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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: Re: burn is indeed "deeper" posted by Oscillatus on January 3, 2003 at 02:07:33:
A pit is not a 0 and a land is not a one or anything like that at all , the laser actually reads troughs and non troughs , not a zillion "pits" , the data on a Cd is also not contiguous , it is interleaved and has error correction as well , the depth of a trough CANNOT actualy vary much as the reciver of the laser works when the pit is a 1/4 of the wavelength of the laser deep as it then "disrupts" it , you cannot go willy nilly and make deeper troughs etc. You might define the start of a trough better by sort of "slowing" and burning at this point or increasing power at the start, its actually called power ramping (I use it on my cutting lasers - where it slows down on curves or changes the power to less when doing 90 degree corners as it slows down at these corners)
There are also other conversions involved and the end result is not a series of ones and zeros or digital "pulses" , rather an analog sine like wave at about 3mhz - so the notion of an On/OFF and no grey area type thing is actually not really accurate.
The way a laser reads has all to do with reflectivity , speed and tracking issues and how the laser interprets or if indeed it CAN interpret the troughs or "less reflective" areas.
Rodney Gold
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Follow Ups
- How the "pits" are read - Rodney Gold 05:33:53 01/03/03 (4)
- Re: How the "pits" are read - Oscillatus 15:18:49 01/03/03 (0)
- Re: How the "pits" are read - Mike McCall 08:50:57 01/03/03 (2)
- Re: How the "pits" are read - Rodney Gold 09:45:09 01/03/03 (1)
- Re: How the "pits" are read - Mike McCall 15:23:00 01/03/03 (0)
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