Digital hearing aids and analogue hearing aids are the two main categories of hearing aids. Modern hearing aids make use of new digital technology, and work very well. Modern digital hearing aids take the sound, convert it into bits, and make necessary changes before amplifying the signal so that you can hear it better. These digital hearing aids provide flexibility because they have programmable features that can be customized to your specific needs. You do not need to adjust the volume on them as it is done automatically. There are different types of volume adjustments that resolve distortion and amplification problems. Digital processors use filters to clean up the sound and thus provide the best quality sound available.