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What is this symbol?
[image] |
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Definition
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| IN the lab, the function of the output transformer was to.... |
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Definition
| match the output of the circuit to the speaker |
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Term
Harmonic Distortion:
-It results when extra energy is present at the ___ of a hearing aid at whole number multiples of the ___ ___ of the input of the hearing aid
-It is often a byproduct of ___-___
-It ___ the quality of speech and other signals
-It ___ speech intelligibility |
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Definition
| output; fundamental frequency; peak-clipping; degrades; decreases |
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| Patients start to complain when the peaks are about ___ dB higher than the smooth part of the curve |
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| ___ ___ are accessible by patients who have hearing aids that just have telecoil accessibility as a receiver |
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| The _________ mode of command transmission sends the control signals by creating a magnetic field at a frequency above the audible range |
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Label the following diagram: [image]
Word bank: Electret, diaphragm, inlet port, backplate, air path |
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Definition
| From top left to bottom right: inlet port, diaphragm, air path, backplate, electret |
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| ____ ___ is the time it takes from signal input to output which can be delayed by processing time which, if too long may degrade the signal (trade-off). |
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| ___ ___ filters provide more gain to low-frequency sounds than to high-frequency sounds, which give the sound a muffled or boomy quality. |
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| What are some disadvantages of modular hearing aids? |
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Definition
| some ears don't fit the standard size, too much feedback, and may fall out of the ear |
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| T/F: The reverberation time for an anechoic chamber is 0 seconds |
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___ ___ is the number of times per second the signal is sampled (needs to be ___ as high as the highest frequency
component of the signal) |
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| T/F: The hearing aid test box has a sound level meter as one of its main components |
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| T/F: The quality of an infrared signal can be degraded by sunlight |
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| T/F: Regarding connectivity for hearing aids, Bluetooth provides more mobility that direct-audio input |
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| T/F: The terms "band" and "channel" are often used synonymously |
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| T/F: The most sound-field amplification systems can increase the signal to noise ratio is about 10-15 dB |
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| T/F: In an anechoic chamber, if speech is 76 dB SPL at 1 m, it will be 64 dB at 4 m. |
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| T/F: Today's home fire alarm systems would wake most elderly adults with HL |
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| T/F: FM transmitters can send a signal to an endless amount receivers |
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| T/F: FM transmitters have to on the same frequency to "talk" to particular receivers |
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| T/F: Size 13 batteries are also identified by the color orange |
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| T/F: The critical distance of most anechoic chambers is 2 meters |
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| T/F: Air has to percolate the battery such that the plus side of the battery should be exposed to the air before it will work and some say users should wait one minute before putting the battery into the hearing aid |
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