Echo Delay Tracking via Frequency-Selective Cross-Correlation
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Solution Overview
Problem
Existing echo delay tracking methods have weak interference immunity, leading to inaccurate echo delay determination and residual echoes due to low signal-to-noise ratios.
Innovation Solution
The method involves identifying target frequencies with signal-to-noise ratios greater than a preset threshold in the current frame collection signal and performing a cross-correlation operation only on the corresponding signal components of the reference and collection signals to determine the echo delay value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cross-correlation operation is performed on all frequency components of the collection signal, then the echo delay can be determined, but the accuracy is reduced due to noise interference from low signal-to-noise ratio frequencies
Solution Approach 1:
The patent segments the collection signal into multiple frequency components through Fourier transform, then selectively processes only those frequency components whose signal-to-noise ratio exceeds a preset threshold. This segmentation allows the system to isolate and eliminate noise-affected frequency components while preserving clean signal components for echo delay determination, thereby resolving the contradiction between complete signal processing and noise rejection.
Solution Approach 2:
The patent applies different processing qualities to different frequency components based on their individual signal-to-noise ratios. Frequency components with high signal-to-noise ratios are processed with full correlation operations, while those with low signal-to-noise ratios are filtered out. This local quality differentiation ensures that only high-quality signal components contribute to the echo delay measurement, improving overall accuracy without losing useful information from clean frequency bands.
2Reliability
If signal filtering based on signal-to-noise ratio is applied, then noise components are reduced, but the complexity of the processing increases
Solution Approach 1:
The patent replaces complex mechanical or manual signal validation processes with automated computational methods. Specifically, it uses Fourier transform for frequency analysis, automatic signal-to-noise ratio calculation, and algorithmic threshold-based filtering. These computational substitutions streamline the processing pipeline, making the enhanced reliability achievable through software-based frequency domain analysis rather than complex hardware filtering or manual intervention.
Data Source
AI summary
An echo delay tracking method includes obtaining, by a computing terminal, a current frame reference signal and a current frame collection signal; and identifying target frequency information in the current frame collection signal according to signal-to-noise ratios of the current frame collection signal at a plurality of frequencies. The target frequency information includes at least one target frequency that corresponds to a signal-to-noise ratio greater than a first preset threshold. The method also includes determining whether the current frame collection signal is a valid frame signal based on the target frequency information; and if yes, performing a cross-correlation operation of a signal component of the current frame reference signal corresponding to the target frequency and a signal component of the current frame collection signal corresponding to the target frequency. An echo delay value can be obtained according to a result of the cross-correlation operation.