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Peter Lo
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re: My MP3 player won't shut up
Peter Lo   3/26/2013 11:39:39 PM
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Daisy, Daisy / Give me your answer, do. / I'm half crazy / all for the love of you

DrQuine
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re: My MP3 player won't shut up
DrQuine   3/26/2013 10:32:46 PM
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There was a time when CTL-ALT-DEL carried some authority on a PC and could be used to force a shutdown. Now I find it is usually completely ignored. On the devices which lock-up and won't shutdown (or restart), I guess we've all had the experience of having to remove the battery to turn them off. For devices without removable batteries, we just have to sit the device down until it runs itself dead.

y_sasaki
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re: My MP3 player won't shut up
y_sasaki   3/26/2013 6:17:07 PM
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When Apple released first iPod touch, they eliminated almost all mechanical switches. It even didn't have volume up/down button. Great, until you carry the iPod and get into subway station. Every time you get on and off the train, you have to bring up iPod from your pocket, unlock the screen, open control panel and change the volume "by touch". It was terrible design mistake. Fortunately Apple was not a fool - they added mechanical volume buttons on subsequent iPod Touch and iPhone. But I still don't like iPhone's "unlock by slide" feature. I wonder whey they didn't put a nice, mechanical, positive-feeling, one-hand-operational unlock switch, just like not-so-frequently-used "silent mode" switch.

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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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