An automatic volume limiter system (AVLS) is an option that limits the maximum volume level and is enabled through software or hardware in stationary or

portable media player A portable media player (PMP) (also including the related digital audio player (DAP)) is a portable consumer electronics device capable of storing and playing digital media such as audio, images, and video files. The data is typically stored o ...

devices used with headphones such as the

Walkman Walkman, stylised as , is a brand of portable audio players manufactured and marketed by Japanese technology company Sony since 1979. The original Walkman was a portable cassette player and its popularity made "walkman" an unofficial term for ...

or Sony PSP. The aim of this feature is to stop the headphones drowning out all other noise, and to limit the noise from the headphones being heard by other people. It can also prevent listeners from damaging their hearing. This volume limit can be set by the manufacturer or customized by the user.

References

{{Sound-tech-stub Digital audio