Dolby Laboratories Licensing Corporation

Other

Dolby International Ab

Louis Dunn Fielder

Grant Allen Davidson

Mark Franklin Davis

Alan Jeffrey Seefeldt

Nicolas R Tsingos

Mark Stuart Vinton

Zhiwei Shuang

Xiguang Zheng

Sunil Bharitkar

Peter Michaelian

Brett Graham Crockett

Daniel C Wiggins

Matthew Conrad Fellers

Gareth James Selfe

Michael J Rockwell

David S McGrath

C Phillip Brown

Charles Quito Robinson

Craig C Todd

Lucas E Saule

Richard Louis Weisman

Stephen Decker Vernon

Antonio Mateos Sole

Michael Mead Truman

Joshua Brandon Lando

Rhonda J Wilson

Giulio Cengarle

Kenneth James Gundry

Brian David Link

Marina Bosi-Goldberg

Douglas Walter Hansen

Craig Campbell Todd

David S Mcgrath

The present disclosure relates to the field of audio coding, in particular, it relates to a method for encoding audio signals through a masking model based on a hearing threshold of frequency intervals of the audio signal and a measured energy of the audio signal for the corresponding frequency intervals. The disclosure further relates to an encoder that is capable of carrying out the audio encoding method.

Psychoacoustic model for audio processing

The present disclosure relates to reverberation generation for headphone virtualization. A method of generating one or more components of a binaural room impulse response (BRIR) for headphone virtualization is described. In the method, directionally-controlled reflections are generated, wherein directionally-controlled reflections impart a desired perceptual cue to an audio input signal corresponding to a sound source location. Then at least the generated reflections are combined to obtain the one or more components of the BRIR. Corresponding system and computer program products are described as well.

Reverberation generation for headphone virtualization

Some headphone systems include two ear cups, a headband assembly, an interface system and a control system. Each ear cup may include an ear cup enclosure, an ear pad assembly, a speaker system and a hinge assembly. The hinge assembly may be disposed within the ear cup enclosure such that it is not visible from outside the ear cup. The headband assembly may connect with each of the ear cups via the hinge assembly. The interface system may include at least one interface and a plurality of input source buttons disposed on at least one of the ear cups. Each of the input source buttons may be configured for selecting a source of audio data received via the at least one interface. The control system may be configured for controlling the speaker system to reproduce audio data received via the interface and selected by one of the input source buttons.

Headphones and headphone systems

A method of calibrating a feedback-based noise cancellation system of an ear device may involve obtaining a measured plant response of the ear device, obtaining a reference plant response value and determining a plant response variation between the reference plant response value and a value corresponding to the measured plant response. The method may involve obtaining a measured a coupler response of the ear device, obtaining a reference coupler response value and determining a coupler response variation between the reference coupler response value and a value corresponding to the measured coupler response. The method may involve determining, based at least in part on the plant response variation and the coupler response variation, a microphone signal gain correction factor and applying the microphone signal gain correction factor to ear device microphone signals that are input to a feedback loop of the feedback-based noise cancellation system.

Auto calibration of an active noise control system

Headphone system including two ear cups (), a headband assembly (), an interface system () and a control system (). Each ear cup () includes an ear cup enclosure (), an ear pad assembly (), a speaker system () and a hinge assembly (). The hinge assembly () is disposed within the ear cup enclosure () such that it is not visible from outside the ear cup (). The headband () assembly connects with each of the ear cups () via the hinge assembly (). The interface system () includes at least one interface and a plurality of input source buttons () disposed on at least one of the ear cups (). Each of the input source buttons () is configured for selecting a source of audio data received via the at least one interface. The control system () is configured for controlling the speaker system () to reproduce audio data received via the interface and selected by one of the input source buttons ().

Embodiments are described for designing a filter in a magnitude domain performing an impedance filtering function over a frequency domain to compensate for directional cues for the left and right ears of the listener as a function of virtual source angles during headphone virtual sound reproduction. The filter is derived by obtaining blocked ear canal and open ear canal transfer functions for loudspeakers placed in a room, obtaining an open ear canal transfer function for a headphone placed on a listening subject, and dividing the loudspeaker transfer functions by the headphone transfer function to invert a headphone response at the entrance of the ear canal and map the ear canal function from the headphone to free field.

Impedance matching filters and equalization for headphone surround rendering

In some embodiments, a method for monitoring speakers within an audio playback system (e.g., movie theater) environment. In typical embodiments, the monitoring method assumes that initial characteristics of the speakers (e.g., a room response for each of the speakers) have been determined at an initial time, and relies on one or more microphones positioned in the environment to perform a status check on each of the speakers to identify whether a change to at least one characteristic of any of the speakers has occurred since the initial time. In other embodiments, the method processes data indicative of output of a microphone to monitor audience reaction to an audiovisual program. Other aspects include a system configured (e.g., programmed) to perform any embodiment of the inventive method, and a computer readable medium (e.g., a disc) which stores code for implementing any embodiment of the inventive method.

Audio playback system monitoring

In some embodiments, a method for automatic detection of polarity of speakers, e.g., speakers installed in cinema environments. In some embodiments, the method determines relative polarities of a set of speakers (e.g., loudspeakers and/or drivers of a multi-driver loudspeaker) using a set of microphones, including by measuring impulse responses, including an impulse response for each speaker-microphone pair; clustering the speakers into a set of groups, each group including at least two of the speakers which are similar to each other in at least one respect; and for each group, determining and analyzing cross-correlations of pairs of impulse responses (e.g., pairs of processed versions of impulse responses) of speakers in the group to determine relative polarities of the speakers. Other aspects include systems configured (e.g., programmed) to perform any embodiment of the inventive method, and computer readable media (e.g., discs) which store code for implementing any embodiment of the inventive method.

Automatic loudspeaker polarity detection

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Millbrae, CA, United States of America

Louis Dunn Fielder