Spatial Processing Stereo System for Room-Specific Audio
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Solution Overview
Problem
Current audio systems struggle to provide a natural three-dimensional listening experience with two-channel stereo signals, as they lack the ability to accurately reproduce sound reflections and often 'color' the original sound with complex parameter adjustments, which are difficult for users to optimize for specific listening rooms and music types.
Innovation Solution
A spatial processing stereo system that generates additional surround sound channels by determining coefficients and room impulse responses from limited user input parameters, allowing for intuitive control and optimization of the listening experience without altering the original sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If synthetic reverb algorithms with digital filters are used to create virtual acoustic environments, then three-dimensional listening experience is improved, but device complexity and difficulty of operation increase due to very high number of parameters needed to describe and adjust the algorithm
Solution Approach 1:
The patent transforms the complex reverb algorithm into a simplified parameter-based system where users can adjust only a few key parameters (early reflection count, late reverb amount, pre-delay time) instead of hundreds of algorithmic parameters. This maintains the three-dimensional listening experience while dramatically improving ease of operation through parameter changes.
Solution Approach 2:
The patent segments the reverb processing into distinct functional blocks: early reflection processing and late reverb processing. Each block handles specific acoustic phenomena separately, allowing independent parameter adjustment and simplifying the overall system operation while maintaining comprehensive spatial audio capability.
2Ease of operation
If pre-programmed sound fields are used to optimize for music type, then ease of operation is improved, but reliability decreases because the pre-programmed sound fields lack optimization for the actual listening room
Solution Approach 1:
The patent implements dynamic parameter adjustment where the system can adapt to different listening rooms in real-time based on user input about room dimensions and acoustic characteristics. This replaces static pre-programmed settings with dynamic, room-specific optimization while maintaining ease of operation through simple user input forms.
Solution Approach 2:
The patent incorporates feedback mechanisms where users provide information about their listening room characteristics, and the system uses this feedback to calculate optimized parameters for that specific room. This feedback loop ensures reliability by tailoring the audio processing to the actual physical space rather than using generic pre-programmed settings.
3Adaptability or versatility
If matrix of scale factors with dynamic steering is used to separate dominant direction from diffuse signals, then adaptability is improved, but reliability decreases because sound sources move undesirably and only one dominant discrete source is detected
Solution Approach 1:
The patent applies preliminary processing to separate early reflections from the direct sound and from each other before the main audio processing occurs. This preliminary action stabilizes the sound source positioning by establishing clear spatial relationships early in the signal processing chain, preventing subsequent dynamic steering from causing undesirable sound source movement.
Data Source
AI summary
A spatial processing stereo system (“SPSS”) that receives audio signals and a limited number of user input parameters associated with the spatial attributes of a room, such as “room size”, “stage distance”, and “stage width”. The input parameters are used to define a listening room and generate coefficients, room impulse responses, and scaling factors that are used generate additional surround signals.