hw1 - Department of Computer Science, The University of...

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CSIS0315 Multimedia Computing and Applications 2008-2009 Assignment 1: Psychoacoustics, MIDI and Compression factor Due: 2008-11-14[Fri] 1700 1 Psychoacoustics a. What is the loudness level of each of the following tones? a 400 Hz tone at 50 dB SIL a 1000 Hz tone at 20 dB SIL a 4000 Hz tone at 100 dB SIL a 10000 Hz tone at 40 dB SIL b. Which of the following tones will be masked if a x Hz tone at y dB SIL is played along with it? Answer in the following format. 400 Hz 1000 Hz 4000 Hz 10000 Hz x y 50 dB 20 dB 100 dB 40 dB Example: 100 90 Yes No No No 415 30 415 50 415 80 2 MIDI a. What are the note name and octave number (e.g., B2) of the highest and lowest notes that can be represented in MIDI? b. Suppose one plays the C major chord on a MIDI controller as follows: C3 is pressed with velocity of 64 E3 is pressed with velocity of 64 C3 is released G3 is pressed with velocity of 64 E3 is released G3 is released If running status is not used, dump the MIDI messages as a hex byte sequence. You can assume
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This note was uploaded on 02/16/2010 for the course CS 315 taught by Professor Chan during the Spring '09 term at HKU.

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hw1 - Department of Computer Science, The University of...

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