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CSD9518 > 10_Coupling to the ear/Venting > Flashcards

10_Coupling to the ear/Venting Flashcards

1
Q

If there was something unusual going on in the high frequencies (e.g. 3000 - 10,000 Hz), what would you suspect: venting, damping, or horn effects?

A

Horn Effects

**These are the frequencies responsible for the “brilliance” of a sound

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2
Q

What frequency range is responsible for the “presence” of a sound?

A

Mid-range (roughy 1000-3000 Hz)

**Also where we see damping effects

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3
Q

What frequency range would we expect to show effects from venting?

A

Lows: 20-~1000 Hz (Body)

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4
Q

What are the 2 ways to get a good high frequency response (hint: type or style of HA)?

A

Horn tubing or RIC

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5
Q

Name 3 coupling options (e.g. Earmold styles)

A
  • special
  • skeleton
  • full shell
  • half-skeleton
  • 1/4 skeleton (canal lock)
  • half-shell
  • canal
  • RITE earmolds
  • SpiralFlex (thin tube) earmolds
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6
Q

Can a custom earmold be “open”?

A

Yes, but have to be ordered that way

  • free-field or IROS molds (just a retention bar and the rest open with a little tubing)
  • tube fitting
  • mold with large vent
  • fitting tip with multiple large vents
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7
Q

Is earmold tubing the only tube?

A

No

  • BTE earhooks
  • tiny tubing inside the ITE/ITC/CIC that leads the sound out of the device from the receiver
  • slimtubes
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8
Q

What style of hearing aid has the least tubing?

A

RIC, but custom instruments are a very close second
**Hint: can try blocking the end of a custom instrument. If feedback still present, there could be a crack inside the instrument

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9
Q

Which type of earmold tubing is most common?

A

13

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10
Q

Which type of tubing helps control feedback?

A

Hard-walled

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11
Q

Which type of tubing is used with infants?

A

Sometimes 13 tubing, then step down to 16 to fit in baby’s ear (causes roll-off in high frequencies)

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12
Q

Describe the key difference between the effects of belled vs step-bore tubing

A

Stepped horns will have a shorter effective length than smooth bores b/c the change in diameter occurs closer to the medial tip
- stepped horns provide required boost in high frequencies very well, but originally, the glued tubing would come apart

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13
Q

The shorter the effective horn length, the ___ the cutoff frequency

A

Higher

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14
Q

What does addition of a damper do to the frequency response of a hearing aid?

A

Addition of a damper, either at the nub or tip, will decrease the primary resonance, and smooth out the others also

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15
Q

What 3 things is the resulting SPL at the TM made up of?

A

Amplified sound
Direct sound
Bone-conducted sound

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16
Q

As vent diameter increases, real-ear low frequency output ____, and the frequency at which vent-associated resonance occurs _____

A

Decreases; increases

17
Q

What is SelectAVent?

A

When a large vent is drilled and fitted with a tube or valve to alter the size of it to account for changes in ear geometry, or effects of slit leak venting that are not known beforehand

18
Q

The bigger the vent, the _____ (narrower/broader) the frequency range over which the vent will act

A

broader

19
Q

A pressure vent is

A

500

20
Q

Open vents extend just above 1000 Hz and have a _____ (smaller/larger) effect in dB than pressure vents

A

larger

21
Q

Name some of the outgoing acoustic paths that can cause feedback

A
  • Vent paths (intentional and unintentional)
  • cracks in tubing (external or internal)
  • soft tissue radiation
  • hard material radiation
22
Q

What are the 2 forms of occlusion?

A
  • the “occlusion effect”: the increase in BC sond in the occluded vs unoccluded ear
  • the “real ear occluded response” (REOR): the dB amount of attenuation provided by an object placed in the ear (can test by placing HA in ear, turning it off, and measuring REOR compared to REUR)
23
Q

Can you measure venting in the test box?

A

No - need on ear verification.

- if client has normal hearing at lower frequencies, can be under targets

CSD9518 (13 decks)

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