Audio Filterbank Decorrelation Using a Single Linear Mixer
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Solution Overview
Problem
Conventional audio filterbanks that perform decorrelation processing require multiple linear mixers, leading to higher latency in audio signal processing.
Innovation Solution
Implementing a single linear mixer in an audio filterbank with decorrelating components, using a composite frequency-domain gain vector formed by augmenting component vectors with decorrelated components to achieve decorrelation, thereby reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple linear mixers are used to perform decorrelation processing, then decorrelation effect is achieved, but processing latency increases
Solution Approach 1:
The patent combines multiple linear mixers into a single linear mixer by integrating decorrelation processing directly into the filterbank structure. The transfer function includes both direct components and decorrelated components within one mixer, eliminating the need for separate decorrelation processing stages and reducing overall system latency.
Solution Approach 2:
The single linear mixer is designed to perform multiple functions simultaneously: it executes both the direct audio signal mixing and the decorrelation processing operations. This multi-functional approach allows the system to achieve decorrelation effects while maintaining lower latency compared to conventional multi-mixer architectures.
2Reliability
If multiple linear mixers are used for decorrelation processing, then decorrelation is achieved, but device complexity increases
Solution Approach 1:
The patent merges multiple linear mixers into a single linear mixer by integrating decorrelation processing directly into the filterbank structure. The transfer function includes both direct components and decorrelated components within one mixer, eliminating the need for separate decorrelation processing stages and reducing overall system latency.
Solution Approach 2:
The single linear mixer is designed to perform multiple functions simultaneously: it executes both the direct audio signal mixing and the decorrelation processing operations. This multi-functional approach allows the system to achieve decorrelation effects while maintaining lower latency compared to conventional multi-mixer architectures.
Data Source
AI summary
An multi-input, multi-output audio process is implemented as a linear system for use in an audio filterbank to convert a set of frequency-domain input audio signals into a set of frequency-domain output audio signals. A transfer function from one input to one output is defined as a frequency dependent gain function. In some implementations, the transfer function includes a direct component that is substantially defined as a frequency dependent gain, and one or more decorrelated components that have frequency-varying group phase response. The transfer function is formed from a set of sub-band functions, with each sub-band function being formed from a set of corresponding component transfer functions including direct component and one or more decorrelated components.