Hearing aids exam 2 Questions and Answers (100% Correct Answers) Already Graded A+

Biggest difference between digital and analog HA? [ Ans: ] Analog transducers: air to electromag Digital transducer: air to electro to digital to electro T/F there are true linear HAs [ Ans: ] Nope! Because then you wouldn't have a HA ceiling and it can cause further damage What is a non linear gain HA [ Ans: ] A hearing aid that will compress a to not over amplify a person Frequency response [ Ans: ] How much gain a HA will give at each frequency with the same input OSPL stands for.... [ Ans: ] Out put sound pressure level OSPL 90 relates to MPO by [ Ans: ] OSPL 90 is the input presented to show when a hearing aid will hit its ceiling (MPO) MPO is [ Ans: ] Max power output of the HA RECD is [ Ans: ] Real ear to coupler difference The difference between measuring in a persons ear as opposed to measuring with a coupler When would you use a coupler [ Ans: ] Typical for peds but can be used in any case were you cannot test a patient using real ear A con of a coupler or simulated real ear is [ Ans: ] It isn't a perfect match to your patients actual ear and may give you some differences T/F it does not matter the method of input to an HA (mic, FM system, etc) they all convert to electro [ Ans: ] True An analog amplifier is not..... but instead it.... [ Ans: ] A transducer, increases size of signal and shapes the input What is an output of a HA [ Ans: ] A receiver, aka a speaker that transducer the sound to acoustic to be processed by the persons ear canal What is the difference in amplifiers between an analog and digital HA [ Ans: ] Digital uses math to amplify the sound and IS a transducer What helps the diaphragm conduct electricity [ Ans: ] Metal coating on one side The .... has an electret acting located near the diaphragm [ Ans: ] Metal backplate The electret stores [ Ans: ] Static electrical charge between diaphragm and backplate How do sound waves enter? [ Ans: ] Through the inlet port and then travel to one side of the diagphram What causes the diaphragm to move up or down [ Ans: ] Pressure fluctuations within a wave Displacement of the diaphragm creates [ Ans: ] Oscillating voltage signals between diaphragm and back plate Small electrical signal is amplified before [ Ans: ] Being sent as an output of the microphone Directional mics have ....inlet port [ Ans: ] 2 separate What important features make directional mics possible [ Ans: ] External and internal time delays External time delay is due to [ Ans: ] Outside sounds getting to the ports Internal time delay is due to [ Ans: ] Rear port has an acoustic damper creating a loss pass filter With an Omni directional mic you will have sound [ Ans: ] Come through equally no matter the azimuth How do you calculate RECD [ Ans: ] SPL in average real ear minus SPL generated in 2-cc coupler RECD is highest where [ Ans: ] Higher the frequency Internal feedback in a hearing aid is due to [ Ans: ] Vibrations of the diaphragm What is the purpose of couplers and ear simulators standards [ Ans: ] You can do this anywhere at anytime and have identica