Re: CD

[Nam-Trung Nguyen <namtrungnguyen_vnsa@yahoo.com>]

Hi ba'c Huy Du+o+ng,
Trong 288 byte cuo^'i, 4 byte du`ng dde^? ti`m lo^~i,
276 byte du`ng dde^? su+?a lo^~i, va` 8 byte kho^ng du`ng dde^'n. Trong
Audio-CD ne^'u ti`m ra lo^~i, ma'y tu+. ddo^.ng nga('t tie^'ng ma`
kho^ng su+?a lo^~i. Trong Data-CD ma'y se~ ti`m ca'ch ddo.c la.i
nhie^`u la^`n va` so sa'nh ke^'t qua? (xem lo^~i dde^'n tu+` du+~
lie^.u hay ba?n tha^n ma~ lo^~i), sau ddo' 276 byte ma~ su+?a
lo^~icddu+o+.c du`ng dde^? phu.c ho^`i du+~ lie^.u ban dda^`u
(Algorithm
su+?a lo^~i the^' na`o to^i kho^ng bie^'t!!!)
Trung

--- HUY DUONG <huy.duong@ctsu.ox.ac.uk> wrote:
> Ca'm o+n ba'c Trung.
> 
> Tui tha^'y phu.c va'i technology na`y la` la`m sao
> ngu+o+`i 
> ta nhe't -du+o+.c ~ 5 ty? bits le^n 1 die^.n ti'ch
> nho? nhu+
> va^.y ma` va^~n -do.c -du+o+.c khi tre^n dia~ co'
> nhie^`u
> ne't tra^`y & ve^'t do+.
> 
> >Ma~ lo^~i dduo+.c ga'n theo 1 sector (2048byte),
> hi`nh
> >nhu+ co' 16 byte dda^`u va` 288 byte cuo^'i cu?a
> sector
> >la` ma~ CRC (cyclic redudancy code). To^i nghi~ la`
> ma'y CD ddo.c
> >nhie^`u du+~ lie^.u va`o bo^. nho+' dde^.m,sau ddo'
> ti`m ma~ lo^~i 
> >song song vo+'i qua' tri`nh chuye^?n ti'n hie^.u
> so^' ra ti'n hie^.u 
> >tu+o+ng tu+.
> 
> Ne^'u "tha^'y" du+~ lie^.u & ma~ lo^~i kho^ng
> consistent
> thi` la`m gi`?
> 
> Huy 
> 

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