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Methods, apparatus and systems for encoding and decoding of directional sound sources

A coding and equipment technology, applied in stereo systems, two-channel systems, quasi-stereo systems, etc., can solve the problems that are not suitable for simplified/combined representation of multiple directional sound sources, and are not enough to represent real-world radiation patterns.

Pending Publication Date: 2020-10-20
DOLBY LAB LICENSING CORP +1
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AI Technical Summary

Problems solved by technology

These representations are insufficient to represent real-world radiation patterns and are not well suited for simplified / combined representations of multiple directional sound sources

Method used

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  • Methods, apparatus and systems for encoding and decoding of directional sound sources
  • Methods, apparatus and systems for encoding and decoding of directional sound sources
  • Methods, apparatus and systems for encoding and decoding of directional sound sources

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Embodiment Construction

[0031] Aspects of this disclosure relate to the representation and efficient coding of complex radiation patterns. Some such implementations may include one or more of the following:

[0032] 1. Represent the general sound radiation pattern as time- and frequency-dependent Nth-order coefficients of real-valued spherical harmonic function (SPH) decomposition (N>=1). This representation can also be extended to depend on the level of the playback audio signal. Contrary to the case where the directional source signal is itself an HOA-like PCM representation, the mono target signal can be encoded separately from its directional information represented as a set of time-dependent scalar SPH coefficients in the subbands.

[0033] 2. An efficient coding scheme to reduce the bit rate required to represent this information

[0034] 3. A solution to dynamically combine radiation patterns such that a scene composed of several radiating sound sources can be represented by an equivalent redu...

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Abstract

Some disclosed methods involve encoding or decoding directional audio data. Some encoding methods may involve receiving a mono audio signal corresponding to an audio object and a representation of a radiation pattern corresponding to the audio object. The radiation pattern may include sound levels corresponding to plurality of sample times, a plurality of frequency bands and a plurality of directions. The methods may involve encoding the mono audio signal and encoding the source radiation pattern to determine radiation pattern metadata. Encoding the radiation pattern may involve determining aspherical harmonic transform of the representation of the radiation pattern and compressing the spherical harmonic transform to obtain encoded radiation pattern metadata.

Description

[0001] Cross References to Related Applications [0002] This application asserts U.S. Patent Application No. 62 / 658,067, filed April 16, 2018; U.S. Patent Application No. 62 / 681,429, filed June 6, 2018; and No. 62, filed October 4, 2018 / 741,419, the entire contents of which are hereby incorporated by reference herein. technical field [0003] The present invention relates to the encoding and decoding of directional sound sources and auditory scenes based on multiple dynamic and / or moving directional sources Background technique [0004] Real-world sound sources, whether natural or man-made (speakers, musical instruments, speech, machinery) radiate sound in a non-isotropic manner. Characterizing the radiation pattern (or "directivity") of sound sources can be critical for correct rendering, especially in the context of interactive environments such as video games and virtual / augmented reality (VR / AR) applications. In these environments, users typically interact with dire...

Claims

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Application Information

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IPC IPC(8): G10L19/008H04S1/00H04S5/00
CPCG10L19/008H04S2400/11H04S2420/01H04S2420/03H04S7/302H04S2420/11
Inventor N·R·钦格斯M·R·P·托马斯C·费尔施
Owner DOLBY LAB LICENSING CORP
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