Yves-Bernard André: Kind of Blue

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<p><img class="story_image" src="http://www.stereophile.com/images/070713-YBA-600.jpg" /></p> <b>Jonathan Scull: </b>You say your <a href="http://www.stereophile.com/content/yba-cd-1-blue-laser-cd-player">YBA CD-1 Blue Laser</a> CD player makes use of Stochastic Resonance, Yves-Bernard?
<p>
<b>Yves-Bernard André: </b>Yes, it is quite interesting that in adding some noise to the signal, we can actually get more information back.
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<b>Scull: </b>How do you implement that in the CD 1?
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<b>André: </b>We have a main diode that reads the information in the normal fashion. And a blue-laser diode that is giving <i>atmosphere</i> of light to the other laser, if you like.
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<b>Scull: </b>The blue laser bathes the underside of the CD?
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<b>André: </b>Yes.
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<b>Scull: </b>Which adds a type of noise?
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<b>André: </b>Exactly. But you don't <i>hear</i> this noise when you listen...
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<b>Ariane Moran: </b>No...it's <i>optical</i> noise.
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<b>André: </b>It permits the recovery of some information whose energy was not sufficient...
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<b>Scull: </b>To drive a zero to a one or the other way around?
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<b>André: </b>Exactly. Let me explain it this way. You take a box of eggs and you "shake" it with a soundwave. But the energy is not totally sufficient that an egg moves from one hole to another. If you look, you have no signal, because the eggs are not moving. Then you add stochastic noise. The energy of this noise is sufficient to permit the egg to move from one hole to another. And at this time you don't see the noise, but you see the signal, which existed before.
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<b>Scull: </b>Leaving the chicken coop for the lab, how does that translate into the CD 1's operation?
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<b>André: </b>We decided that the LSB

[Source: http://www.stereophile.com/content/yves-bernard-andr233-kind-blue]
 
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