Directional Speaker Array Using Suppression Sound Outside Throw Angle
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Solution Overview
Problem
Speakers emit sound uniformly across all angles, leading to unintended sound levels outside the desired throw angle range.
Innovation Solution
A directional sound apparatus comprising a source speaker and a suppression speaker, with active noise cancellation using microphones and processors to emit sound within a specific throw angle and reduce sound outside this range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If speakers are designed to emit sound as loud as possible throughout their throw angle range, then sound intensity within the desired throw angle is improved, but sound levels outside the desired throw angle range increase unintentionally
Solution Approach 1:
The patent applies preliminary anti-action by using suppression speakers to generate anti-phase sound waves that cancel out unwanted sound before it propagates outside the desired throw angle range. The suppression speakers emit sound in opposite phase to the source speaker, creating destructive interference that prevents harmful sound leakage in directions outside the intended throw angle, while maintaining strong sound intensity within the desired range.
2Ease of manufacture
If conventional speakers emit sound uniformly across all angles, then ease of manufacture is maintained, but sound directionality control deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the sound emission function into multiple independent speakers (source speakers and suppression speakers) positioned at different locations and orientations. Each speaker can be manufactured using conventional simple designs, but their coordinated arrangement and controlled phase relationships enable precise directional sound control, thus maintaining ease of manufacture while achieving superior directionality.
Solution Approach 2:
The patent implements local quality by assigning different functional roles to different speakers in the array. Source speakers are optimized for sound production within the desired throw angle, while suppression speakers are positioned and configured specifically to cancel sound in unwanted directions. This localized functional differentiation enables precise directional control without requiring complex manufacturing of individual speaker units.
3Adaptability or versatility
If suppression speakers are added to achieve directional sound control, then sound directionality is improved, but device complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where microphones detect sound propagation and the system adjusts the suppression speaker output accordingly. This feedback loop enables the complex multi-speaker system to automatically optimize its performance, managing the device complexity through intelligent control algorithms that coordinate the source and suppression speakers to achieve precise directional sound emission.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively directs sound within a desired throw angle while minimizing sound outside this range, enhancing sound control and reducing noise interference.
Implementation Method 1
a suppression speaker for emitting a suppression sound
Data Source
AI summary
A directional speaker apparatus has a source speaker for emitting a source sound; and a suppression speaker for emitting a suppression sound. A method for directional sound emission includes emitting a source sound from a source speaker; and emitting a suppression sound from a suppression speaker.