HRTF Filter Distribution for Immersive Audio Bandwidth Reduction
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Solution Overview
Problem
Conventional audio systems, including Surround Sound and headphone-based three-dimensional sound systems, face challenges in providing a realistic and efficient distribution of head-related transfer function filters, which are essential for creating a immersive audio experience, often requiring significant bandwidth and computational resources.
Innovation Solution
A method and apparatus for distributing head-related transfer function filters, where a user device requests and receives personalized filters from a service, allowing the service to verify subscription status and filter audio channels, reducing bandwidth requirements by transmitting only necessary filtered audio channels, particularly optimized for headphones with two channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If personalized HRTF filters are distributed to create immersive three-dimensional audio experience, then audio realism is improved, but bandwidth requirements increase
Solution Approach 1:
The audio signal is segmented into multiple channels, each processed with specific HRTF filters. The system divides the complex three-dimensional audio rendering task into separate filterable channels that can be independently processed and then combined at the output, reducing the bandwidth required for transmitting filter data while maintaining audio realism
Solution Approach 2:
HRTF filters are pre-computed and stored based on user-specific anatomical data (ear, head, torso characteristics). By performing the computationally intensive filter design in advance rather than in real-time, the system reduces the bandwidth and processing requirements during actual audio playback while still providing personalized immersive experience
2Measurement precision
If multiple audio channels are processed with HRTF filters, then three-dimensional sound experience is improved, but computational load increases
Solution Approach 1:
The system performs computationally intensive HRTF filter design and audio channel processing in advance. Filters are pre-computed based on user anatomy, and audio channels are pre-processed with appropriate filters before distribution. This preliminary processing significantly reduces the computational load during real-time playback while maintaining high three-dimensional sound quality
Solution Approach 2:
Instead of computing unique HRTF filters for every possible listening scenario, the system creates representative filter sets that can be reused across multiple scenarios. These filter copies provide sufficient three-dimensional audio experience for various conditions without requiring full computational processing each time
3Quantity of substance
If original audio channels are transmitted without filtering, then bandwidth is saved, but audio quality and immersion are reduced
Solution Approach 1:
The system extracts only the essential filtered audio channel data that is necessary for creating three-dimensional sound experience, rather than transmitting complete multi-channel audio with all processing parameters. By extracting and transmitting only the critical filtered components, the system reduces bandwidth requirements while maintaining audio quality through efficient data selection
Data Source
AI summary
Arrangement for distributing head related transfer function filters. In the arrangement a user device sends a request for a head related transfer function filter to the service being used. The service verifies if the user of the device has a subscription for a head related transfer function filters in the service being used and retrieves a filter as a response to a positive verification result. The service may filter audio channels and transmit filtered audio further. In an alternative embodiment the service transmits the filter to the user device for filtering the audio.