Apparatus and Method for Processing Stereo Signals for Reproduction in Cars to Achieve Individual Three-Dimensional Sound by Frontal Loudspeakers

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This invention relates to an apparatus and method for processing stereo (or multi-channel) audio signals to provide an enhanced three-dimensional (3D) sound experience for occupants of vehicles, using mainly the front loudspeakers. A digital processor extracts ambient elements from incoming audio, applies spatial and binaural effects to recreate width, height, and a sense of being enveloped by sound, and then combines these effects with the original signal, achieving immersive and customizable 3D audio with reduced system complexity compared to traditional multi-loudspeaker systems.

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• Upgrading car audio systems to provide immersive 3D sound for different seats (driver and passengers) using mainly frontal loudspeakers.
• Applying personalized sound environments in shared vehicle cabins (e.g., taxis, shared rides, autonomous vehicles).
• Adapting standard stereo music or navigation instructions for enhanced clarity and realism in automotive settings.
• Developing advanced automotive infotainment systems with spatial audio capabilities.
• Integrating into after-market or OEM car audio products to differentiate high-end vehicle offerings.

BenefitsContent extracted from patent full text and abstract with AI.

• Creates a 3D and enveloping soundstage using minimal loudspeakers, reducing weight, cost, and installation complexity.
• Delivers individual spatial audio experiences to different listening positions (e.g., driver and passenger), improving comfort and enjoyment for all occupants.
• Enhances the perceived width, height, and depth of sound, making music and alerts more immersive and natural.
• Reduces the need for numerous cables, amplifiers, and complex hardware found in typical multi-channel car systems.
• Offers adjustability and adaptability to different cabin layouts and user preferences through digital signal processing.

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Patent Abstract

Apparatus and method for processing stereo signals for reproduction in cars to achieve individual three-dimensional sound by frontal loudspeakers Embodiments provide a digital processor (100) comprising an ambient portion extractor (102) and a spatial effect processing stage (104). The ambient portion extractor (102) is configured to extract an ambient portion from a multi-channel signal. The spatial effect processing stage (104) is configured to generate a spatial effect signal based on the ambient portion of the multi-channel signal. The digital processor (100) is configured to combine (116) the multi-channel signal or a processed version thereof with the spatial effect signal.