Elevator Audio System with Phase Control for Uniform Sound
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Solution Overview
Problem
Conventional elevator audio systems fail to provide uniform sound distribution and stereoscopic sound field environments due to the absorption of sound by passengers and the use of monaural speakers, resulting in poor sound quality and discomfort during rides.
Innovation Solution
An audio system for elevators featuring two or more speaker cabinets arranged in a suspended ceiling with a sound field control device that performs phase control and reverberation time control to radiate sound waves effectively throughout the car, creating a stereoscopic sound field with improved sound quality using indirect sound radiation and multiple speaker units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one speaker is installed inside the car, then the device complexity is reduced, but the sound distribution uniformity deteriorates because sound is absorbed by passengers' bodies
Solution Approach 1:
The audio system divides the sound radiation function into multiple segments by installing multiple speakers (first speaker near the front door, second speaker near the rear door) instead of using a single speaker. This segmentation allows sound to be distributed from multiple locations, preventing absorption by passengers' bodies and achieving uniform sound distribution throughout the car.
2Manufacturing precision
If multiple speakers are installed vertically arranged, then the sound distribution uniformity is improved, but the device complexity and cost increase significantly
Solution Approach 1:
The system applies local quality by positioning speakers at specific locations (front and rear doors) that are most effective for sound distribution. Instead of uniformly distributing many speakers throughout the car, the invention strategically places speakers at key locations where they can radiate sound effectively across the entire passenger space, achieving uniform distribution with minimal speakers.
3Device complexity
If monaural speakers are used, then the device complexity is reduced, but the sound quality and stereoscopic sound field environment deteriorate
Solution Approach 1:
The system creates a stereoscopic sound field by asymmetrically positioning speakers at opposite ends of the car (front door and rear door areas). This asymmetric arrangement, combined with phase control, generates a three-dimensional sound field that provides spatial audio perception, transforming the monaural experience into a stereoscopic environment without requiring complex multi-channel speaker systems.
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
The system achieves uniform sound distribution and enhanced sound quality by controlling sound waves to reach all passengers, providing a comfortable and immersive audio experience in a confined space, making the elevator ride feel more spacious and enjoyable.
Implementation Method 1
a sound field control device configured to conduct a control as phase control and reverberation time control for the sound content
Implementation Method 2
reverberation time control for the sound content and thereby cause a sound wave based on the sound content to be radiated from the speaker cabinet
Implementation Method 3
a speaker unit arranged inside the casing and having a radiation surface that radiates the sound wave
Data Source
AI summary
An audio system for an elevator includes two or more speaker cabinets arranged inside a suspended ceiling fixed to a ceiling board of a car of the elevator, an input device to which sound content radiated to an inside of the car from each of the two or more speaker cabinets are input, and a sound field control device configured to conduct phase control and reverberation time control for the sound content and thereby cause a sound wave based on the sound content to be radiated from the speaker cabinet to the inside of the car. Each of the speaker cabinets includes a casing arranged inside the suspended ceiling, and a speaker unit arranged inside the casing and having a radiation surface that radiates the sound wave.