1 / 6

History of Hearing Aid

History of Hearing Aid. 한림대학교 자연과학대학 언어청각학부 이 경 원 Source from Danasound. History of Hearing Aids. In the beginning … 18th, 19th Century Ear Trumpets Amplified sound by 5 to 40dB Easy to fit Low maintenance Bulky and Visible. Vacuum Tube Amplifiers. Early 1900s through 1930s

joy
Download Presentation

History of Hearing Aid

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. History of Hearing Aid 한림대학교 자연과학대학 언어청각학부 이 경 원 Source from Danasound

  2. History of Hearing Aids • In the beginning… • 18th, 19th Century Ear Trumpets • Amplified sound by 5 to 40dB • Easy to fit • Low maintenance • Bulky and Visible

  3. Vacuum Tube Amplifiers • Early 1900s through 1930s • Vacuum Tube powered Body Aids • Bulky and expensive • Carbon Microphone • 2 Batteries required • True portableamplification

  4. Transistor Amplifiers & Miniaturization • Transistor Models - 1950s • Smaller, more portable • Lighter, fewer batteries

  5. Eyeglass Models • 1950s through 1960s • Continued miniaturization • Decreased visibility

  6. Micro-Miniature Hybrid Circuits • BTEs - Integrated Circuits - 1960s • ITEs - Miniature IC’s - 1970s • Analog Programmables - 1980s • CIC - Ultraminiature multi-chip Hybrid Circuits - 1990s • Digital Programmables - 1990s

More Related