Assistive Listening Devices (ALDs)—General Information
In one sense, all the early hearing aids were really assistive
listening devices.
However, assistive listening devices didn't really come into their
own until the 1950s when devices other than hearing aids began to be
manufactured to help hard of hearing people cope where hearing aids
didn't work well.
One of the early such assistive devices was the more widespread use
of the t-coil in 1950. Another was the strap-on telephone
amplifier. A unique one was a vacuum-tube amplified ear trumpet built
in 1948.
|
 |
Click picture for larger view |
|
|
|
Example of an Assistive Device
Click on the "Miscellaneous" button
(on the
left), then on "Assistive Listening Devices" to see the details of this
and
other assistive listening devices. |
| |
|
| |
|
(If a larger picture doesn't appear, you may have to
turn your pop-up blocker off)
|
|
|
