Patent application number | Description | Published |
20140006017 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR GENERATING OBFUSCATED SPEECH SIGNAL | 01-02-2014 |
20140016784 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR BACKWARD-COMPATIBLE AUDIO CODING - Systems, methods, and apparatus for backward-compatible coding of a set of basis function coefficients that describe a sound field are presented. | 01-16-2014 |
20140016786 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR THREE-DIMENSIONAL AUDIO CODING USING BASIS FUNCTION COEFFICIENTS - Systems, methods, and apparatus for a unified approach to encoding different types of audio inputs are described. | 01-16-2014 |
20140016802 | LOUDSPEAKER POSITION COMPENSATION WITH 3D-AUDIO HIERARCHICAL CODING - In general, techniques are described for compensating for loudspeaker positions using hierarchical three-dimensional (3D) audio coding. An apparatus comprising or more processors may perform the techniques. The processors may be configured to perform a first transform that is based on a spherical wave model on a first set of audio channel information for a first geometry of speakers to generate a first hierarchical set of elements that describes a sound field. The processors may further be configured to perform a second transform in a frequency domain on the first hierarchical set of elements to generate a second set of audio channel information for a second geometry of speakers. | 01-16-2014 |
20140023196 | SCALABLE DOWNMIX DESIGN WITH FEEDBACK FOR OBJECT-BASED SURROUND CODEC - In general, techniques are described for grouping audio objects into clusters. In some examples, a device for audio signal processing comprises a cluster analysis module configured to group, based on spatial information for each of N audio objects, a plurality of audio objects that includes the N audio objects into L clusters, where L is less than N, wherein the cluster analysis module is configured to receive information from at least one of a transmission channel, a decoder, and a renderer, and wherein a maximum value for L is based on the information received. The device also comprises a downmix module configured to mix the plurality of audio objects into L audio streams, and a metadata downmix module configured to produce, based on the spatial information and the grouping, metadata that indicates spatial information for each of the L audio streams. | 01-23-2014 |
20140023197 | SCALABLE DOWNMIX DESIGN FOR OBJECT-BASED SURROUND CODEC WITH CLUSTER ANALYSIS BY SYNTHESIS - In general, techniques are described for grouping audio objects into clusters. In some examples, a device for audio signal processing comprises a cluster analysis module configured to, based on a plurality of audio objects, produce a first grouping of the plurality of audio objects into L clusters, wherein the first grouping is based on spatial information from at least N among the plurality of audio objects and L is less than N. The device also includes an error calculator configured to calculate an error of the first grouping relative to the plurality of audio objects, wherein the error calculator is further configured to, based on the calculated error, produce a plurality L of audio streams according to a second grouping of the plurality of audio objects into L clusters that is different from the first grouping. | 01-23-2014 |
20140025386 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR AUDIO OBJECT CLUSTERING - Systems, methods, and apparatus for grouping audio objects into clusters are described. | 01-23-2014 |
20140086416 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR THREE-DIMENSIONAL AUDIO CODING USING BASIS FUNCTION COEFFICIENTS - Systems, methods, and apparatus for a unified approach to encoding different types of audio inputs are described. | 03-27-2014 |
20140219456 | DETERMINING RENDERERS FOR SPHERICAL HARMONIC COEFFICIENTS - In general, techniques are described for determining renderers used for rendering spherical harmonic coefficients to generate one or more loudspeaker signals. A device comprising one or more processors may perform the techniques. The one or more processors may be configured to determine a local speaker geometry of one or more speakers used for playback of spherical harmonic coefficients representative of a sound field, and configure the device to operate based on the local speaker geometry. | 08-07-2014 |
20140247946 | TRANSFORMING SPHERICAL HARMONIC COEFFICIENTS - In general, techniques are described for transforming spherical harmonic coefficients. A device comprising one or more processors may perform the techniques. The processors may be configured to parse the bitstream to determine transformation information describing how the sound field was transformed to reduce a number of the plurality of hierarchical elements that provide information relevant in describing the sound field. The processors may further be configured to, when reproducing the sound field based on those of the plurality of hierarchical elements that provide information relevant in describing the sound field, transform the sound field based on the transformation information to reverse the transformation performed to reduce the number of the plurality of hierarchical elements. | 09-04-2014 |
20140249827 | SPECIFYING SPHERICAL HARMONIC AND/OR HIGHER ORDER AMBISONICS COEFFICIENTS IN BITSTREAMS - In general, techniques are described for specifying spherical harmonic coefficients in a bitstream. A device comprising one or more processors may perform the techniques. The processors may be configured to identify, from the bitstream, a plurality of hierarchical elements describing a sound field that are included in the bitstream. The processors may further be configured to parse the bitstream to determine the identified plurality of hierarchical elements. | 09-04-2014 |
20140355766 | BINAURALIZATION OF ROTATED HIGHER ORDER AMBISONICS - A device comprising one or more processors is configured to obtain transformation information, the transformation information describing how a sound field was transformed to reduce a number of a plurality of hierarchical elements to a reduced plurality of hierarchical elements; and perform binaural audio rendering with respect to the reduced plurality of hierarchical elements based on the transformation information. | 12-04-2014 |
20140355768 | PERFORMING SPATIAL MASKING WITH RESPECT TO SPHERICAL HARMONIC COEFFICIENTS - In general, techniques are described by which to perform spatial masking with respect to spherical harmonic coefficients. As one example, an audio encoding device comprising a processor may perform various aspects of the techniques. The processor may be configured to perform spatial analysis based on the spherical harmonic coefficients describing a three-dimensional sound field to identify a spatial masking threshold. The processor may further be configured to render the multi-channel audio data from the plurality of spherical harmonic coefficients, and compress the multi-channel audio data based on the identified spatial masking threshold to generate a bitstream. | 12-04-2014 |
20140355769 | ENERGY PRESERVATION FOR DECOMPOSED REPRESENTATIONS OF A SOUND FIELD - In general, techniques are described for performing a vector-based synthesis with respect to higher order ambisonic coefficients (or, in other words, spherical harmonic coefficients). A device comprising a processor may be configured to perform the techniques. The processor may perform the vector-based synthesis with respect to spherical harmonic coefficients to generate decomposed representations of the plurality of spherical harmonic coefficients and determine distinct and background directional information from the directional information. The processor may then reduce an order of the directional information associated with the background audio objects to generate transformed background directional information, and apply compensation to increase values of the transformed directional information to preserve an overall energy of the sound field. | 12-04-2014 |
20140355770 | TRANSFORMED HIGHER ORDER AMBISONICS AUDIO DATA - In general, techniques are described for obtaining one or more first vectors describing distinct components of a soundfield and one or more second vectors describing background components of the soundfield, both the one or more first vectors and the one or more second vectors generated at least by performing a transformation with respect to a plurality of spherical harmonic coefficients. | 12-04-2014 |
20140355771 | COMPRESSION OF DECOMPOSED REPRESENTATIONS OF A SOUND FIELD - In general, techniques are described for obtaining decomposed versions of spherical harmonic coefficients. In accordance with these techniques, a device comprising one or more processors may be configured to determine a first non-zero set of coefficients of a vector that represent a distinct component of a sound field, the vector having been decomposed from a plurality of spherical harmonic coefficients that describe the sound field. | 12-04-2014 |
20140355794 | BINAURAL RENDERING OF SPHERICAL HARMONIC COEFFICIENTS - A device comprises one or more processors configured to apply a binaural room impulse response filter to spherical harmonic coefficients representative of a sound field in three dimensions so as to render the sound field. | 12-04-2014 |
20140355795 | FILTERING WITH BINAURAL ROOM IMPULSE RESPONSES WITH CONTENT ANALYSIS AND WEIGHTING - A device comprising one or more processors is configured to apply adaptively determined weights to a plurality of channels of the audio signal to generate a plurality of adaptively weighted channels of the audio signal. The processors are further configured to combine at least two of the plurality of adaptively weighted channels of the audio signal to generate a combined signal. The processors are further configured to apply a binaural room impulse response filter to the combined signal to generate a binaural audio signal. | 12-04-2014 |
20140355796 | FILTERING WITH BINAURAL ROOM IMPULSE RESPONSES - A device comprising one or more processors is configured to determine a plurality of segments for each of a plurality of binaural room impulse response filters, wherein each of the plurality of binaural room impulse response filters comprises a residual room response segment and at least one direction-dependent segment for which a filter response depends on a location within a sound field; transform each of at least one direction-dependent segment of the plurality of binaural room impulse response filters to a domain corresponding to a domain of a plurality of hierarchical elements to generate a plurality of transformed binaural room impulse response filters, wherein the plurality of hierarchical elements describe a sound field; and perform a fast convolution of the plurality of transformed binaural room impulse response filters and the plurality of hierarchical elements to render the sound field. | 12-04-2014 |
20140358266 | ANALYSIS OF DECOMPOSED REPRESENTATIONS OF A SOUND FIELD - In general, techniques are described for identifying distinct audio objects from spherical harmonic coefficients (which may also be denotes as higher order ambisonic coefficients). A device comprising one or more processors may perform the techniques so as to identify the distinct audio objects from the spherical harmonic coefficients (SHC) associated with the audio objects based on a directionality determined for one or more of the audio objects. | 12-04-2014 |
20140358557 | PERFORMING POSITIONAL ANALYSIS TO CODE SPHERICAL HARMONIC COEFFICIENTS - In general, techniques are described for performing a positional analysis to code audio data. Typically, this audio data comprises a hierarchical representation of a soundfield and may include, as one example, spherical harmonic coefficients (which may also be referred to as higher-order ambisonic coefficients). An audio compression device that includes one or more processors may perform the techniques. The processors may be configured to allocate bits to one or more portions of the audio data, at least in part by performing positional analysis on the audio data. | 12-04-2014 |
20140358558 | IDENTIFYING SOURCES FROM WHICH HIGHER ORDER AMBISONIC AUDIO DATA IS GENERATED - In general, techniques are described for obtaining an indication of whether spherical harmonic coefficients are representative of a synthetic audio object. In accordance with the techniques, a device comprising one or more processors may be configured to obtain an indication of whether spherical harmonic coefficients representative of a sound field are generated from a synthetic audio object. | 12-04-2014 |
20140358559 | COMPENSATING FOR ERROR IN DECOMPOSED REPRESENTATIONS OF SOUND FIELDS - In general, techniques are described for compensating for error in decomposed representations of sound fields. In accordance with the techniques, a device comprising one or more processors may be configured to quantize one or more first vectors representative of one or more components of a sound field, and compensate for error introduced due to the quantization of the one or more first vectors in one or more second vectors that are also representative of the same one or more components of the sound field. | 12-04-2014 |
20140358560 | PERFORMING ORDER REDUCTION WITH RESPECT TO HIGHER ORDER AMBISONIC COEFFICIENTS - In general, techniques are described for performing order reduction with respect to a plurality of spherical harmonic coefficients. In accordance with the techniques, a device comprising one or more processors may be configured to perform, based on a target bitrate, order reduction with respect to a plurality of spherical harmonic coefficients or decompositions thereof to generate reduced spherical harmonic coefficients or the reduced decompositions thereof, wherein the plurality of spherical harmonic coefficients represent a sound field. | 12-04-2014 |
20140358561 | IDENTIFYING CODEBOOKS TO USE WHEN CODING SPATIAL COMPONENTS OF A SOUND FIELD - In general, techniques are described for identifying a codebook to be used when compressing spatial components of a sound field. A device comprising one or more processors may be configured to perform the techniques. The one or more processors may be configured to identify a Huffman codebook to use when compressing a spatial component of a plurality of spatial components based on an order of the spatial component relative to remaining ones of the plurality of spatial components, the spatial component generated by performing a vector based synthesis with respect to a plurality of spherical harmonic coefficients. | 12-04-2014 |
20140358562 | QUANTIZATION STEP SIZES FOR COMPRESSION OF SPATIAL COMPONENTS OF A SOUND FIELD - In general, techniques are described for determining quantization step sizes for compression of spatial components of a sound field. A device comprising one or more processors may be configured to perform the techniques. In other words, the one or more processors may be configured to determine a quantization step size to be used when compressing a spatial component of a sound field, where the spatial component generated by performing a vector based synthesis with respect to a plurality of spherical harmonic coefficients. | 12-04-2014 |
20140358563 | COMPRESSION OF DECOMPOSED REPRESENTATIONS OF A SOUND FIELD - In general, techniques are described for compressing decomposed representations of a sound field. A device comprising one or more processors may be configured to perform the techniques. The one or more processors may be configured to obtain a bitstream comprising a compressed version of a spatial component of a sound field, the spatial component generated by performing a vector based synthesis with respect to a plurality of spherical harmonic coefficients. | 12-04-2014 |
20140358564 | INTERPOLATION FOR DECOMPOSED REPRESENTATIONS OF A SOUND FIELD - In general, techniques are described for performing an interpolation with respect to decomposed versions of a sound field. A device comprising one or more processors may be configured to perform the techniques. The processors may be configured to obtain decomposed interpolated spherical harmonic coefficients for a time segment by, at least in part, performing an interpolation with respect to a first decomposition of a first plurality of spherical harmonic coefficients and a second decomposition of a second plurality of spherical harmonic coefficients. | 12-04-2014 |
20140358565 | COMPRESSION OF DECOMPOSED REPRESENTATIONS OF A SOUND FIELD - In general, techniques are described for obtaining decomposed versions of spherical harmonic coefficients. A device comprising one or more processors may be configured to perform the techniques, whereby the processors may be configured to obtain, from a bitstream, at least one of one or more vectors decomposed from spherical harmonic coefficients that were recombined with background spherical harmonic coefficients, wherein the spherical harmonic coefficients describe a sound field, and wherein the background spherical harmonic coefficients described one or more background components of the same sound field. | 12-04-2014 |
20150071447 | CODING OF SPHERICAL HARMONIC COEFFICIENTS - In general, techniques are described for coding of spherical harmonic coefficients representative of a three dimensional soundfield. A device comprising a memory and one or more processors may be configured to perform the techniques. The memory may be configured to store a plurality of spherical harmonic coefficients. The one or more processors may be configured to perform an energy analysis with respect to the plurality of spherical harmonic coefficients to determine a reduced version of the plurality of spherical harmonic coefficients. | 03-12-2015 |