Projection Device Speaker Layout for Off-Center Sound Alignment
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Solution Overview
Problem
Small to medium scale projectors often experience sound imbalance due to installation positions deviating from the center line of the projection surface, leading to mismatched screen and sound images, particularly when installed at positions off-center or tilted.
Innovation Solution
The electronic device employs a first speaker outputting high-frequency sound toward the projection direction through a speaker cover with parallel holes of varying diameters, a second speaker outputting lower-frequency sound toward the back or side, and a processor controlling sound output to correct delays based on distance and projection angle, ensuring synchronized sound channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the projector is installed at a position deviated from the center line of the projection surface through the auto keystone function, then the screen can be adjusted to a rectangular shape and installation flexibility is improved, but sound bias occurs and left-right balance is deteriorated
Solution Approach 1:
The speaker system is divided into multiple independent speakers (first speaker, second speaker, third speaker) positioned at different locations within the projector body. Each speaker handles specific frequency ranges or sound channels, allowing independent control to compensate for off-center installation and maintain proper sound balance across the projection surface.
Solution Approach 2:
Different speakers are assigned different functions based on their positions and characteristics. The first speaker outputs high-frequency sound, the second speaker outputs low-frequency sound, and the third speaker outputs mid-frequency sound. This local differentiation of speaker functions allows for precise control of sound distribution to match the projected image position even when installed off-center.
2Adaptability or versatility
If the projector is installed at the ceiling or side surface to achieve versatile installation positions, then installation adaptability is improved, but sound image alignment with the screen is deteriorated
Solution Approach 1:
The system dynamically adjusts sound output based on installation position detection. The processor receives installation position information and automatically adjusts the timing and intensity of sound from each speaker to maintain proper sound image alignment with the projected screen, regardless of whether the projector is installed at the ceiling, side surface, or front position.
Solution Approach 2:
The system uses installation position detection feedback to adjust sound output. The processor receives feedback about the actual installation position and adjusts the timing and intensity of sound from each speaker accordingly, ensuring that the sound image remains properly aligned with the projected screen even when installed at non-traditional positions.
3Device complexity
If a single speaker is used to output sound from the projector main body, then device complexity is reduced, but sound balance and left-right alignment are deteriorated
Solution Approach 1:
The sound output system is segmented into multiple independent speakers (first speaker, second speaker, third speaker) instead of using a single speaker. Each speaker is responsible for specific frequency ranges or sound channels, which allows for precise control of sound distribution and maintains proper left-right balance even when the projector is installed off-center.
Solution Approach 2:
Each speaker in the system has a specialized function: the first speaker handles high-frequency sound, the second speaker handles low-frequency sound, and the third speaker handles mid-frequency sound. This local differentiation of functionality allows the system to maintain sound balance and alignment without requiring complex mechanical adjustments or additional processing.
Data Source
AI summary
An electronic device comprising a projection unit; a first speaker to output sound toward a front of the electronic device which is the projection direction of the projection unit, the first speaker including a speaker cover having a plurality of holes; a second speaker to output sound to at least one of a rear or a side of the electronic device; and at least one processor connected to the projection unit, the first speaker, and the second speaker to control the electronic device, wherein the processor may control the first speaker to output a first sound in a first frequency band, and control the second speaker to output a second sound in a second frequency band lower than the first frequency band.