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- From: ry01@ns1.cc.lehigh.edu (ROBERT YUNG)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: Sony Mini CD or Philips DCC format for computer DATA?
- Message-ID: <1992Dec21.174552.43337@ns1.cc.lehigh.edu>
- Date: 21 Dec 92 17:45:52 GMT
- Organization: Lehigh University
- Lines: 48
-
- In article <BzEwGp.766@encore.com>, mpalmer@encore.com (Mike Palmer) writes:
- ><FWR100@psuvm.psu.edu> writes:
- >
- >>In article <IBE1109.92Dec16134212@etbsun1.draper.com>, ibe1109@draper.com (Ira
- >>Ekhaus) says:
- >>>
- >>>Hi,
- >>>
- >>>my local audio store says that the new Sony miniCD holds 74 minutes
- >>>of stereo audio and can be RECORDED onto.
- >>>
- >>>Now for 16 bit stereo audio without compression that's
- >>>74*60*44100*2*2 = 783 216 000
- >>>take into account compression factor of (~10) and we're
- >>>still talking over 70 Mbytes with a respectable transer rate.
- >>>The DCC's numbers are probably pretty similar.
- >>>
- >>>Does anyone know of plans to use this format as a backup or
- >>>distribution format for computer data?
- >>>It seems like a good idea, what's up?
- >
- >>First, as far as I know, _no_ compression is used on audio CD's. It's really
- >>700+ MB. Since current audio CD's are approximately as long and CD-ROMs hold
- >>620+ MB formatted, these numbers seem about right.
- >
- >>I haven't heard any announcements for a computer product usind the mini-CDs
- >>but I'd be shocked if this isn't on the shelves by next Christmas. The prices
- >>I've heard were (correct me if I'm wrong) $750 for the the recorder/player and
- >>$16 per disk. If you're using this with a computer, you can remove the
- >>digitizing equipment (44KHz 16 bit stereo ADC) and replace it with a SCSI
- >>interface. Add $250 because it's a computer product, so for $1000 you've got
- >>a 600MB storage device. That's $1.66/MB for the first 600MB, 2.6 cents per MB
- >>afterwards.
- >
- >The audio MD is compressed quite a bit, so I imagine there's only room on the
- >disk for perhaps 100Mb of data, but still 100Mb for $16 isn't bad.
- >
- I don't think there is any compression on MDs or DCCs. I read that they use
- stuff like sound masking to throw away 75% of the data. A 3.5" flopical only
- holds 21mb. I guess a 2.5" would hold much less.
-
- BTW, would it take 74 minutes to read off 650mb of data from a cdrom at
- standard cdrom speeds? And do CDroms have the same data correction as normal
- cds? Thanks!
- --
- ================================== ILAN ======================================
- Query: In Nick's "Salute your shorts" show, what does Z.Z.'s name mean??
- ==================(Robert) Bobby Yung_______RY01@Lehigh.Edu===================
-