Audio Spatialization Filtering for Click-Free Gain Changes
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Solution Overview
Problem
Existing audio signal processing systems in virtual reality and mixed reality environments often produce undesirable sonic artifacts, such as 'clicking' sounds, due to rapid changes in audio signals, which compromise the immersive experience and are computationally expensive, especially for mobile devices.
Innovation Solution
The implementation of pre-emphasis and de-emphasis filters in audio spatialization systems to attenuate low and high frequency components respectively, allowing for instantaneous adjustment of audio signals without causing sonic artifacts, by processing the audio signals through a series of filters before presentation to the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If audio signals are rapidly adjusted to reflect changing object positions and orientations, then the soundscape accuracy is improved, but sonic artifacts such as clicking sounds are generated
Solution Approach 1:
The pre-emphasis filter is applied to the input audio signal before spatialization processing to pre-condition the signal by attenuating low frequency components. This preliminary action prepares the signal to withstand rapid gain adjustments without producing sonic artifacts, allowing accurate soundscape rendering while preventing clicking sounds.
Solution Approach 2:
The de-emphasis filter acts as an intermediary between the spatialization processing and the output audio signal. It attenuates high frequency components of the processed signal, thereby mediating the transition and preventing the generation of sonic artifacts while maintaining soundscape accuracy.
2Reliability
If techniques are applied to reduce sonic artifacts, then the immersiveness is improved, but computational cost increases
Solution Approach 1:
The system changes the frequency domain parameters of the audio signal by applying pre-emphasis and de-emphasis filters. The pre-emphasis filter attenuates low frequency components and the de-emphasis filter attenuates high frequency components, thereby reducing sonic artifacts and improving immersiveness through parameter transformation rather than computationally intensive processing.
Data Source
AI summary
Examples of the disclosure describe systems and methods for presenting an audio signal to a user of a wearable head device. According to an example method, a first input audio signal is received. The first input audio signal is processed to generate a first output audio signal. The first output audio signal is presented via one or more speakers associated with the wearable head device. Processing the first input audio signal comprises applying a pre-emphasis filter to the first input audio signal; adjusting a gain of the first input audio signal; and applying a de-emphasis filter to the first audio signal. Applying the pre-emphasis filter to the first input audio signal comprises attenuating a low frequency component of the first input audio signal. Applying the de-emphasis filter to the first input audio signal comprises attenuating a high frequency component of the first input audio signal.