Dynamic Low-Frequency Sound Field Using Auxiliary Loudspeakers
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Solution Overview
Problem
Existing audio systems face challenges in generating a uniform low-frequency sound field due to standing waves in small environments, limiting the effective use of subwoofers and resulting in varying audio experiences for listeners based on their seating positions.
Innovation Solution
A computer-implemented method that dynamically adjusts parameters such as gain, delay, and filter settings for non-subwoofer loudspeakers to extend their frequency range, allowing them to function as auxiliary subwoofers, thereby increasing the number of effective loudspeakers capable of producing low frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If subwoofers are strategically placed to optimize low-frequency sound field, then low-frequency sound quality is improved, but the number of possible placement locations is limited due to large subwoofer size
Solution Approach 1:
The patent makes non-subwoofer loudspeakers perform the additional function of reproducing low-frequency sound. By extending the frequency range of existing loudspeakers to include low frequencies, the system gains more effective low-frequency sources without adding dedicated subwoofer placement points, thus resolving the contradiction between sound quality and placement versatility.
Solution Approach 2:
The patent changes the operational parameters of non-subwoofer loudspeakers by adjusting their frequency response characteristics. Through electronic parameter modification, these loudspeakers are enabled to reproduce low-frequency sound effectively, transforming them into functional subwoofers and increasing the number of effective low-frequency sources in the system.
2Manufacturing precision
If multiple subwoofers are used to improve low-frequency sound field, then sound field quality is improved, but device complexity and physical space requirements increase
Solution Approach 1:
Instead of adding multiple dedicated subwoofer devices, the patent enables existing loudspeakers to perform subwoofer functions. This multi-functional approach improves low-frequency sound field quality without increasing the physical number of subwoofer devices, thereby reducing device complexity and space requirements.
Solution Approach 2:
The patent merges the functions of loudspeakers and subwoofers into a single system. By combining low-frequency reproduction capability with existing loudspeaker units, the system achieves improved low-frequency sound field quality without the complexity and space overhead of separate subwoofer devices.
3Quantity of substance
If non-low-frequency loudspeakers are used to output low frequencies, then the number of effective loudspeakers is increased, but the loudspeaker may operate outside its optimal frequency range
Solution Approach 1:
The patent applies parameter changes to extend the frequency response of non-subwoofer loudspeakers into the low-frequency range. By modifying electronic parameters such as crossover frequencies and gain settings, the system enables these loudspeakers to reproduce low frequencies reliably without physical repositioning or additional hardware, thus increasing the number of effective loudspeakers while maintaining operational reliability.
Data Source
AI summary
Disclosed embodiments include techniques for generating a low-frequency sound field for an audio system. A computing device in the audio system determines that a first playback level of an audio input is less than a maximum playback level of the audio system. Based on the first playback level, the computing device retrieves one or more first parameters associated with a first loudspeaker included in the audio system, where the one or more first parameters decrease a first cutoff frequency of the first loudspeaker to a second cutoff frequency. The computing device modifies a first portion of an audio signal transmitted to the first loudspeaker to decrease the first cutoff frequency to the second cutoff frequency based on the one or more first parameters.