Image Display Speaker Array Ceiling Front Sound Interference
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Solution Overview
Problem
Existing image display apparatuses face challenges in reducing acoustic interference between sounds directed in a front direction and a ceiling direction, which affects the overall audio experience by causing unwanted sound reflections and interference.
Innovation Solution
The use of an image display apparatus with a first speaker unit for outputting sound in a front direction and a second speaker unit with an array of speakers for outputting sound in a ceiling direction, where the frequency band of the second sound is higher and narrower than the first sound, and the amplifier gain in the second speaker unit is greater, enhancing directivity and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If speakers are arranged to emit sound in both front direction and ceiling direction, then sound coverage is improved, but acoustic interference occurs between the two sound directions
Solution Approach 1:
The audio system is segmented into separate speaker units for different sound directions. The front speaker unit and ceiling speaker unit are independently controlled with separate amplifiers, allowing independent optimization of each direction's audio output without mutual interference.
Solution Approach 2:
Different frequency bands are assigned to different speaker units based on their directional characteristics. The ceiling speaker unit handles higher frequency bands while the front speaker unit handles lower frequency bands, creating local quality differentiation that reduces acoustic interference while maintaining comprehensive sound coverage.
2Measurement precision
If amplifier gain for ceiling-directed sound is increased to improve directivity, then sound directionality is improved, but acoustic interference with front-directed sound increases
Solution Approach 1:
The system changes the frequency band parameter assigned to each speaker unit. The ceiling speaker unit is assigned higher frequency bands which naturally provide better directivity, while the front speaker unit handles lower frequency bands. This parameter differentiation allows both units to operate effectively without acoustic interference.
Data Source
Figure 1
Figure 2~3
Figure 4a(a)~4a(c)
AI summary
An image display apparatus is disclosed. The image display apparatus includes a display, a first speaker unit to output a first sound in a front direction, and a second speaker unit to output a second sound in a ceiling direction. The second speaker unit includes an array speaker with a plurality of speakers.