It was, arguably, an analog computer, in that it housed pencils, pens, a calculator, ruler, protractor and a folder for each of one's classes.

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As a test, I downloaded files from HDtracks.com, an online retailer specializing in hi-res audio, plugged a device known as a digital-to-analog converter (DAC) into my computer and listened over earphones.

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You can record from any stereo source with a stereo in-line jack and won't have to get any specialized software to put recordings back on your computer--all you need is an analog or digital source at bit rates up to 160 kbps.

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All three perform the same basic function -- they let you stream TV from your cable box (digital or analog), satellite receiver, or DVR to a computer or mobile device -- it's just that each is aimed at different segments of the market.

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Rather than discussing the already worn (and to me irrelevant) debate of digital book versus analog book, I talked about future technologies like brain computer interface, real-time simulation and programmable material, and how these will change the face of literature far beyond the Kindle, perhaps eventually eliminating text altogether.

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The headsets contain a sensor that detects various mental states, and a chip converts the signals from analog format to digital so they can travel wirelessly to a computer.

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Plus, with analog and optical connectivity, it's easy to get 3D sound from your computer, tablet, game console, mp3 player or any audio gear.

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