Speaker Array Audio Beam Deflection via Phase Control
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Solution Overview
Problem
Conventional area reproduction systems are limited by the length of the speaker array in the longitudinal direction, restricting the audio beam's radiable range.
Innovation Solution
An area reproduction system with a speaker array and a processing unit that adjusts the phase of the reproduction sound to deflect the audio beam by a specified angle, allowing it to be radiated beyond the speaker array's length, using a control line with a reproduction line that strengthens sound waves and a non-reproduction line that weakens them, and a directional angle control unit to achieve this.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a speaker array is used for area reproduction, then sound can be presented to specified positions with different contents and volumes, but the audio beam radiable range is limited by the length of the speaker array in the longitudinal direction
Solution Approach 1:
The patent introduces a control line positioned at a distance from the speaker array, parallel to it, creating a new spatial dimension for beam control. By setting the control line at a predetermined distance rather than using only the speaker array's longitudinal extent, the system expands the audio beam's radiable range beyond the physical limits of the speaker array length.
2Area of stationary object
If the speaker array length is increased to expand audio beam range, then the radiable range improves, but the device complexity and size increase
Solution Approach 1:
The control line acts as an intermediary element that mediates between the speaker array and the target reproduction area. Instead of directly extending the speaker array to cover larger areas, the control line positioned at a distance enables beam control and expansion without requiring additional speakers or increasing the array's physical dimensions.
3Area of stationary object
If phase adjustment is applied to deflect audio beam, then the radiating direction can be extended beyond speaker array, but the control complexity increases
Solution Approach 1:
The system controls audio beam direction and coverage by adjusting the phase parameter of the reproduction sound signal. By changing the phase of signals sent to individual speakers in the array, the system can deflect the audio beam to different angles and extend coverage beyond the speaker array's physical boundaries without adding complex mechanical structures.
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
Enables the audio beam to be radiated to areas not directly opposed to the speaker array, thereby expanding its radiable range and preventing limitations imposed by the speaker array's length.
Implementation Method 1
processing for processing a reproduction sound to be output from each of the plurality of speakers, based on a control line including a reproduction line that strengthens a sound wave radiated from the speaker array and a non-reproduction line that weakens the sound wave
Implementation Method 2
a directional angle control unit that executes a directional angle control process for adjusting a phase of the reproduction sound so that a radiating direction of the audio beam is deflected by a specified angle
Data Source
AI summary
Provided is an area reproduction system including a reproduction unit including a speaker array, a processing unit that processes a reproduction sound to be output from each of a plurality of speakers included the speaker array, based on a control line including a reproduction line that strengthens a sound wave radiated from the speaker array and a non-reproduction line that weakens the sound wave, so that an audio beam of a predetermined sound pressure or more is radiated only to the reproduction line, the control line being substantially parallel with the speaker array and being set in a position separated from the speaker array, and a directional angle control unit that adjusts a phase of the reproduction sound so that a radiating direction of the audio beam is deflected by a specified angle, in which each of the plurality of speakers outputs the processed and adjusted reproduction sound.