Microphone Array Beam Width Adjustment for Zoomed Monitoring
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Solution Overview
Problem
Existing monitoring systems face inefficiencies when changing the monitoring range due to improper formation of sound directivity by microphone array devices, leading to inadequate sound transmission from specific objects, even when video and sound signals are synchronized.
Innovation Solution
A directivity control apparatus and method that includes a beam forming unit and a magnification setting unit, allowing for the adjustment of sound beam size and direction based on image magnification changes, ensuring proper sound directivity towards designated objects within the monitoring range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the monitoring range is changed by zoom operation, then the ability to focus on specific objects is improved, but the sound directivity formation becomes improper and sound transmission from specific objects deteriorates
Solution Approach 1:
The beam width is dynamically adjusted according to the zoom magnification level. When zooming in on a specific object, the beam width is narrowed to maintain proper directivity formation. This dynamic adaptation ensures that sound directivity is properly formed regardless of the monitoring range, resolving the contradiction between focus ability and directivity reliability.
Solution Approach 2:
The system changes the beam width parameter in response to zoom operations. By adjusting this acoustic parameter to match the visual magnification level, the system maintains proper sound directivity formation while focusing on specific objects, thereby resolving the technical contradiction.
2Device complexity
If the beam width is kept constant during zoom operations, then the system complexity is reduced, but the monitoring task efficiency deteriorates due to improper sound directivity
Solution Approach 1:
Rather than maintaining constant beam width, the system dynamically adjusts beam width based on zoom magnification. This dynamic approach, while slightly increasing control complexity, dramatically improves monitoring efficiency by ensuring proper sound directivity formation during zoom operations, thus resolving the contradiction between simplicity and productivity.
3Ease of operation
If the sound beam size does not change with magnification, then the device operation is simplified, but the sound transmission from specific objects deteriorates
Solution Approach 1:
The system automatically changes the beam width parameter in response to magnification changes. This parameter adaptation maintains proper sound transmission reliability during zoom operations without requiring manual intervention, resolving the contradiction between operational simplicity and transmission reliability.
Data Source
AI summary
A directivity control apparatus controls a directivity of a sound collected by a sound collecting unit including a plurality of microphones. A beam forming unit forms a beam in a direction from the sound collecting unit toward a sound source corresponding to a position designated in an image on a display unit. A magnification setting unit sets a magnification for magnifying or demagnifying the image in the display according to an input. The beam forming unit also changes a size of the formed beam in accordance with the magnification set by the magnification setting unit.