Re: [ARSCLIST] CD writing speed

[Jerome Hartke <jhartke@xxxxxxxxxxxx>]

> -----Original Message-----
> From: Association for Recorded Sound Discussion List
> [mailto:ARSCLIST@xxxxxxx] On Behalf Of Bob Olhsson
> Sent: Sunday, January 22, 2006 5:48 PM
> To: ARSCLIST@xxxxxxxxxxxxxxxx
> Subject: Re: [ARSCLIST] CD writing speed
> 
> There's another issue which is reflectance, the potential signal to noise
> ratio available for playback.
> 
> My understanding is that reflectance is reduced as write speed increases.
> Better reflectance makes for more stable playback on ordinary CD players.
> Obviously there is a point of diminishing returns where the poorer error
> rates cause bigger problems.
> 
> Poor reflectance can increase the amount of servo activity. In many player
> designs this will heat up the main crystal which is located on the motor
> control chip and actually affect the sound by altering the playback speed
> and stability. The engineers at Phillips suspect this common player fault
> is where the mysticism around green pens, 1x burning, etc. has an actual
> technical basis. Of course sounding a bit different has nothing at all to
> do with sounding better or more accurate.
> 
> 
> --
> Bob Olhsson Audio Mastery, Nashville TN
> Mastering, Audio for Picture, Mix Evaluation and Quality Control
> Over 40 years making people sound better than they ever imagined!
> 615.385.8051    http://www.hyperback.com

I have never observed any significant dependence of reflectivity on write
speed. High error rates usually occur first, with a possibility of high
jitter and low I3/Itop.

Jerry
Media Sciences, Inc.