February 2007
Intermediate to advanced
464 pages
14h 40m
English
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COMPUTER EXERCISES
Use the speech file ‘Ch2speech.wav’ from the Book Website for all the computer exercises in this chapter.
2.24. Consider the 2-band QMF bank shown in Figure 2.35. In this figure, x(n) denotes speech frames of 256 samples and 
denotes the synthesized speech frames.
- Design the transfer functions, F0(z) and F1(z), such that aliasing is cancelled. Also calculate the overall delay of the QMF bank.
- Select an arbitrary voiced speech frame from Ch2speech.wav. Give time-domain and frequency-domain plots of xd0(n) and xd1(n) for that particular frame. Comment on the frequency-domain plots with regard to low-pass/high-pass band-splitting.
Figure 2.35. A two-band QMF bank.
Figure 2.36. Speech synthesis from a select number (subset) of FFT components.
Table 2.2. Signal-to-noise ratio (SNR) and MOS values.
- Repeat step (b) for x1(n) and xd1(n) in order to compare the signals before and after the downsampling stage.
- Calculate the SNR between the input speech record, x(n), and the synthesized speech record, . Use the following equation to compute the SNR,
Listen to the synthesized ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.