Locality Based Noise Masking for Open Office Privacy
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Solution Overview
Problem
Open office environments face significant challenges with noise-related issues, including excessive speech intelligibility, lack of speech privacy, and discomfort due to ambient noise, which affect productivity and worker satisfaction, and existing noise reduction methods like noise-absorbing materials and pink noise have limitations.
Innovation Solution
A noise masking system that uses location-specific audio and video files to create a soundscape, incorporating natural sounds and visuals, which are dynamically adjusted based on location, weather, and time to enhance psychological comfort and reduce speech intelligibility and increase privacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If pink noise is injected into the open office, then speech intelligibility is reduced and speech privacy is increased, but listeners complain that the constant sound becomes fatiguing over time
Solution Approach 1:
The system dynamically adjusts the soundscape based on ambient noise levels, time of day, and user preferences. Instead of playing constant pink noise, the system varies the audio content to match changing environmental conditions, reducing listener fatigue while maintaining speech privacy benefits
Solution Approach 2:
The system changes multiple parameters of the soundscape including volume levels, frequency content, and audio source selection based on ambient noise measurements and user feedback. This allows optimization of both speech intelligibility reduction and listener comfort under different operating conditions
2Object-affected harmful factors
If noise absorbing materials are used, then ambient noise levels are reduced, but speech intelligibility is unaffected or even increased
Solution Approach 1:
The system introduces a soundscape as an intermediary layer between the ambient noise and the users. This soundscape masks speech intelligibility through psychoacoustic principles rather than physically absorbing sound waves, thereby reducing speech privacy issues without creating overly quiet environments that enhance speech clarity
Solution Approach 2:
The system changes the acoustic parameters of the environment by adding controlled sound sources rather than merely absorbing sound. This approach modifies the overall acoustic field to mask speech while maintaining appropriate ambient noise levels for comfort
3Productivity
If office space is densified to increase productivity, then more workers can be accommodated, but acoustical problems such as speech noise and discomfort increase
Solution Approach 1:
The system serves multiple functions simultaneously: it masks speech for privacy, provides acoustic comfort for dense environments, and can be adapted to different locations and conditions. This multi-functionality allows it to address acoustical problems in high-density offices without requiring separate solutions for each issue
Solution Approach 2:
The system dynamically adjusts acoustic parameters such as volume, frequency content, and sound source selection based on the specific conditions of the dense office environment, allowing optimization of comfort levels even as occupancy increases
Data Source
AI summary
Methods and apparatuses for noise masking are described. In one example, a location data is received or identified at a noise masking system, the noise masking system including a plurality of selectable noise masking sound audio files and a plurality of selectable video files. A noise masking sound audio file is selected from the plurality of selectable noise masking sound audio files and a video file is selected from the plurality of selectable video files utilizing the location data. The noise masking sound audio file is output to a loudspeaker and the video file is output to a video display device.