Binaural Audio Processor Flat Response Timbre Distortion
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Solution Overview
Problem
Binaural rendering technologies face challenges in efficiently processing audio signals in mobile devices with limited calculation and power resources, leading to degradation of sound quality due to timbre changes and reduced sound localization performance.
Innovation Solution
An audio signal processing device and method that generates an output audio signal by using a weighted sum of a first transfer function and a flat response, where the weight parameter is determined based on binaural effect strength, to maintain sound localization and timbre preservation, and the flat response is used to reduce timbre distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If binaural rendering is performed using a binaural transfer function such as HRTF, then sound localization performance is improved, but timbre changes occur causing degradation of sound quality
Solution Approach 1:
The patent changes the parameter of the transfer function by introducing a flat response component with constant magnitude in the frequency domain. This modifies the frequency characteristics of the binaural transfer function to reduce timbre distortion while preserving sound localization cues, directly resolving the contradiction between localization accuracy and sound quality
Solution Approach 2:
The patent creates a composite transfer function by combining the original HRTF with a flat response function. This composite approach integrates the localization benefits of HRTF with the timbre preservation benefits of flat response, achieving both sound localization performance and sound quality simultaneously
2Adaptability or versatility
If the number of channels or objects in audio signal increases, then immersive audio experience is improved, but calculation amount and power consumption increase
Solution Approach 1:
The patent simplifies the transfer function parameters by using flat response with constant magnitude, reducing the computational complexity of binaural rendering operations while maintaining the immersive audio experience through effective sound localization and timbre preservation
Data Source
AI summary
Disclosed is an audio signal processing device for rendering an input audio signal. The audio signal processing device includes a receiving unit configured to receive the input audio signal, a processor configured to generate an output audio signal by binaural rendering the input audio signal, and an output unit configured to output the output audio signal generated by the processor. The processor obtains a first transfer function based on a position of a virtual sound source corresponding to the input audio signal with respect to a listener, generates at least one flat response having a constant magnitude in a frequency domain, generates a second transfer function based on the first transfer function and the at least one flat response, and generates the output audio signal by binaural rendering the input audio signal based on the generated second transfer function.