DIGITAL Sound Processing 
With digital sound processing, 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 much more precise, and certain details can be changed without affecting the overall picture.
Being more robust than an analog signal, a digital signal can be repeated accurately and endlessly without affecting the overall quality. It's like making copies of a scanned image on a software diskette: each copy is a perfect duplicate of the original.
Hearing aids with digital technology contain a very advanced degree of signal processing that can provide better accuracy, sound quality, perception of loudness and environmental noise reduction. Digital hearing aids can have many separate amplifier channels. Most digital models are programmed using computers and can offer a high degree of flexibility and precision.
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