Exam Preview for 35850: Fundamentals Still Matter: Compression in H

Fundamentals Still Matter: Compression in Hearing Aid Fittings

Please note: exam questions are subject to change.

1. Compression is most often used in modern hearing aids to: Help reduce audibility for very soft sounds Help focus microphones in forward direction Help reduce mid frequency noise Help adjust the amount of gain added to the incoming signal to better fit the wearer's hearing needs or dynamic range
2. Expansion is most often used in modern hearing aids to: Help reduce audibility for very soft sounds Help focus microphones in forward direction Help reduce mid frequency noise Help adjust the amount of gain added to the incoming signal to better fit the wearer's hearing needs or dynamic range
3. Which of the following sound quality issues is most likely to be caused by compression? Reverberant ossicular discontinuity Back microphones decrease high frequency sounds "Pumping" quality to the amplified signal Pain in the outer ear canal
4. What formula is used to derive the compression ratio? CR = Input level/output level CR = High frequencies/low frequencies CR= Hearing loss/distance CR = Maximum output/OSPL 90
5. In a hearing aid fitting, compression may be used to: Restore normal loudness perception Prevent over-amplification Maintain listening comfort All of the above