HW5_audio_coding

HW5_audio_coding - 8 9 10 11 12 13 14 15 16 Level(db 0 8 12...

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Polytechnic University, Dept. Electrical and Computer Engineering EE3414 Multimedia Communication System I Spring 2006, Yao Wang ___________________________________________________________________________________ Homework 5 (Audio Coding) Reading Assignment: Peter Noll, MPEG Digital Audio Coding Standards, Chapter in: IEEE Press/CRC Press "The Digital Signal Processing Handbook” (ed.: V.K. Madisetti and D. B. Williams). Copies provided. Written Assignment 1. When uniformly quantizing a signal, what is the improvement obtained by adding one more bit per sample? 2. What are the three auditory properties that determine the lowest level of a sound that can be heard? 3. Assume an audio signal is divided into 16 frequency bands with energy in different bands as follows --------------------------------------------------------------------------------------- Band 1 2 3 4 5 6 7
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Unformatted text preview: 8 9 10 11 12 13 14 15 16 Level (db) 0 8 12 10 6 2 20 60 14 20 15 2 3 5 3 1--------------------------------------------------------------------------------------Assume that if the level of the 8th band is 60dB, it gives a masking of 12 dB in the 7th band, 15dB in the 9th. How many bits you would need to code the 7 th band and 9 th band respectively? Suppose original signal is represented with 8 bits/sample/band. 4. What are the three principle steps in perceptual audio coding? Draw a block diagram showing these three components. 5. What are the differences between the three layers of MPEG1 audio in terms of the techniques used and the audio quality produced at the same bit rate? 6. What is MP3 audio? Suppose you are a sales person in an electronics store. Explain how does it work to a potential customer who is looking to buy a MP3 music player....
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