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UW-Madison BME 300 - Project Design Specifications

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Project Design Specifications (PDS) Date: March 13, 2008 Title: Hearing aid using DSP provided by TI Nathan Werbeckes Team Leader [email protected] Joseph Yuen Communicator [email protected] Jack Ho BSAC [email protected] Kuya Takami BWIG [email protected] Function: A hearing device that will use DSP chips to allow for the shifting or compression of an audio frequency bandwidth in real-time, in order to allow the user to hear frequencies that they can no longer hear due to sensorineural hearing loss. Client requirements: Apply and use TI DSP chips in a medical instrument. Design requirements: Build a device that takes the input of the normal human hearing range (20-20,000Hz) and converts (shifts or compresses) the signal (via DSP chip) so that a person with impaired hearing can hear the entire scope of what a normal human can hear. This semester we will concentrate on building the platform (input and output circuitry) and learning to program the DSP chip. - Physical and Operational Characteristics 1. Performance requirements: The device should take input from at least the entire normal human speech range range (20-10,000 Hz) and output into the limited range of the individual wearing the device. The device needs to perform real-time calculations. 2. Safety: The device should not emit electrical discharge that may harm the the wearer. Method of attachment must not irratate skin. Should be FDA approved 3. Accuracy and Reliability: The sound should be true, with no loss of frequency and minimal noise interference. 4. Life in Service: With a replaceable battery, the device should have a service life of at least 10 years. 5. Shelf Life: Must have a shelf-life of at least 20 years when stored in original packaging. 6. Operating Environment: Will be worn on ear for most of the day, but may be taken off at night or other times when unneeded. 7. Ergonomics: The device should, in the end, comfortably fit into the ear and not be easily seen or cause discomfort through excessive weight or bad shape. 8. Size: Must be smaller than 6 cm x 6 cm x 3 cm.9. Weight: lightweight, not exceeding 50 g, as it needs to be worn on ear. 10. Materials: Outer casing must be fabricated with no materials that irritate or otherwise harm the human skin. Must be soft at contact points to prevent discomfort to the wearer. 11. Aesthetics, Appearance, and Finish: comfortably fit into ear, minimalistic or fashionable (bluetooth hands-free device). - Production Characteristics 1. Quantity: Working prototype. 2. Target Product Cost: under $200 - Miscellaneous 1. Standards and specifications: FDA approval for standard human use. 2. Customer: People od all ages who suffer from sensorineural hearing loss. 3. Patient-related concerns: Currently no patient-related concerns 4. Competition: Currently there are no frequency changing audio devices that specifically act as hearing aids. Current digital hearing aids have feedback reduction, noise reduction, and speech enchancement


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UW-Madison BME 300 - Project Design Specifications

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