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6 Cards in this Set
- Front
- Back
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* What is amplification?
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- Starts with a sound, then it changes acoustical energy into electrical energy, borrows energy from a battery, represents the sounds in 1s and 0s (digitization), applies mathematical concepts, changes back into analog signal, boosts up signal by borrowing more energy from the battery, changes that to an acoustic signal and then delivers to the ear canal |
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* What is the basic process of amplification as described in your text? (and the guided notes)
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* Each step requires a hearing aid component. Can you name each?
- Amplification is when sound are taken that occur naturally in the real world, borrows energy from an outside source (battery), changes it into electrical current (microphone) and makes it a digital signal, digitally manipulates the signal (processing algorithms), boosts it up (amplifier), changes it back to an acoustic signal (receiver) and sends the sound back to the person’s ear canal. |
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* What is the definition of a transducer? What are the transducers used in a hearing aid?
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- A transducer is a technical term for any device that changes energy from one form to another. In terms of hearing aids, sound is changed from an acoustic signal to an electric one and back again to an acoustic signal. |
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* How does a battery work? What do current hearing aid batteries aids use to produce the electricity (chemicals)?
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- Batteries have three parts, an anode (-), a cathode (+), and the electrolyte. The cathode and anode (the positive and negative sides at either end of a traditional battery) are hooked up to an electrical circuit. The chemical reactions in the battery causes a build up of electrons at the anode. |
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* What is battery capacity? (hint: Fuel capacity in a car is measured in gallons)
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- Battery capacity is a measure of the charge stored by the battery and is determined by the by the mass of active material contained in a battery. - Same voltage for all batteries. |
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* If you were given the “drain” of a hearing aid and a battery capacity, could you tell me how long the battery will last? In hours? In 16-hour days?
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- Time (in hours) = Capacity (in mA hours) / drain (in mA) |
