For nearly as long as humanity has had ears, we’ve had hearing aids. Here we take a look at the various technologies our ancestors used to enhance their hearing – some low tech, some high tech, all ingenious.
1. The Animal Horn.
As early as the 13th century, hollowed out cattle horns were used as rudimentary ear trumpets. The device didn’t amplify sound like modern hearing aids, but funnelled it through a narrow tube into the ear.
2. The Personal Ear Trumpet.
By the early 1800s, the horn had evolved into the ear trumpet – an often bulky device with a fancy fluted end for speaking into.
3. The Portable Carbon Transmitter.
By 1890, the telephone had been invented and that meant new technology available to help people hear. This aid used a portable carbon transmitter to amplify sound signals but it wasn’t very effective.
4. The Vacuum Tube.
The refinement of vacuum tubes dramatically increased the amplification technology available – by as much as 70 decibels. By the mid-1920s, the unit could fit into a small wooden box, with a receiver the user held to their ear.
5. The Transistor System.
With the invention of the transistor in the 1950s, plus more efficient battery technology, hearing aids could become dramatically smaller and more practical – worn inside or behind the ear.
6. The Microprocessor.
By the 1970s, improvements in digital and analogue circuitry allowed the design of even smaller units incorporating powerful microprocessors.
7. The Dawn of Digital.
The first fully digital hearing aids emerged in the 1990s, with radically improved smart amplification technology able to process 40 million signals per second.
8. The Bluetooth Revolution.
By the new millennium, hearing aids had shrunk yet again, with receivers small enough to fit inside the ear canal itself – and even directly connect via Bluetooth to phones, TVs and computers.
9. The Smart Device.
Today’s hearing aids employ adaptive Artificial Intelligence to optimise sound quality in any hearing environment, even allowing for virtual check-ups with hearing care professionals.
For more information on how hearing aid technology could help you, please contact your local clinic.
NHC blog is our place to explore ideas and themes of interest. For professional audiology advice, please contact your local clinic for a consultation.