transient, decorrelating the M audio channels, and deriving N audio…

Method for encoding audio signals, apparatus for encoding audio signals, method for decoding audio signals and apparatus for decoding audio signals

Granted: June 27, 2017
Patent Number: 9691406
The invention introduces a new concept for hierarchical coding of HOA content. A method for encoding a hierarchical audio bitstream comprises rendering a HOA input signal to surround sound, encoding the surround sound for a base layer output signal, decoding the encoded surround sound to obtain a reconstructed surround sound signal, performing dimensionality reduction on the received HOA input signal, calculating a residual between the dimensionality-reduced HOA signal and the…

System and method for backlight and LCD adjustment

Granted: June 27, 2017
Patent Number: 9692946
In one embodiment the present invention includes a display system for displaying video. The display system includes a backlight layer and an LCD layer. The display system controls the backlight layer and the LCD layer to emulate a cathode ray tube response. This emulation may be accomplished by applying a gamma function to a gamma corrected input signal. In this manner, the effects resulting from the “crushed blacks” phenomenon may be reduced.

Networking with media fingerprints

Granted: June 20, 2017
Patent Number: 9684907
An information element, uniquely related to a media fingerprint that is uniquely derived from a media content portion during play out thereof, is provided to a first web page. The first web page stores the information element with an associated first information set, which relates to one or more media fingerprints. One or more second web pages store at least a second information set, which relates to one or more media fingerprints. The first and at least second web pages are accessed and…

Image formats and related methods and apparatuses

Granted: June 20, 2017
Patent Number: 9685120
Image data may be color graded, distributed and viewed on target displays. Mappings that preserve mid-range points and mid-range contrast may be applied to view the image data for color grading and to prepare the image data for display on a target display. The image data may be expanded to exploit the dynamic range of the target display without affecting mid-tone values.

Perceptual luminance nonlinearity-based image data exchange across different display capabilities

Granted: June 20, 2017
Patent Number: 9685139
A handheld imaging device has a data receiver that is configured to receive reference encoded image data. The data includes reference code values, which are encoded by an external coding system. The reference code values represent reference gray levels, which are being selected using a reference grayscale display function that is based on perceptual non-linearity of human vision adapted at different light levels to spatial frequencies. The imaging device also has a data converter that is…

Audio control using auditory event detection

Granted: June 20, 2017
Patent Number: 9685924
In some embodiments, a method for processing an audio signal in an audio processing apparatus is disclosed. The method includes receiving an audio signal and a parameter, the parameter indicating a location of an auditory event boundary. An audio portion between consecutive auditory event boundaries constitutes an auditory event. The method further includes applying a modification to the audio signal based in part on an occurrence of the auditory event. The parameter may be generated by…

Loudness adjustment for downmixed audio content

Granted: June 20, 2017
Patent Number: 9686624
Audio content coded for a reference speaker configuration is downmixed to downmix audio content coded for a specific speaker configuration. One or more gain adjustments are performed on individual portions of the downmix audio content coded for the specific speaker configuration. Loudness measurements are then performed on the individual portions of the downmix audio content. An audio signal that comprises the audio content coded for the reference speaker configuration and downmix…

Guided color grading for extended dynamic range

Granted: June 13, 2017
Patent Number: 9679366
Novel methods and systems for color grading are disclosed. The color grading process for a visual dynamic range image can be guided by information relating to the color grading of other images such as the standard dynamic range image.

Loudness adjustment for downmixed audio content

Granted: June 13, 2017
Patent Number: 9681247
Disclosed is a non-transitory computer readable storage medium which receives, by an audio decoder (operating in a specific playback environment different from a reference channel configuration), an audio signal for the reference channel configuration. The audio signal includes audio sample data and encoder-generated loudness metadata which includes a plurality of portions of loudness metadata for a plurality of playback environments. The plurality of portions of loudness metadata…

Reconstructing audio signals with multiple decorrelation techniques and differentially coded parameters

Granted: June 6, 2017
Patent Number: 9672839
A method performed in an audio decoder for decoding M encoded audio channels representing N audio channels is disclosed. The method includes receiving a bitstream containing the M encoded audio channels and a set of spatial parameters, decoding the M encoded audio channels, and extracting the set of spatial parameters from the bitstream. The method also includes analyzing the M audio channels to detect a location of a transient, decorrelating the M audio channels, and deriving N audio…

Rendering of audio objects with apparent size to arbitrary loudspeaker layouts

Granted: June 6, 2017
Patent Number: 9674630
Multiple virtual source locations may be defined for a volume within which audio objects can move. A set-up process for rendering audio data may involve receiving reproduction speaker location data and pre-computing gain values for each of the virtual sources according to the reproduction speaker location data and each virtual source location. The gain values may be stored and used during “run time,” during which audio reproduction data are rendered for the speakers of the…

Method and system for video equalization

Granted: May 30, 2017
Patent Number: 9667910
Video equalization including performing equalization such that a sequence of images have dynamic range (optionally other characteristics) that is constant to a predetermined degree, where the input video includes high and standard dynamic range videos and images from both. Equalization is performed with a common anchor point (e.g., 20% gray level, or log mean of luminance) input video and the equalized video, and such that the images determined by the equalized video have at least…

High precision encoding and decoding of video images

Granted: May 30, 2017
Patent Number: 9667957
Methods, systems, and computer programs for improved quality video compression. Image quality from MPEG-style video coding may be improved by preserving a higher number of bits during intermediate encoding and decoding processing steps. Problems of inverse discrete cosine transform (IDCT) mismatch can be eliminated by exactly matching the IDCT function numerical algorithm of the decoder to the IDCT function numerical algorithm used for the decoding portion of the encoder. Also included…

Reduced complexity motion compensated temporal processing

Granted: May 30, 2017
Patent Number: 9667964
A method and system for reduced complexity motion compensated temporal processing for pre-analysis purposes. The processing complexity is reduced by reducing the number of pictures processed for analysis, reducing the number of references used for analysis, and/or spatially subsampling input pictures.

Predictive motion vector coding

Granted: May 30, 2017
Patent Number: 9667993
Overlapped block disparity estimation and compensation is described. Compensating for images with overlapped block disparity compensation (OBDC) involves determining if OBDC is enabled in a video bit stream, and determining if OBDC is enabled for one or more macroblocks that neighbor a first macroblock within the video bit stream. The neighboring macroblocks may be transform coded. If OBDC is enabled in the video bit stream and for the one or more neighboring macroblocks, predictions may…

Method for generating a surround sound field, apparatus and computer program product thereof

Granted: May 30, 2017
Patent Number: 9668080
Embodiments of the present invention relate to adaptive audio content generation. Specifically, a method for generating adaptive audio content is provided. The method comprises extracting at least one audio object from channel-based source audio content, and generating the adaptive audio content at least partially based on the at least one audio object. Corresponding system and computer program product are also disclosed.

Low latency and low complexity phase shift network

Granted: May 23, 2017
Patent Number: 9661190
A high performance, low complexity phase shift network may be created with one or more non-first-order all-pass recursive filters that are built on top of a plurality of first-order and/or second-order all-pass recursive filters and/or delay lines. A target time delay, whether large or small, may be specified as a constraint for a non-first-order all-pass recursive filter. A target phase response may be determined for the non-first-order all-pass recursive filter. Phase errors between…

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

Granted: May 16, 2017
Patent Number: 9653085
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…