Term
| What is the hearing aid setting for saturation sound pressure level 90 (OSPL90)? |
|
Definition
|
|
Term
| What is the input stimuli for OSPL90? |
|
Definition
| 90 dB SPL pure-tone that goes from 125 to 8000 Hz |
|
|
Term
| What's measured in the OSPL90 curve? |
|
Definition
| Output of the hearing aid from 125-8000 Hz |
|
|
Term
| What's measured in the hight frequency average OSPL90? |
|
Definition
| Average output taken at 1000, 1600, and 2500 Hz from the OSPL90 curve |
|
|
Term
| What is the tolerance of the high frequency average OSPL90? |
|
Definition
| Needs to be +/- 4 dB of manufacturer's specifications |
|
|
Term
| What is measured for the max or peak OPSL90? |
|
Definition
| The highest point on the OSPL90 curve |
|
|
Term
| What is the tolerance of the max or peak OPSL90? |
|
Definition
| Needs to be within +/- 3 dB of manufacturer's specifications |
|
|
Term
| What is the hearing setting for full-on gain measures? |
|
Definition
|
|
Term
| What is the input stimuli for full on gain measures? |
|
Definition
| 50 dB SPL pure-tone that goes from 125-8000 Hz |
|
|
Term
| What's measured in the full on gain curve? |
|
Definition
| gain of the hearing aid from 125-8000 Hz |
|
|
Term
| What's measured for the high frequency average full on gain? |
|
Definition
| Average gain taken at 1000, 1600, and 2500 Hz from the full on gain curve |
|
|
Term
| Whats the tolerance of the high frequency average full on gain? |
|
Definition
| Needs to be within +/- 5 dB of manufacturer's specifications |
|
|
Term
| What is the hearing aid setting for reference test gain? |
|
Definition
| With the volume set at the high frequency average OSPL 90 minus 17 dB |
|
|
Term
| What is the input stimuli for reference test gain? |
|
Definition
| 60 dB SPL pure-tone that goes from 125 to 8000 Hz |
|
|
Term
| What's measured in the reference test gain? |
|
Definition
| It is the average gain of the HA taken at 1000, 1600, and 2500 Hz |
|
|
Term
| What is the tolerance of the reference test gain? |
|
Definition
|
|
Term
| What is the best coupler to run an electroacoustic analyses for in the ear hearing aids? |
|
Definition
|
|
Term
| A ___ ___ HA is an instrument whoee effective bandwidth lies substantially outside the usual amplification range; specifically where the full on gain at any of the HFA frequencies (1000, 1600, and 2500 Hz) is more than 15 dB lower the maximum full on gain at any frequency. Examples are high frequency or low frequency emphasis instruments |
|
Definition
|
|
Term
| What are the major components of the test box? |
|
Definition
| tone and/or noise generator, amplifier, loudspeaker, and the control mic |
|
|
Term
| The ___ ___ of the test box is placed next to the HA mic and monitors the SPL reaching the HA from the loudspeaker. If it is found to not be at a desired level, the tone is changed. |
|
Definition
|
|
Term
| During an electroacoustic analysis, which test is performed first? |
|
Definition
|
|
Term
| T/F: The test box uses fourier transform to determine output levels and frequencies coming out the hearing aid |
|
Definition
|
|
Term
| T/F: The test box is lined with spongy material to reduce reverberation or reflection |
|
Definition
|
|
Term
| T/F: the pressure method involves placing the control mic in the test position prior to the actual measurement |
|
Definition
|
|
Term
| T/F: An automatic gain control HA is an instrument where there is a direct and predictable output of the HA based on the input level and the gain. |
|
Definition
|
|
Term
| T/F: The tolerance fro total harmonic distortion have to be less than or equal to the published values plus 3% |
|
Definition
|
|
Term
| Know how to read a graph about output compression circuits |
|
Definition
|
|
Term
| ___: is a hearing aid where there is a direct and predictable output of the hearing aid based on the input level and the gain |
|
Definition
|
|
Term
___ ___ hearing aid: is an instrument whose effective bandwidth lies substantially outside the usual amplification range; specifically, where the full-on gain at any of the “HFA”
frequencies (1000, 1600, and 2500 Hz) is more than 15 dB lower than the maximum full-on gain at any frequency. Examples are high-frequency- or low-frequency-emphasis instruments |
|
Definition
|
|
