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Quote (Yamahaluver @ Mar. 15 2003,21:39)</td></tr><tr><td id="QUOTE">I thought the process is known as annealing or burning, one cant expect a laser beam to physicaly stamp a CD like a die cast machine...............or is it possible now.
Hi Yamahaluver,
Most CD's are stamped, not burned. See:
CD-R VS CD Stamping
Take a look at this
link too. Near the bottom of the page you'll find the following statement:
"Thus not the pits or lands itself but the pit edges are responsible for data information."
It is the location of the transition between a pit and a land, or a land and a pit, that is responsible for the information, not the pits and/or lands themselves. If the pits are made longer during the recording process, one of two things will likely happen. Either the change will be too small to make any difference, or it will be long enough to cause the data to be read incorrectly. If it isn't clear why this is the case, after reading the information in the link above, I'll try to track down another Web page that will explain it a little more thoroughly.
"On
this page we find the following information:
"A transition between pit and land (either pit to land or land to pit) is a one, and everything else is a zero. Since the data is self-clocked at a constant rate, if the edges of the pits are not in the correct places, errors will be generated."
Here's
a description of what's really going on with the Audio Master Quality Recording technology.
In particular, note this statement:
"The reduction of relative jitter by this technique results in a lower capacity disc (63mins vs. 74mins.), but reduces the need for activation of the error correction concealment circuitry and ultimately results in less audio distortion."
The important thing to recognize here is that the technology ONLY WORKS if the "error correction concealment circuitry" is activated. Unless the CD, CD-R, or CD-R/W, is in extremely poor condition, has been abused, or was not stamped or burned properly, L1 error correction will correct every error, and the concealment circuitry will never be activated.
I use a Plextor PleXWriter 12/10/32A (the "A" indicates that special consideration has been given to audio CD reading and burning). Under Linux/Unix using command line routines it is possible to track the number of L2 errors (uncorrectable errors that must be concealed), and when there ARE L2 errors, the CD will not sound quite right. That is, it will not sound quite like the original. Fortunately, L2 errors are extremely rare, at least in my experience. The ONLY time I see them is when one of the CD-R's my wife uses in her Alpine changer (in her car) stops playing properly. The changer eventually scratches up the surface of the CDR's enough for them to stop playing properly, and when I read them on the PC, I get L2 errors constantly. Hopefully we take better care of the CD's we use in the house.
I'm sure the Yamaha burning technology has merit, I'm just not sure that it's something that will make an audible difference under normal circumstances. More likely that there is a difference in the post conversion filtering or analog section after the DAC that is causing the differences you hear.
See ya,
Chuck</font></td></tr></table>
<font color='#000000'>Hi Chuck,
The Yamaha's 'Audio Master" mode burns bigger pits, it does not however modify sound. Compared to CDs burnt with a normal burner you may or may not find difference. In my experience, some 'Audio Master' CDs I burnt showed a slight improvement over the original specially at high volumes. Never has the data been read incorrectly either on my Accuphase DP-70CV CD player nor on my Yamaha CDX-1050 CP player, even my Yamaha DVD player tracks 'audio master' CDs very well. CDR Info gave the audio master mode a good response and nothing negative was said about that. Yamaha themselves have given considerable amount of data on jitter effect using normal mode and using the audio master mode. The vagaries of improper pits are pronounced using cheap blanks and the high speed of today's burners don't make the tast easy. I mostly record my audio CDs at the speed of 8x using Mitsubishi/Verbatim Super Azo blanks rated at 40x. This is my way of making sure my audio CDs sound as they are supposed to do with minimal jitter. I guess Yamaha realized that higher speeds in the burner market combined with cheap blanks was reducing the quality of burns so they decided to come with the audio master mode.
Commercialy available CDs are stamped, CDR are burned or anealed on CD writers.
L2 errors are rare when sane people do the burning with a properly working burner and good quality blanks. Due to the easy and cheap avaialbility of cheap blanks too many bad recordings show up frequently now a days. CDR diagnostic is one tool which reveal these anomalies to a plumb. I have had the chance to own all three makes of burners. I had a SCSI version of Plextor 12x and it was indeed a good burner. Now I have two SCSI Yamaha 16x burners, one 40x Yamaha burner which has the audio master mode and one Lite-On which to me is a fantastic deal, very little C2 errors and can burn on any crappy blanks. Good for give aways and when you are in a hurry. Burns at an awesome 52x. speed.
Happy listening.
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