Individual Sound Zone Volume Control via Frequency Segregation
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Solution Overview
Problem
Existing individual sound zone systems lack independent volume control for each listening position, leading to inconsistent volume preferences and compromised audio quality when adjusting volume settings.
Innovation Solution
Implementing a system with headrest and height speakers for mid and high frequencies, and low pass filters for bass frequencies, allowing users to set distinct volume preferences for each sound zone through separate gain adjustments, while maintaining stereo quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a master volume control is used for all sound zones, then the system is simple to operate, but listeners cannot set individual volume preferences for each sound zone
Solution Approach 1:
The volume control function is segmented from a single master control into multiple independent zone-specific controls. Each sound zone (front left, front right, rear left, rear right) has its own volume control button, allowing individual listeners to adjust volume independently while maintaining system simplicity.
Solution Approach 2:
A processor acts as an intermediary between the volume control buttons and the amplifiers. The processor receives zone-specific volume inputs, combines them with the master volume setting, and generates appropriate gain adjustments for each channel, enabling individual control without complex direct amplifier connections.
2Adaptability or versatility
If volume is adjusted in individual sound zones, then individual volume preference is achieved, but stereo sound quality is compromised
Solution Approach 1:
The system changes the parameter being controlled from direct amplifier gain to processor-level volume adjustments. By modifying the audio signal parameters in the processor before amplification, the system maintains stereo integrity while allowing zone-specific volume preferences through mathematical operations on the audio signal.
Solution Approach 2:
The system uses feedback from multiple microphones to monitor the actual sound field in each zone. This feedback is processed to determine appropriate volume adjustments that maintain stereo quality, allowing the system to adapt volume control based on real-time acoustic conditions rather than simple gain changes.
3Adaptability or versatility
If separate volume controls are implemented for each sound zone, then individual volume preference is achieved, but the system complexity increases
Solution Approach 1:
The processor is designed as a universal control unit that handles multiple functions: master volume adjustment, zone-specific volume control, stereo processing, and feedback analysis. This multi-functional approach consolidates what would otherwise require separate control systems for each zone, reducing overall system complexity.
Solution Approach 2:
The system merges the master volume control with individual zone volume controls into a unified processing architecture. Rather than having separate control circuits for each zone, the processor integrates all volume control functions, combining master and zone-specific adjustments through a single coherent system that reduces component count and complexity.
Data Source
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AI summary
A system and method for applying an individual volume control setting to individual sound zones as set by a user. When the individual volume control setting differs from a master volume control setting, the individual volume control setting is applied to the low frequency component of the audio signal. Headrest and optional height speakers for each individual sound zone's independent volume setting are applied to the mid and high frequency components of the audio signal.