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Method to Provide Electronic Ear Protection Disclosure Number: IPCOM000040411D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02

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Linton, RL Record, LJ [+details]


A method is described which protects the hearing of an individual while allowing normal sound levels to be heard. Earplugs or earphones that muffle loud noises to prevent hearing loss muffle not only the loud noises but also the softer ones, such as conversation. This problem can be solved by designing the earphones to pass all acoustic levels below a set value and limiting all those above that value. The equipment required consists of: 1. A microphone. 2. An amplifier circuit with the following properties: a. Unit gain for all signal magnitudes below a set value. b. Clipping to prevent the magnitude from exceeding the set value. 3. A speaker to transmit the sound to the user's ear. The clipping level is set by turning a knob.