Decentralized Spatial Audio Decoder for Scalable Multichannel Systems
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Solution Overview
Problem
Current multichannel audio reproduction systems face limitations in scalability and flexibility due to the need for increased wireless transmission bandwidth and the use of specialized components when adding more audio channels, which raises costs, power consumption, and size issues.
Innovation Solution
A decentralized decoding method where a multichannel audio signal is broadcast and decoded across multiple receiving units, allowing each unit to process only the relevant audio signals for its position, using generic components and enabling an arbitrary number of output channels, thus reducing manufacturing costs and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If more audio channels are added to multichannel audio reproduction systems, then the audio immersion and envelopment are improved, but the wireless transmission bandwidth requirement increases
Solution Approach 1:
The multichannel audio signal is divided into multiple independent downmixed signals, each corresponding to a specific spatial position. Each speaker receives and processes only the downmixed signal relevant to its position, rather than transmitting the entire multichannel signal to all speakers. This segmentation allows arbitrary number of output channels while maintaining limited wireless bandwidth requirements.
2Adaptability or versatility
If more audio channels are added to multichannel audio reproduction systems, then the audio immersion and envelopment are improved, but the system cost increases
Solution Approach 1:
Each speaker unit is designed as a generic, universal device capable of reproducing audio from any spatial position. The same speaker hardware and downmixing algorithm are used regardless of the total number of channels in the system. This universality eliminates the need for specialized components when scaling the system, reducing manufacturing costs while allowing arbitrary number of output channels.
3Adaptability or versatility
If more audio channels are added to multichannel audio reproduction systems, then the audio immersion and envelopment are improved, but the power consumption increases
Solution Approach 1:
The patent extracts and processes only the specific downmixed signal relevant to each speaker's position, rather than processing and transmitting all multichannel signals to all speakers. Each speaker unit processes a subset of the audio information necessary for its specific spatial role, reducing overall computational load and power consumption while enabling arbitrary number of output channels.
4Adaptability or versatility
If more audio channels are added to multichannel audio reproduction systems, then the audio immersion and envelopment are improved, but the system size increases
Solution Approach 1:
The system uses identical generic speaker units regardless of the total number of channels. Each unit has the same form factor and component set, and the system scales by adding more of the same units rather than increasing the size of individual components. This universality allows arbitrary number of output channels while keeping individual system unit sizes constant.
Data Source
AI summary
This invention describes a method for decentralized decoding of a multichannel audio signal by broadcasting the original encoded data and distributing the decoding process between a plurality of receiving units. This allows for the design and manufacture of scalable multichannel audio reproduction systems having an arbitrary number of output channels, composed of a plurality of generic decoder and loudspeaker units each generating fewer output channels. With distributed decoding, a manufacturer can use “off-the-shelf” stereo or mono signal processors, digital-to-analog converters and amplifier components in each generic decoding module, thus reducing manufacturing costs and complexity requirements for each module while offering unlimited scalability in the total number of output channels.