ps3_fall09

ps3_fall09 - Department of Electrical and Computer...

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Department of Electrical and Computer Engineering Digital Speech Processing Homework No. 3 Problem 1 Which of the following pairs of tones is perceived as the louder tone (and by how many phons): 1. 20 dB intensity level at 1000 Hz or 20 dB intensity level at 4000 Hz 2. 40 dB intensity level at 250 Hz or 40 dB intensity level at 1000 Hz 3. 50 dB intensity level at 500 Hz or 30 dB intensity level at 2000 Hz Problem 2 What is the perceived pitch (in Mels) for the following tones: 1. 50 Hz 2. 250 Hz 3. 500 Hz 4. 2000 Hz 5. 5000 Hz 1
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Problem 3 Figure 1: Periodic square wave input to ear. If the input to the ear is the periodic square wave, s ( t ), shown in Figure 1, with T = 10 msec period, what frequencies are present at the input to the basilar membrane (assuming all processing at the outer and middle ears is linear). Show the response of the basilar membrane to the periodic square wave at the stapes end and at the apical end. Problem 4
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ps3_fall09 - Department of Electrical and Computer...

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