This week on 99% Invisible, we explore the hidden design decisions behind the sounds you hear every day — from the chime of your microwave to the startup sound of your computer.
The birth of sonic branding
In the early days of consumer electronics, devices made sounds purely as byproducts of their mechanical operation. The click of a switch, the hum of a CRT monitor, the whir of a hard drive. But as technology became digital and silent, designers faced a new challenge: how do you provide feedback to users when there are no moving parts?
The answer was to design sounds intentionally. What began as simple beeps evolved into an entire discipline of interaction design. Today, companies spend millions crafting the audio identity of their products.
The psychology of notification sounds
There's a reason your phone's notification sound is so hard to ignore. Audio designers exploit a psychological principle called the "orienting response" — our innate tendency to direct attention toward new or unexpected sounds. The most effective notification sounds combine a sharp attack (to grab attention) with a pleasant timbre (to avoid annoyance).
"The perfect notification sound is one that you always notice but never resent," explains one sound designer who has worked with multiple major tech companies. "That's an incredibly difficult balance to strike."