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Conference cookie::notes$archive:cd_v1

Title:	Welcome to the CD Notes Conference
Notice:	Welcome to COOKIE
Moderator:	COOKIE::ROLLOW

Created:	Mon Feb 17 1986
Last Modified:	Fri Mar 03 1989
Last Successful Update:	Fri Jun 06 1997
Number of topics:	1517
Total number of notes:	13349

333.0. "new magnavox players (cdpxyz)" by NULL::MCGRATH () Wed Apr 23 1986 23:07

The following two notes about the new (imminent) maggie cd players
and 16 bit dac's came from usenet net.audio.  
_________________________________________________________________
 
I just spoke with someone at North American Philips (Magnavox) about
the new models.  Here's the poop:
 
Magnavox CDP650  due: June  price: $429  features: FTS, remote
Magnavox CDP540  due: July  price: ???   features: remote, no FTS
Magnavos CDP440  due: July  price: $279  features: no FTS, no remote
 
All feature the new chip set, giving them 4x-oversampling, true 16-bit
DACs (a dual DAC in a single package), new higher-performance
error-correction, and nicer looks.
 
 
-- 
	Steve Schley
 
	ihnp4!mmm!schley

Second note about 16 bit dac's:

 
1. All CDs are encoded with 16 bit samples.
2. Machines based on the Philips design use 14 bits, but use 4 times as
   many samples.  By using oversampling and noise shaping, they achieve
   the same performance (96db sn) as a 16 bit machine.
 
Think of it this way.  The output of the digital filter on a 14bit machine
will yield four 14 bit samples for each 16 bit sample read from the disc.
If you were to average the four 14 bit samples, you would come up with a
number extremely close to the original 16 bit sample.  In addition, the
'staircase' effect will be at a much higher frequency, where it can be
removed with a gentle analog filter.
 
-- 
 
Ben Broder
{ihnp4,decvax} !hjuxa!catnip!ben

T.R	Title	User	Personal Name	Date	Lines
333.1		THORBY::MARRA	All I have to be is what You made me.	`Thu Apr 24 1986 07:46`	2
	What is TFS?
333.2		TLE::LIONEL	Steve Lionel	`Thu Apr 24 1986 09:34`	5
	FTS - Favorite Track Selection. A cute feature where the player remembers the program you entered for each of up to 250 (I think) discs, and will automatically use that program when you next play that disc. Great for playing Synchronicity. There's a writeup of the 650 in the latest High Fidelity, I think. Looks like a winner.
333.3	frustrated...	THORBY::MARRA	All I have to be is what You made me.	`Thu Apr 24 1986 10:37`	10
	Question. Will the difference between the 14 bit dac and the 16 bit dac be readily audible? Will it be worth waiting a little longer to get the cdpxxx over the fd2041? will the fd2041 be even cheaper when the cdpxxx comes out? .dave.
333.4	Worth waiting, but 2041 probably won't cheapen	AMBER::KAEPPLEIN		`Thu Apr 24 1986 13:40`	20
	I have preliminary spec sheets on the new chipset. I think it probably will be a better sounding machine. Several reasons: 1. The best error correction in the industry. 2. 18-bit S/N potential from 16bit DACs + 4x oversampling. It might be audible. HFN&RR reviewed the new units that appeared in Europe in Feb. and found only 14bit linearity from the DACs. Philips admits 16bits was mostly for marketing reasons. 3. DACs have seperate ground pins for digital and analog grounds, so hopefully, digital noise will be much lower. Really depends how they lay-out their boards - fewer chips will give them more room though. I suspect they will use the same plastic transport and boxes as the 1041 and 2041. Unknowns are the quality of the single DIP 10-amp/opamp, passive components, and power/grounding. Mark
333.5	ugh - the waiting game!	THORBY::MARRA	All I have to be is what You made me.	`Thu Apr 24 1986 15:12`	3
	oh well, guess i'll wait - hope they get here sooner than july though. .dave.
333.6	New Magies out yet??	LATOUR::TREMBLAY		`Mon Jun 30 1986 09:23`	4
	Anybody seen or have an update on the availability of the new Magnavox players yet? /Glenn