Frequency-Selective Sound Modification for Balanced Audio Energy
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Solution Overview
Problem
Conventional audio processing techniques for augmented reality often unintentionally alter the overall energy level of an audio signal, leading to an unnatural or unbalanced listening experience.
Innovation Solution
A method for sound modification that involves determining classifications for each sound in an audio signal, selecting specific frequency sub-bands based on these classifications, and modifying only those sub-bands to generate a modified audio signal without significantly altering the overall energy level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional approaches selectively increase or decrease the energy level of certain sounds, then the ability to emphasize or deemphasize certain sounds is improved, but the overall energy level of the audio signal is significantly altered, making the modified audio signal perceived as too loud or too soft
Solution Approach 1:
The patent applies local quality by modifying only specific frequency sub-bands of selected sounds rather than adjusting the overall energy level of the entire audio signal. This allows selective emphasis or deemphasis of particular sounds while preserving the natural balance of the complete audio mixture, thereby avoiding the problem of the entire signal becoming too loud or too soft.
2Ease of operation
If an inverse sound wave is generated to cancel a certain sound, then the ability to remove unwanted sounds is improved, but other sounds in the audio signal are unintentionally affected, including cancellation of all or part of other sounds
Solution Approach 1:
The patent applies local quality by targeting specific frequency sub-bands associated with the unwanted sound rather than applying broad-spectrum cancellation. This precise localization of the modification ensures that only the desired sound is affected while other sounds in the audio signal remain intact and unaffected.
Solution Approach 2:
The patent replaces the mechanical approach of generating inverse sound waves with a digital signal processing approach that operates in the frequency domain. By using Fourier transforms and selective frequency sub-band manipulation, the system achieves sound cancellation without the harmful side effects of time-domain inverse wave generation.
3Ease of operation
If the amplitude of a sound channel is increased to enhance a certain sound, then the ability to emphasize specific sounds is improved, but the overall energy level of the audio signal is significantly altered
Solution Approach 1:
The patent applies local quality by increasing the amplitude only in specific frequency sub-bands of the selected sound channel rather than across the entire frequency spectrum. This selective amplification enhances the desired sound while maintaining the overall energy balance of the complete audio signal.
Solution Approach 2:
The patent applies parameter changes by selectively modifying the amplitude parameter only for specific frequency sub-bands rather than changing the overall amplitude of the entire audio signal or sound channel. This targeted parameter modification allows sound enhancement without significant alterations to the total energy level.
Data Source
AI summary
In various embodiments, a sound modification application selectively modifies one or more sounds included in one or more audio signals. In operation, the sound modification application determines classifications associated with multiple sounds included in one or more audio signals. The sound modification application selects a first frequency sub-band of a first sound included in the multiple sounds based on a first classification associated with the first sound. The sound modification application then modifies the first frequency sub-band of the first sound, without modifying at least a second frequency sub-band of the first sound, to generate a modified audio signal.