In simple terms, all hearing aids operate the same way: they pick up noise, convert the sound into electrical impulses and then forward them to the ear. The way in which hearing aids process the signal depends on whether the device is analogue or digital.
When analogue hearing aids pick up noise, they reproduce and amplify the sound via a loudspeaker. Analogue hearing aids are unable to filter out or reduce noise.
Digital hearing aids convert noise into electronic information. They have the ability to reduce loud background noise and detect which major sounds should be amplified and transmitted. This is why digital hearing aids tend to deliver improved sound quality and enhanced speech comprehension.
Digital hearing aids can be adapted to individual needs and are typically smaller than analogue models.