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WKetel
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re: Buenos notches - the Filter Wizard vs. the vuvuzela
WKetel   7/22/2010 5:19:28 PM
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THe adaptive cancellation approach does sound like a much more effective, and probably much simpler to implement approach. Of course, it would require using two identical microphones, but that should not be very difficult. Back in the 1960's I did use an manually controlled cancellation system to reduce background noise a whole lot, probably about 40dB,m although I could not measure it at that time.

nickname goes here
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re: Buenos notches - the Filter Wizard vs. the vuvuzela
nickname goes here   7/19/2010 7:33:00 PM
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Why not take out all stadium noise with an adaptive noise canceller and then add back zuzu-free generic stadium roar when the real roar peaks or whenever you think it's appropriate, like a laugh track on a sitcom. Soccer fans won't mind. They're probably mostly that same sitcom demographic

old account Frank Eory
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re: Buenos notches - the Filter Wizard vs. the vuvuzela
old account Frank Eory   7/15/2010 7:59:05 PM
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Excellent article Kendall! I'm always delighted to see practical DSP problems and solutions presented in an easy to understand manner. You described a real-world problem involving an imperfectly known signal, followed by a methodical approach to solving it beginning with the simplest possible solution and then progressing to more complex solutions, subject to real-world implementation limitations of your chosen hardware platform. Since the signal of interest was audio, it was great that you discussed psychoacoustics and how your ultimate solution to the problem took advantage of that. This is the kind of article that can get young engineers interested in DSP and in a very non-intimidating manner. Thanks again for writing this.



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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