Individual Review Homework #4 for students PDF

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HW 4...

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Individual Review Homework # 4 (Units 5 and 6) Individual Review Homework #4: total points: 10 pts Please use your notes and slides for this activity. You should first provide your own answers to the homework (using your own words). After the homework submission deadline, you will be able to access the solution to the homework. Please use it to verify your answers. They are provided to help you learn the material and study for the exam. Note, the answer provided does not necessarily contain all the relevant information. There are a total of 9 homework and they will count for 15% of the final grade.

1) (0.5pts) Which sound is louder?

The second sound is louder. 2) (0.5pts) Which sound has a lower pitch?

The first sound has a lower pitch. 3) (1pts) Locate the following structures (place the numbers inside the boxes): 1. ear canal 2. pinnae 3. tympanic membrane / eardum 68 5

1

2 3

74

4. 5. 6. 7. 8.

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Individual Review Homework # 4 (Units 5 and 6) 4) (2 pts) Describe the Missing Fundamental effect: why do you still hear the same pitch when you remove the first harmonic? The listener hears the same pitch when they remove the first harmonic because our brain perceives the pitch of a tone by the fundamental frequency. We could still perceive the same pitch even if the first harmonic is removed. 5) (2 pts) Spectral segregation cues (related to Question 4). Explain how the brain uses spectral information to group different sound waves together? If two instruments are playing the same note (the produce sounds that have the same fundamental frequency), what allows you to know that one instrument is a piano and the other is a flute? Even with overlapping fundamental frequencies, our brain is able to identify different sounds and localize them using auditory scene analysis. If you are listening for a piano, using spectral segregation cues, you would be able to identify the flute because it wouldn’t sound like the frequency of the piano that you are expecting. 6) (2 pts) Spatial segregation cues. What cues can the brain use to determine that a sound is coming from your left? The brain can use the wave length, pitch and time to determine which side a sound is coming from. 7) (2 pts) Why and when do you hear an echo? You hear an echo when a sound wave hits a hard surface. The sound wave is then reflected, which make the sound repeat several times because the sound wave is bouncing....