dB SPL
Digital sound processing
Dynamic Feedback Cancellation

dB SPL
Decibel Sound Pressure Level expresses the sound pressure level relative to 20 micro Pascal (µPa). 20 µPa at 1 KHz is the weakest sound level a person with normal hearing can hear. Sound pressure at 20.000 µPa is equivalent to 60 dBSPL, which is where you hear normal speech.

Digital sound processing
Digital sound processing means that the sound is registered mathematically. It is encoded as a series of numbers that measure its pitch and volume at a given instant in time. Processing the sound bit by bit is very precise, and certain details can be changed without affecting the general picture.

Dynamic Feedback Cancellation
The Dynamic Feedback Cancellation system is a feature in Oticon's Adapto hearing aids. This system constantly monitors incoming sounds and cancels feedback before it is even heard.

The DFC system is designed to react to any situation the user may face – no matter how quickly or slowly alterations in the acoustic environment occur.