Segmented Volume Mapping for Perceptual Audio Level Control
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Solution Overview
Problem
Human perception of sound is non-linear, making existing linear volume control systems inadequate for sensitive volume adjustments, especially at quiet or loud volumes, where users require more precise control in one direction over the other.
Innovation Solution
A segmented linear approach is implemented in an audio system, dividing the volume range into zones with specific ramp up and ramp down control rates, allowing for more sensitive control in certain ranges and directions, using a volume mapping to determine step values for volume adjustments based on current levels and user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a linear volume control system is used, then the system structure is simple, but the volume control precision is insufficient at quiet or loud volumes
Solution Approach 1:
The volume control system is divided into multiple zones (e.g., quiet zone, moderate zone, loud zone) with different control rates. Each zone has its own linear mapping with optimized step values tailored to human perception characteristics at that volume range, achieving high precision without requiring a completely non-linear complex system
Solution Approach 2:
Different parts of the volume range (zones) are assigned different control characteristics. The quiet zone uses smaller step values for fine control, while the loud zone uses larger step values for faster adjustment, matching human ear sensitivity at different volumes
2Measurement precision
If a non-linear volume control is implemented to match human perception, then the volume control precision improves, but the system complexity increases
Solution Approach 1:
Instead of implementing a complex continuous non-linear function, the system segments the volume range into multiple linear zones. Each zone has simple linear mappings with predetermined step values, avoiding the complexity of non-linear calculations while achieving perceptually accurate control
Solution Approach 2:
The system changes the control parameter (step value) based on the current volume zone. By selecting from a set of predetermined step values corresponding to different zones, the system adapts to human perception characteristics without requiring complex real-time non-linear computation
3Productivity
If larger step values are used for volume adjustment, then the adjustment speed increases, but the control precision decreases
Solution Approach 1:
The step value is dynamically selected based on the current volume zone and the direction of volume change (ramp up or ramp down). The system automatically adjusts the control granularity to match the user's needs at different volume levels, achieving both speed and precision
Solution Approach 2:
The control parameter (step value) is changed according to the operating conditions (current volume zone and change direction). Predetermined step values are selected from a set of options, allowing the system to optimize between adjustment speed and precision based on the current state
Data Source
AI summary
A volume controller may maintain a volume mapping including a plurality of zones of volume level, each zone defined according to a range of included volume levels and specifying a volume ramp up control rate and a volume ramp down control rate for adjustment of volume levels within the range, determine, according to the volume mapping based on a current volume level and a direction of a requested volume change, a step value for adjusting the current volume level, and adjust the current volume level according to the step value.