Monthly Schedule

(MODD, Period C)

M 10/1/012

No additional HW due.

 

T 10/2/012

No class.

 

W 10/3/012

HW due:

1. Convert each of the following power ratios to decibels. Write answer in each case using the “dB” notation for practice.

(a) 10,000 : 1
(b) 30,000 : 1
(c) 500,000 : 1
(d) 2,000,000 : 1

(e) 10,000,000,000 : 1
(f) 70 : 1
(g) 700,000,000,000,000 : 1

2. Convert each decibel reading to a power ratio.

(a) 15 dB

(b) 3 dB
(c) 63 dB
(d) 100 dB
(e) 85 dB
(f) –20 dB

 

Th 10/4/012

HW due:

1. Compute the S/N ratio for each of the following bit depths. Remember to give your answers using the proper units!

(a) 8 bits
(b) 16 bits
(c) 24 bits
(d) 32 bits

2. Which of the following is more important when capturing digital audio or video, and why?
(a) bit depth (i.e., number of bits per sample), leading to a high S/N ratio
(b) resolution (i.e., number of samples per second of music, or per frame of video)

 

F 10/5/012

No school (faculty professional day). Michael, see below for your assignment.

 

M 10/8/012

No school (Columbus Day).

 

T 10/9/012

No class. Michael, please come in during C period so that we can work one-on-one.

 

W 10/10/012

HW due (Michael only): Contact Mr. Hansen during the weekend to develop a plan for making up some of the older HW assignments.

HW due (everyone else): Enjoy the long weekend!

 

Th 10/11/012

HW due: Answer the following questions.

1. Compute the data requirement (bytes per second) for each of the following. Sampling rates are given in Hz, which means cycles per second.

(a) 16-bit digital audio, 1 channel, 16,000 Hz
(b) 24-bit digital audio, 2 channels, 44,000 Hz
(c) 8-bit digital audio, 1 channel, 8,192 Hz

2. A composite time-trial bicycle wheel (with no spokes) has no discernible feature when viewed from the side except for a single blip where the air filler valve is located. The wheel is spun at a frequency of 3 Hz (that means 3 rotations per second), and a video camera is set up on a tripod to record the motion of the wheel. What is the apparent speed of the wheel if the video camera uses . . .

(a) 1 frame per second
(b) 3 fps
(c) 4 fps
(d) 5 fps
(e) 6 fps
(f) more than 6 fps

Note: The abbreviation fps means “frames per second.” Draw pictures to illustrate what is happening.

 

F 10/12/012

HW due: Read from the bottom of p. 43 to the middle of p. 54; write #6, 8, 10, 19 on pp. 58-59.

 

M 10/15/012

HW due:

1. Read from the last paragraph of p. 107 to the bottom of p. 137. Some of this material has already been discussed in class and can be read quickly. However, pay close attention to the new material, especially the test patterns on pp. 127 and 133 and their associated explanations.

2. Write some reading notes on your HW paper, or if you prefer, questions you would like to ask that are related to the reading.

3. Write #4, 7-10 all on p. 124.

4. Write #5 on p. 142.

 

T 10/16/012

No class.

 

W 10/17/012

HW due: Read Example 3.2 (p. 141) and from p. 143 to the middle of p. 154; write (on p. 159) #2, 3, 4, 6, 9.

 

Th 10/18/012

HW due: Read the caption to Figure 3.37 (p. 157) and the text from the middle of p. 157 to p. 173. Reading notes are required, as always, but no other additional written work is due. Please use this as a chance to get fully caught up on yesterday’s written assignment.

 

F 10/19/2012

HW due: Because the headmaster’s announcement at lunch on Thursday 10/18 implied that the web server was down, many students may have assumed that they would be unable to reach this site tonight. If you are reading this message, you are surely aware that it is only the e-mail server that is down, not the web server. However, because of the possible confusion associated with the announcement, there will be no additional written HW due today. Please use the time to get caught up on previously assigned problems or, if you are already caught up, to sleep.

Note: We could have had homework due today, since nothing is wrong with the web server. You should always check here, regardless of any other announcements or rumors you may have heard. However, on this particular occasion, Mr. Hansen the Merciful made the decision to have a night with no additional HW.

 

M 10/22/012

HW due: Read pp. 187-211. There is a lot of material there, so you will probably need to read it twice. Reading notes are required, as always. A list of questions would be a good idea to include along with your notes to yourself.

 

T 10/23/012

No class.

 

W 10/24/012

HW due: Read pp. 213-220; write #3-10 all on p. 212.

 

Th 10/25/012

HW due: Read from bottom of p. 230 (“Noise Reduction”) to bottom of p. 244; write pp. 237-238 #3, 8, 11. The most important thing to think about is the diagram on p. 243. Try to work this through in your mind, and we will also go over it in class on Friday.

 

F 10/26/012

HW due: Work through the diagram on p. 243. Be sure you understand exactly how all the parts and data flows fit together, so that they make sense to you.

 

M 10/29/012

No school (Hurricane Sandy).

 

T 10/30/012

No class.

 

W 10/31/012

HW due:

1. Read pp. 258-265. Reading notes are required, as always.

2. Read p. 276 and glance at the table on p. 277.

3. The table on p. 277 would be much more useful if the binary ASCII codes in columns 3 and 6 were presented in hex instead. Make that your task: Write the values in hex (using the 0x prefix for the first one in each column). You can check your answers at www.asciitable.com.

4. There is a typo in the table on p. 277. Can you find it? Hint: It’s in the last entry on the page.

5. Read pp. 281-288 (up to the heading, “The Decibel Scale”). Note: Do not read the section entitled “The Decibel Scale,” since your textbook actually teaches you the dBV scale, not the dB scale. The units of SNR for quantization noise are dBV, not dB, and the formula (given at the bottom of p. 289, but don’t read that page) is to multiply the bit depth by 6.02. Actually, we multiply by 6 to keep things simple, and we must remember to give units as dBV, not dB.

6. Write #3, 5, 6, 7, 18-21 all on pp. 266-267.

7. Write #45, 46, and 52 on p. 280.

If you cannot finish all of these, then do as many as you can, and finish the rest by Thursday.

 

 

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Last updated: 06 Feb 2013