Digital and Analog Hearing Aid Technology

A hearing aid is an apparatus that is fitted either behind the ear or within the outer ear canal, to amplify sound. The electro-acoustic device helps to modulate sounds for the hearing-impaired. The designs have come a long way since the passive funnels that were previously used to direct sound energy into the ear canal. Today, the bone anchored and cochlear implants make it possible for the device to be completely out-of-view, while consistently amplifying sound via state-of-the-art circuitry.

Hearing Aid Technology:

Hearing aid technology now displays models of different sizes and different dimensions. There are aids that rest at the back of the outer ear and those that fit in the outer ear region or concha. The other design models include devices that are fitted within the ear canal, ultra fine open-fit devices, programmable and adjustable varieties, disposable hearing aids, bone-anchored variants and eyeglass aids. There are wireless hearing aids that incorporate FM listening systems, Bluetooth and wireless microphones that can eliminate background noise and be connected to a TV or stereo. Directional microphones are devised to regulate the signal-to-noise ratio and subsequently improve speech clarity. These hearing aids can be customized to accommodate directional and omni-directional microphones. Telecoils or T-coils are also used in hearing aids. This technology allows audio sources to be connected directly to the hearing aid. This direct audio input hearing aid is powered by induction coils placed in electromagnetic fields. The hearing aid technology compulsorily includes the use of a microphone, receiver, battery and some sort of electronic circuitry.

Analog Hearing Aids:

Analog or adjustable control hearing aids incorporate the use of an audio circuit fitted with electronic components. These analog components are pre-programmed according to the specifications emphasized by the otolaryngologist. The analog components are either adjusted with small external controls or via variants built into the design. The adjustable circuitry allows the wearer to adjust volume. Analog hearing aids are created along the paradigms of the patented design (2,017,358) earned by Samuel Gordon Taylor, in 1932. The audio circuit can be programmed with more than one adjustment. The electronic control circuitry within an analog hearing aid, can be connected to an external computer, temporarily. The device is activated by either pressing buttons on the device itself or on a remote control. The modern versions also enable automatic control circuitry operations.

Digital Hearing Aids:

Digital hearing aids are also referred to as audio or programmable hearing aids. In these devices, both the audio and additional control circuits, are completely digitized. The hearing aid is externally programmed on a computer connected to the device. This enables the design to exhibit processing characteristics that are totally customized. The digital circuitry makes it possible for additional features to be implemented when and as desired. Digital hearing aids are by far the most flexible designs in the market. They can be programmed with multiple adjustments that operate adaptively and automatically. These hearing devices reduce acoustic feedback and background noise automatically, while detecting and adjusting to different listening environments. They can be fitted to accommodate additional control components such as microphones that catch transpose frequencies. The digital circuitry enables wireless transmission to preserve the spatial hearing ability of the hearing-impaired, while being modified for use within circuitry of mobile telephones, Internet connectivity and personal music players.