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Hearing aid types differ in their technology or circuitry. In the early days, hearing aid technology involved vacuum tubes and large, heavy batteries. Today, microchips, computerization, and digitized sound processing are used in hearing aid design.
Digital programmable hearing aids have all the features of analog programmable aids but use digitized sound processing (DSP) to convert sound waves into digital signals. A computer chip in the aid analyzes the signals to determine whether the sound is noise or speech. It then makes modifications to provide a clear, amplified, distortion-free signal.
Digital hearing aids are usually self-adjusting. The digital processing allows for more flexibility in programming the aid. In this way, the sound it transmits matches your specific pattern of hearing loss.
This digital technology is the most expensive, but it offers many advantages. Key benefits include:
Some aids can store several programs. As your listening environment changes, you can change the hearing aid settings. This is usually done by pushing a button on the hearing aid or by using a remote control to switch channels. The aid can be reprogrammed by the audiologist if your hearing or hearing needs change.
These aids are more expensive than conventional analog hearing aids. However, they generally have a longer life span and may provide better hearing for you in different listening situations.
Conventional Analog hearing aids are designed with a particular frequency response based on your audiogram. The audiologist tells the manufacturer what settings to install. Although there are some adjustments, the aid essentially amplifies all sounds (speech and noise) in the same way. This technology is the least expensive, and it can be appropriate for many different types of hearing loss.
Analog Programmable hearing aids have a microchip that allows the audiologist to program the aid for different listening environments. Example environments include quiet conversation in your home, noisy situations like a restaurant, or large areas like a theater. The programming settings depend on your individual hearing loss profile, speech understanding, and range of tolerance for louder sounds.