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Multimedia Signals and Systems

Mrinal Kr. Mandal

Chapter 4

MULTIMEDIA DATA ACQUISITION - all with Video Answers

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Chapter Questions

Problem 1

Consider an audio signal with a single sinusoidal tone at $6 \mathrm{KHz}$. Sample the signal at a rate of 10000 samples/sec. Reconstruct the signal by passing it through an ideal lowpass filter with cut-off frequency of $5 \mathrm{KHz}$. Determine the frequency of the reconstructed audio signal.

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02:15

Problem 2

What is aliasing in digital audio? How can it be avoided?

Jennifer Stoner
Jennifer Stoner
Numerade Educator

Problem 3

You are recording an audio source that has a bandwidth of $5 \mathrm{KHz}$. The digitized audio should have an average SNR of at least $60 \mathrm{~dB}$. Assuming that there are two stereo channels, and no digital compression, what should be the minimum data rate in bits/sec.

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Problem 4

You are required to design anti-aliasing filters for i) telephony system, ii) FM radio, and iii) $\mathrm{CD}$ recording. The audio sampling rates are given in Table 4.6 . Determine typical frequency characteristic requirements of the filters for the three applications. Using MATLAB, calculate the transfer functions of the corresponding Butterworth and Chebyshev filters. Which filters will you choose, and why?

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01:01

Problem 5

What should be the typical Nyquist sampling frequencies for full bandwidth audio and image signals?

Amit Srivastava
Amit Srivastava
Numerade Educator
02:59

Problem 6

You want to design an image display monitor with an aspect ratio of $4: 3$ (i.e., width:height). A user is expected to observe the images at a distance of 4 times the monitor diagonal. What should be the minimum monitor resolution? Assume that the HVS sensitivity is circularly symmetric, and is negligible above 25 cycles/degree.

AA
Amy Alred
Numerade Educator

Problem 7

Generate a simple color map with 64 colors. To observe the different colors, create images with different combinations of $R\{=32,96,160,224\}, G\{=32,96,160,224\}$, and $B\{=32,96,160,224\}$ and save them in any standard image format such as tiff, and ppm. Display the colors and verify the additive color mixing property discussed in Chapter 3.

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