White noise or sound masking: what’s the difference?

Introduction

The world of acoustics can often become an overwhelming and daunting realm. Not only the quality and quantity of products used within a space but also the positioning of said products is paramount for success. The placement of a sound masking system is not exempt from this rule. The system should be installed with the consideration of every light fixture, ceiling detail and surface area of each room.

Acoustics within office environments has always been, or at least should always be, an important factor for any employer and designer to consider. Numerous studies will account for the importance of acoustic management within open plan spaces. Various products are available to help with the reduction of noise pollution. Acoustic ceiling rafts, wall mounted panels and divider screens, provide both an aesthetic and functional purpose. The conversation of ‘white noise machines’ has also been ongoing for a number of years. Given the recent surge in popularity with ambient sound videos, in which users have been listening to the comforting sounds of rain forests and waterfalls while working from home, the introduction of ‘white noise machines’ seems to be the natural progression for returning to the office.

Common Misconceptions

White noise machines work by producing noise frequencies which the human ear hears in random order at the same amplitude. This results in a sound associated with old television or radio static. Although white noise is audible, the common belief is that introducing a white noise machine into an office environment will aid those who struggle to work in complete silence by masking inconvenient noises such as pen clicking or footsteps. In turn, it should also help to dull the sound of conversation within the space, making focused working easier. In theory, for anyone who has had to work in a collaborative environment while trying to read a report or has become conditioned to working from home in a controlled environment which suites them, the introduction of a white noise machine seems like a good investment.

Given the high costs associated with acoustic solutions, one can be forgiven for reaching for the nearest portable speaker to place in the corner of the room, in the hope that it will bring some solace from varying distractions. Upon further research, however, there appears to be a surprisingly significant difference between ‘white noise machines’ and a system called ‘sound masking’.

Sound masking machines differ in several ways from white noise machines. Sound masking is specifically engineered to overlap only with the frequencies of human speech, as opposed to all frequencies. While white noise machine users have reported an ‘irritating’ amplified sound, sound masking should be undetectable. Given that white noise machines are ‘localized’, in that you can locate where the noise is coming from, sound masking creates a more immersive experience, improving productivity without distractions. Out with open plan offices, sound masking systems are also imperative for hospitals, clinics and therapy rooms to protect patient privacy.

The ability to adjust the intensity of a sound masking system by altering two deployment options, a direct field and indirect field, allows for a unique environment to suite any requirements. Indirect field masking is achieved when the system is placed above the ceiling tile. Special consideration to the width of the coverage pattern must be taken when using a direct masking system, which is surface mounted onto the ceiling. This should avoid any ‘dead’ areas in which the sound comes in and out of focus as you move through the space.

Conclusion

It has never been more important that the mental and physical health and well being of users is our primary focus as we transition into ‘the new normal’, whatever that may bring. Designers have a fundamental role moving forward in addressing the growing concerns many face as we move back into open plan offices and collaborative spaces. Interior Designers are already equipped with the experience and knowledge to tackle ever-changing requirements and challenges. Delving into the world of acoustics is a start into what will undoubtedly be an exciting and intriguing time for those in the industry and those who rely on the design world to provide them with workplaces which allow them to work to their full potential securely and comfortably.

If you would like further advice on improving the acoustics in your workplace, please don’t hesitate to get in touch.