Audio Signal Correlation Compensation
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Solution Overview
Problem
Audio processing systems face challenges in maintaining consistent audio levels when mixing digital signals due to correlation effects, leading to amplitude variations that can result in louder or softer playback than intended.
Innovation Solution
An audio processing method that detects correlations between input digital audio signals, generates gain adjustments to compensate for these effects, and applies them to ensure consistent output levels by adjusting the gain of each signal before mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If digital audio signals are mixed directly without correlation detection, then the mixing process is simple and fast, but the output audio levels become inconsistent due to correlation effects
Solution Approach 1:
The patent applies preliminary action by detecting correlations between audio signals and calculating compensation gains before the mixing operation. This pre-processing step ensures that when signals are later combined, the correlation-induced level variations are already compensated, resulting in consistent output levels without requiring complex real-time adjustment during mixing.
Solution Approach 2:
The patent implements feedback by using the detected correlation information to generate compensatory gain adjustments. The system measures the correlation between input signals, calculates the appropriate compensation, and applies this feedback in the form of gain adjustments to prevent the harmful correlation effects from manifesting in the final mixed output.
2Manufacturing precision
If correlation detection and gain adjustment are applied to all input signals, then output level consistency is improved, but processing time and computational load increase
Solution Approach 1:
The patent applies partial action by selectively processing only those signal pairs that exhibit significant correlation. Rather than uniformly applying correlation detection and gain adjustment to all possible signal combinations, the system identifies and processes only the correlated pairs, reducing unnecessary computational overhead while maintaining output level consistency for the problematic signals.
Data Source
AI summary
An audio processing method comprises: for each given input digital audio signal of a set of two or more input digital audio signals, detecting a correlation between the given input digital audio signal and others of the input digital audio signals; generating a gain adjustment for application to the given input digital audio signal in dependence upon the detected correlation; applying the gain adjustment to the given input digital audio signal to generate a respective gain-adjusted input digital audio signal; and combining the set of gain-adjusted input digital audio signals to generate an output digital audio signal.