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For a given application, the ERLE depends on the step size , the lter length L, the signal-to-noise ratio, and the nature of signal in terms of power and spectral contents. A larger step size provides a faster initial convergence, but the nal ERLE is smaller due to the excess MSE and quantization errors. If the lter length is long enough to cover the length of echo tail, increasing L will further reduce the ERLE. The ERLE achieved by an echo canceler is limited by many practical factors. Detailed requirements of an adaptive echo canceler are de ned by ITU-T Recommendations G.165 and G.168, including the maximum residual echo level, the echo suppression effect on the hybrid, the convergence time, the initial setup time, and the degradation in a double-talk situation. The rst special-purpose chip for echo cancelation implements a single 128-tap adaptive echo canceler [5]. In the past, adaptive echo cancelers were implemented using customized devices in order to handle the heavy computation in real-time applications. Disadvantages of VLSI (very large scale integrated circuit) implementation are long development time, high development cost, and lack of exibility to meet application-speci c requirements and improvements such as the standard changed from G.165 to G.168. Therefore, recent activities in the design and implementation of adaptive echo cancelers for real-world applications are focus on programmable DSP processors.

Nothing interrupts your time on the computer more than a pop-up window demanding you stop what you re doing to download a le, update, virus de nition, or browser plug-in. Windows users see these computing roadblocks

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constantly, but Microsoft can t be blamed for all the interruptions Here s a quick list of interruption requests on my systems recently: Windows automatic update les (okay, I can blame Microsoft for this one) QuickTime browser plug-in update (from Apple for equal time) Mozilla plug-in update for Macromedia Flash Player Real Player update Norton virus de nition les Each interruption demands that you stop and download a le or les Sometimes, for example with a browser plug-in, it takes just a minute or two With Microsoft and other operating system les, it can take hours to download a weekly update package The same can happen if you download an update to your browser or one of your multimedia players I get more aggravated by the 3-minute interruption and download than the half-hour ones.

This section discusses two practical techniques in designing adaptive echo canceler: prewhitening and delay detection.

When you know it will be 30 minutes, you can start the download and go do something else You can take advantage of being forced from your seat at the computer by wandering around for a few minutes and grabbing a snack But when I m searching for something on the Web and one of those le download boxes appears and makes me slam to a stop, I curse and glare at the monitor until I can escape from the trap and go back to my search With broadband, however, the downloads arrive in a fraction of the time that they do with a dial-up connection What used to be a 3-minute distraction is now a 30-second annoyance Of course, when downloads, such as patches for your operating system estimate they will take 30 minutes to download over a dial-up line, the broadband user can laugh.

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As discussed in 7, convergence time of adaptive FIR lter with the LMS algorithm is proportional to spectral ratio max / min . Thus, an input signal with at spectrum such as white noise has faster convergence rate. Since speech signal is highly correlated with non at spectrum, the convergence speed is slow. The decorrelation (whitening) of input signal will improve the convergence speed. Figure 10.6 shows a typical prewhitening structure for input signals. The whitening lter FW (z) is used for both the far-end and near-end signals. This xed lter could be obtained using the reversed statistical or temporal averaged spectrum values. One example is the anti-tile lter used to lift up the high-frequency components since most speech signal s power is concentrated at the low-frequency region.

Table 1-1 lists le download times, and you can see that downloading a le that takes 30 minutes to dribble down a dial-up line takes 5 minutes over a broadband connection Vendors now like you to download a small (under 1MB) le that triggers an update download of the other 99MBs or whatever The rst time or two I got fooled by this it really steamed me I downloaded the 1MB le and installed that, only to see the newly installed application begin the real work of downloading for what seemed like 24 hours With broadband, I get up and start looking for a snack because the download and installation will probably take 15 20 minutes With dialup, my computer is hosed for the evening and I want to threaten the computer with a baseball bat.

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As more companies move toward constant updates for security and operating system patches, these interruptions will increase Vendors want users to get broadband service because it makes it easier on them and because they can keep stuf ng those large updates down the pipe to users..

d(n) y(n)

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