Acoustic Grille Angle-Selective Reflection for Transducer Interference
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Solution Overview
Problem
Audio playback devices with multiple acoustic transducers often experience interference patterns due to the structure of the enclosure and proximity of transducers, leading to issues like distortion, feedback, and phase shifting, which affect the acoustical output and sound wave interference.
Innovation Solution
The use of a variable-acoustic-opacity acoustic grille that allows higher angle incidence wave components to pass through while blocking or reflecting lower angle components, optimizing the acoustical output and reducing interference between transducers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple acoustic transducers are positioned adjacent to each other in a compact enclosure, then the device size is reduced and transducer integration is improved, but sound wave interference patterns increase causing distortion and phase shifting
Solution Approach 1:
An acoustic grille is introduced as an intermediary element positioned between adjacent acoustic transducers. The grille selectively allows certain sound wave components to pass through while blocking or reflecting other components, thereby mediating the interaction between transducers and reducing interference patterns that cause distortion and phase shifting.
Solution Approach 2:
The acoustic grille implements local quality by having different acoustic properties in different regions or for different wave components. It selectively transmits certain frequency ranges or directional components while attenuating others, creating localized acoustic optimization in specific areas between transducers without affecting the entire device uniformly.
2Object-generated harmful factors
If the acoustic grille blocks lower angle incidence wave components, then interference between transducers is reduced, but some desired sound components may be attenuated
Solution Approach 1:
The acoustic grille utilizes parameter changes by varying its acoustic properties (such as opening size, material density, or geometric configuration) to selectively differentially transmit sound wave components. This allows optimization of the transmission characteristics to block harmful interference angles while preserving desired sound components across different frequency ranges.
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
This solution effectively minimizes interference between transducers, enhancing sound quality by allowing only desired wave components to pass through, thereby improving the acoustical output and reducing distortion and feedback.
Implementation Method 1
an acoustic grille to reflect sound waves received at a first angle of incidence and pass through sound waves that are received at a second angle of incidence
Data Source
AI summary
Apparatus and methods are disclosed for acoustic optimization. An example playback device includes a first transducer to at least one of output sound waves and receive sound waves, a second transducer to at least one of output sound waves and receive sound waves, and an acoustic grille positioned in relation to the first transducer, where the acoustic grille is to reflect sound waves received at a first angle of incidence.