Apparatus and Method for Audio Signal Transformation

Simple SummaryContent extracted from patent full text and abstract with AI.

This invention describes an apparatus and method for transforming audio signals, especially spatial audio (such as Ambisonics), by utilizing spherical harmonics information. Unlike traditional approaches that require audio signal conversions between domains (such as from spatial to spherical harmonics and back), this solution allows audio signals to be transformed—such as spatially rotated—directly within their current representation (e.g., the equivalent spatial domain) with transformation rules derived from spherical harmonics. This method is computationally more efficient and flexible, enabling precise spatial manipulation of audio without unnecessary domain switching.

Use CasesContent extracted from patent full text and abstract with AI.

• Spatial audio rendering and manipulation in virtual reality (VR) and augmented reality (AR) environments.
• Immersive 3D audio experiences in cinemas, theaters, or home entertainment systems.
• Advanced audio post-production, including soundfield rotation, noise suppression, and sound source positioning.
• Binaural rendering for headphones to create lifelike surround sound experiences.
• Teleconferencing and telepresence systems that require spatially accurate audio reproduction.
• Game audio engines requiring real-time spatial transformations of sound fields.
• Interactive installations and exhibitions featuring spatially dynamic audio content.

BenefitsContent extracted from patent full text and abstract with AI.

• Enables direct audio signal transformation in various domains without unnecessary conversions, reducing computational complexity and latency.
• Allows highly flexible and precise spatial transformations, such as soundfield rotation or directional noise suppression.
• Supports real-time, efficient operations suitable for time-sensitive applications like VR/AR or live performances.
• Reduces memory requirements by avoiding repeated domain conversions and precomputing key matrices.
• Improves the scalability and versatility of audio processing systems handling complex 3D soundfields.
• Facilitates seamless integration into existing workflows, audio encoders/decoders, and hardware or software solutions.

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Patent Abstract

An apparatus for audio signal transformation is provided. The apparatus comprises a determination unit (110) configured for determining, using spherical harmonics information, a transformation rule for transforming an audio input signal within a first domain, being different from a spherical harmonics domain. Moreover, the apparatus comprises a transformation unit (120) configured for transforming, using the transformation rule, the audio input signal, being represented in the first domain, to obtain a transformed audio signal being represented in the first domain. The spherical harmonics information comprises information on a plurality of spherical harmonics and/or comprises information being represented in the spherical harmonics domain.