U of U ECE 5960 - Vocoders (2 pages)

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Vocoders



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Vocoders

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School:
University of Utah
Course:
Ece 5960 - Elec. Forensics & Failure
Elec. Forensics & Failure Documents

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ECE 5325 Wireless Communications Vocoders quantization and compression Q1 Which of the following consonants are voiced B p t s z v f m p j ch sh th Go to http www spsc tugraz at courses scl download and download vocoder zip Extract it to a local directory and open index html Read the text in the left hand panel Q2 Which excitation method in Figure 4b right hand panel in the browser is used to produce a d tone generator or noise generator How is that excitation expressed in Figure 5 Read the instructions for using the vocoder simulation program in section 4 of the left hand panel Then do the following Load the pre recorded text He caught them at your house Click on Analyze Click on Synthesize Switch the view mode to the left most choice Q3 Do the original and synthesized images look identical Q4 Do they sound the same Click the Audio speaker button Q5 How would you rate the quality according to Table 8 2 in Rappaport Switch the view mode to the colored middle button Q6 What are the red bars Q7 What does it mean to see 2 4 parallel bars stacked above each other Q8 Did you expect to see this based on the model descriptions Q9 What does this tell you about which LPC vocoder approach is used from Section 8 7 in Rappaport Now do the following Switch to the right most view mode and do the following Click the pencil button at the far left of the synthesis panel Click the down arrow at the far right Click Synthesize Play the signal Q9 Why did the pitch bars disappear Q10 How does the speech differ with this setting What is the model doing to achieve this sound Q11 Is it still intelligible Now do the following Click the undo arrow at the far right 1 UNIVERSITY OF UTAH DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING 50 S Central Campus Dr Salt Lake City UT 84112 9206 Phone 801 581 6941 Fax 801 581 5281 www ece utah edu ECE 5325 Wireless Communications Select the up down arrow button Move the pitches to 200 Hz Click Synthesize Play the signal Q12 How does the speech differ



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