HEAR 657 Term 3 Chapter 4

What does this symbol represent in a HA schematic?

• Microphone

• Amplifier

• Battery

• Receiver

Which statement(s) is/are true about omnidirectional microphones in HAs?

• They are electret condenser microphones (ECMs).

• They work on the principle of capacitance.

• They do not need a power supply.

• They pick up sounds equally from all directions.

Which statement(s) is/are true about directional microphones?

• They help the wearer tell the direction a sound is coming from.

• They improve the SNR of the signal.

• They have an internal filter.

• They were designed to help the wearer understand speech in noise.

Which of the following is/are advantages of BTEs?

• They are easy to insert and remove.

• You can remove the earmould.

• They can amplify any HL that's aidable.

• They are very comfortable.

Which is/are advantages of bilateral fittings compared to unilateral?

• You can eliminate the head shadow.

• You can have better sound localisation.

• You can squelch sounds you're not interested in.

• You can get binaural interference.

What are effective ways to overcome the occlusion effect in HAs?

• Reduce low Hz amplification.

• Reduce high Hz amplification.

• Increase vent size.

• Remake earshell/earmould so it's deeply seated.

What are effective ways to reduce acoustic feedback?

• Reduce low Hz amplification.

• Reduce high Hz amplification.

• Reduce the size of the vent.

• Use a feedback manager.

Which statement(s) is/are true about acoustic horns?

• You can have intentional and unintentional horns.

• They boost high Hz amplification.

• They reduce high Hz amplification.

• They occur when the diameter of the sound bore is not consistent.

Which statement(s) is/are advantages of Open Canal fittings?

• They reduce or eliminate acoustic feedback.

• They reduce or eliminate occlusion.

• They reduce or eliminate the effectiveness of directional microphones.

• They reduce or eliminate loudness discomfort.

Which of the following statement(s) is/are true about RITE HAs?

• They have a better sound quality than RITA HAs.

• They reduce acoustic feedback compared with RITA HAs.

• They provide more gain than RITA HAs.

• They function pretty much the same as RITA HAs.