Digital hearing aids

Dillier et al., 1993] Dillier, N, Frolich, T., Kompis, M., Bogli, H., and Lai, W. (1993). Digital signal processing (DSP) applications for multiband loudness correction digital hearing aids and cochlear implants. J. Rehab. Res. andDevel., 30 95-109. 

A third primary dry cell is the zinc-mercuric oxide cell depicted in Figure 17.7. It is commonly given the shape of a small button and is used in automatic cameras, hearing aids, digital calculators, and quartz-electric watches. This battery has an anode that is a mixture of mercury and zinc and a steel cathode in contact with solid mercury(II) oxide (HgO). The electrolyte is a 45% KOH solution that saturates an absorbent material. The anode half-reaction is the same as that in an alkaline dry cell,... 

The first hearing aids were analogue, a process that amplified sound without changing its properties. Although amplification was adjustable, the sound was not sorted, so background noise was also amplified. New hearing aids are digital, a process in which sound waves are converted into binary data that can be cleaned up to deliver clearer, sharper sounds. 

Cochlear Implants. The U.S. Food and Drug Administration approved cochlear implants in the mid-1980 s. A cochlear implant differs from a hearing aid in its structure and its function. It consists of a microphone that collects sound, a speech processor that sorts the incoming sound, a transmitter that relays the digital data, a receiver/stimulator that converts the sound into electrical impulses, and an electrode array that sends the impulses from the stimulator... 

Hearing aid manufacturers are on their fourth generation of products, and digital devices are becoming... 

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