Room Impulse Response Processing With Correlation-Scaled Reverberation
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Solution Overview
Problem
Conventional methods for processing audio signals based on room impulse responses fail to accurately separate and process early reverberation and late reverberation, leading to deviations from the full-convolution result, and do not adequately preserve the influence of the input audio signal on the reverberation level.
Innovation Solution
A method that separately processes audio signals with an early part and late reverberation of the room impulse response, generating a scaled reverberated signal by setting or calculating a gain factor based on the audio signal's correlation measure, allowing for accurate scaling of the late reverberation to match the full-convolution approach without requiring extensive hearing models or additional models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the audio signal is processed separately with early part and late reverberation of the room impulse response, then the computational complexity is reduced, but the accuracy of the reverberation level deviates from the full-convolution result
Solution Approach 1:
The patent applies parameter changes by introducing a gain factor that scales the late reverberation signal based on the correlation measure of the input audio signal. This parameter adjustment allows the separately processed late reverberation to match the perceived level of the full-convolution approach, resolving the accuracy issue while maintaining computational efficiency
Solution Approach 2:
The patent implements feedback by calculating the correlation measure of the input audio signal and using this information to adjust the gain factor applied to the late reverberation. This feedback mechanism ensures that the scaled late reverberation accurately reflects the influence of the input signal, matching the full-convolution result without requiring extensive hearing models
2Measurement precision
If a full-convolution approach is used to process the audio signal with the complete impulse response, then the accuracy of the reverberation level is preserved, but the computational overhead increases significantly
Solution Approach 1:
The patent applies segmentation by dividing the room impulse response into two separate parts: early reflections and late reverberation. The early reflections are processed with the complete impulse response to maintain accuracy, while the late reverberation is processed separately with scaling based on correlation measure. This segmentation reduces computational overhead while preserving the accuracy of the overall reverberation effect
3Device complexity
If the gain factor is set with a fixed value determined empirically, then the computational complexity is reduced, but the adaptability to different audio signals is limited
Solution Approach 1:
The patent applies dynamics by making the gain factor adaptive rather than fixed. The gain factor is calculated based on the correlation measure of the input audio signal, allowing it to dynamically adjust to different types of audio content. This provides versatility across different audio signals while maintaining reasonable computational complexity through the use of correlation analysis
Data Source
AI summary
A method for processing an audio signal in accordance with a room impulse response is described. The audio signal is processed with an early part of the room impulse response separate from a late reverberation of the room impulse response, wherein the processing of the late reverberation has generating a scaled reverberated signal, the scaling being dependent on the audio signal. The processed early part of the audio signal and the scaled reverberated signal are combined.