Handheld Loudspeaker Pair for Stereo Sound in Rotating Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hand-held electronic devices, such as mobile phones, face challenges in reproducing stereo sound effectively due to the requirement for minimum horizontal spacing between loudspeakers, which is difficult to maintain when the device is rotated from a portrait to a landscape position, leading to increased production costs and device size with existing solutions.
Innovation Solution
A single pair of loudspeakers is spaced in two directions perpendicular to each other, ensuring horizontal separation irrespective of the device's orientation, with a controller adjusting digital processing algorithms to compensate for spacing differences and swapping sound signals as necessary when the device is rotated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate loudspeakers are spaced horizontally to reproduce stereo sound, then stereo effect is improved, but device size and production cost increase
Solution Approach 1:
The loudspeakers are arranged in a vertical direction rather than horizontal, and the device can be rotated between portrait and landscape orientations. This dimensional change allows the loudspeakers to achieve horizontal spacing for stereo effect only when needed (landscape mode), while maintaining compact vertical arrangement when not in use (portrait mode), thus resolving the contradiction between stereo quality and device size.
Solution Approach 2:
The device incorporates rotatable orientation capability, allowing dynamic repositioning between portrait and landscape modes. This dynamic feature enables the loudspeaker arrangement to adapt its effective spacing based on orientation, providing stereo effect in landscape mode while maintaining compact form factor in portrait mode, thereby resolving the size-quality tradeoff.
2Reliability
If loudspeakers are spaced horizontally for stereo sound in portrait position, then stereo effect is achieved, but horizontal spacing is reduced to zero in landscape position
Solution Approach 1:
The loudspeakers are positioned vertically rather than horizontally, creating a configuration where rotation between portrait and landscape orientations transforms the vertical spacing into effective horizontal spacing in landscape mode. This dimensional transformation enables the system to maintain stereo capability across both orientations without compromising adaptability.
Solution Approach 2:
The single loudspeaker pair serves multiple functions: in portrait mode it provides general sound output with compact vertical arrangement, while in landscape mode it automatically provides stereo effect through the rotated horizontal spacing. This multi-functionality resolves the contradiction between stereo reproduction reliability and multi-orientation adaptability.
3Reliability
If two pairs of loudspeakers are provided for different orientations, then stereo sound is maintained in all positions, but production cost and device size increase
Solution Approach 1:
A single pair of loudspeakers is designed to serve both portrait and landscape orientations through the device's rotatable capability. The loudspeakers provide compact vertical arrangement in portrait mode and transformed horizontal spacing in landscape mode, eliminating the need for separate loudspeaker pairs for different orientations. This universal design significantly reduces production cost while maintaining stereo sound reliability in all orientations.
Solution Approach 2:
The function of multiple loudspeaker pairs (one for portrait, one for landscape) is merged into a single loudspeaker pair that adapts its effective configuration through device rotation. This merging eliminates redundant components, reducing production cost and complexity while achieving stereo sound in all orientations through the single adaptive loudspeaker arrangement.
4Reliability
If three loudspeakers in L-formation are used, then stereo sound is achieved in both orientations, but production cost and device size increase
Solution Approach 1:
A single pair of loudspeakers is designed to perform the function of multiple loudspeakers by utilizing device rotation. The vertical arrangement in portrait mode and the transformed horizontal arrangement in landscape mode allow one loudspeaker pair to achieve stereo effect in both orientations, reducing device complexity from three loudspeakers to just two, while maintaining stereo reproduction reliability.
Solution Approach 2:
The system uses dynamic rotation between orientations to change the effective spatial relationship of the loudspeakers. This dynamic repositioning allows a fixed vertical arrangement to become an effective horizontal arrangement, enabling stereo sound in landscape mode without adding physical loudspeakers, thereby reducing device complexity while maintaining audio quality.
Data Source
AI summary
A hand-held electronic device for producing stereo effect sound in both a first and a second orientation of the device. The first and second directions are perpendicular to each other. The device comprises a pair of loudspeakers spaced from each other in two directions perpendicular to each other. One direction always lies in a horizontal plane irrespective of whether the device is in its first or second orientation.