Dynamic Multichannel Audio Alignment via Phase Difference Analysis
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Solution Overview
Problem
Multichannel audio data often experiences misalignment due to factors like recording head position, tape tension, and microphone placement, leading to time delays that degrade audio quality, and conventional alignment techniques only apply a constant delay, which is insufficient for dynamic misalignment issues.
Innovation Solution
A computer-implemented method that separates audio data into blocks, calculates misalignment using phase differences across frequency bands, and aligns channels by applying a delay based on these calculations, with a smoothing function to transition between blocks, allowing for dynamic correction of audio channel misalignment over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a constant delay is applied to audio channels for alignment, then the alignment process is simple, but it cannot correct dynamic misalignment that varies over time
Solution Approach 1:
The patent transforms the static constant delay approach into a dynamic time-varying delay system. The delay amount is continuously adjusted based on real-time phase difference measurements across frequency bands, allowing the system to adapt to changing misalignment conditions while maintaining operational simplicity through automated control.
Solution Approach 2:
The system changes the delay parameter dynamically over time based on measured phase differences. By continuously monitoring and adjusting the delay amount according to actual misalignment conditions, the system achieves both simplicity (through parameter-based control) and adaptability (through time-varying adjustments).
2Measurement precision
If high-resolution synchronization is achieved by processing audio data in fine time blocks, then alignment precision improves to within 1/1000th of a sample, but computational complexity increases
Solution Approach 1:
The audio data is divided into sequential time blocks for processing. Each block is analyzed independently to determine phase differences and calculate appropriate delays. This segmentation enables high-resolution precision within each block while managing computational complexity through localized processing rather than analyzing the entire audio stream at once.
Solution Approach 2:
The system applies smoothing functions that transition between blocks using only a portion of the calculated delay values. This partial action approach achieves high precision where needed while reducing overall computational complexity by not requiring full processing of all possible delay combinations across the entire audio signal.
3Measurement precision
If phase difference calculation is performed across multiple frequency bands for each block, then misalignment detection accuracy improves, but processing time increases
Solution Approach 1:
The frequency spectrum is divided into multiple bands, and phase differences are calculated independently for each band within every time block. This segmentation allows accurate detection of frequency-specific misalignment while managing processing time through parallel or sequential band-by-band analysis rather than requiring full-spectrum analysis at every moment.
Solution Approach 2:
The system performs phase difference calculations periodically across frequency bands for each time block in a systematic sequence. This periodic action structure enables comprehensive multi-band analysis for accurate misalignment detection while controlling processing time through regular, predictable computation cycles.
Data Source
AI summary
Systems, methods, and apparatus, including computer program products, for audio editing are provided. In some implementations, a method is provided. The method includes receiving audio data having a first audio channel and a second audio channel. The audio data is separated, into a plurality of blocks. An amount of misalignment is determined between the first audio channel and the second audio channel for the portion of the audio data in each block using a phase difference between the first and second audio channels for each of a plurality of frequency bands. The first and second channels are aligned using the determined misalignment.