Anybody can give some detail information? I also wonder if they are soft-output error control coding... thanks a lot, -Walala
what error control coding do CD, VCD, DVD, MD, etc. use?
Started by ●April 9, 2004
Reply by ●April 9, 20042004-04-09
CD contains a cross-interleaved extended (32,28) Reed-Solomon code. --RY "walala" <mizhael@yahoo.com> writes:> Anybody can give some detail information? > I also wonder if they are soft-output error control coding... > > thanks a lot, > > -Walala > >-- % Randy Yates % "Though you ride on the wheels of tomorrow, %% Fuquay-Varina, NC % you still wander the fields of your %%% 919-577-9882 % sorrow." %%%% <yates@ieee.org> % '21st Century Man', *Time*, ELO http://home.earthlink.net/~yatescr
Reply by ●April 10, 20042004-04-10
On Fri, 09 Apr 2004 23:59:15 GMT, in comp.dsp you wrote:>CD contains a cross-interleaved extended (32,28) Reed-Solomon code. > >--RYMore recently, LDPC have started to be one of candidates. You may easily find ths fact by serching the Internet using e.g. Google. -- James SJ Kim
Reply by ●April 10, 20042004-04-10
James K. <txdiversity@hotmail.com> writes:> On Fri, 09 Apr 2004 23:59:15 GMT, in comp.dsp you wrote: > >>CD contains a cross-interleaved extended (32,28) Reed-Solomon code. >> >>--RY > > More recently, LDPC have started to be one of candidates. > You may easily find ths fact by serching the Internet using e.g. > Google.You mean for the new formats, not CD, right? -- % Randy Yates % "Ticket to the moon, flight leaves here today %% Fuquay-Varina, NC % from Satellite 2" %%% 919-577-9882 % 'Ticket To The Moon' %%%% <yates@ieee.org> % *Time*, Electric Light Orchestra http://home.earthlink.net/~yatescr
Reply by ●April 10, 20042004-04-10
"Randy Yates" <yates@ieee.org> wrote in message news:u0zsaw1i.fsf@ieee.org...> James K. <txdiversity@hotmail.com> writes: > > > On Fri, 09 Apr 2004 23:59:15 GMT, in comp.dsp you wrote: > > > >>CD contains a cross-interleaved extended (32,28) Reed-Solomon code. > >> > >>--RY > > > > More recently, LDPC have started to be one of candidates. > > You may easily find ths fact by serching the Internet using e.g. > > Google. > > You mean for the new formats, not CD, right? > -- > % Randy Yates % "Ticket to the moon, flight leaves heretoday> %% Fuquay-Varina, NC % from Satellite 2" > %%% 919-577-9882 % 'Ticket To The Moon' > %%%% <yates@ieee.org> % *Time*, Electric Light Orchestra > http://home.earthlink.net/~yatescrHow about DVD, MD, etc. then? Is solomon code soft output code such as Viterbi coding?
Reply by ●April 10, 20042004-04-10
"gino" <mizhael@yahoo.com> writes:> "Randy Yates" <yates@ieee.org> wrote in message > news:u0zsaw1i.fsf@ieee.org... >> James K. <txdiversity@hotmail.com> writes: >> >> > On Fri, 09 Apr 2004 23:59:15 GMT, in comp.dsp you wrote: >> > >> >>CD contains a cross-interleaved extended (32,28) Reed-Solomon code. >> >> >> >>--RY >> > >> > More recently, LDPC have started to be one of candidates. >> > You may easily find ths fact by serching the Internet using e.g. >> > Google. >> >> You mean for the new formats, not CD, right? >> -- >> % Randy Yates % "Ticket to the moon, flight leaves here > today >> %% Fuquay-Varina, NC % from Satellite 2" >> %%% 919-577-9882 % 'Ticket To The Moon' >> %%%% <yates@ieee.org> % *Time*, Electric Light Orchestra >> http://home.earthlink.net/~yatescr > > How about DVD, MD, etc. then?How about them?> Is solomon code soft output code such as Viterbi coding?Soft symbols are the OUTPUT of the demodulator and the INPUT to the decoder. In no case (including Viterbi) is the decoder output soft. -- % Randy Yates % "...the answer lies within your soul %% Fuquay-Varina, NC % 'cause no one knows which side %%% 919-577-9882 % the coin will fall." %%%% <yates@ieee.org> % 'Big Wheels', *Out of the Blue*, ELO http://home.earthlink.net/~yatescr
Reply by ●April 10, 20042004-04-10
On Sat, 10 Apr 2004 11:49:05 GMT, Randy Yates <yates@ieee.org> wrote:>You mean for the new formats, not CD, right?That's right. To see further information of LDPC, it ccould be good way to refer the presentation of the brief introduction of LDPC codes sited at http:\\www.csee.wvu.edu/wcrl/public/slideldpc.pdf. BR, ------ James K. (txdiversity@hotmail.com) - Any remarks, proposal and/or indicator would be greatly respected. - Private opinions: These are not the opinions from my affiliation. [Home] http://home.naver.com/txdiversity
Reply by ●April 10, 20042004-04-10
On Sat, 10 Apr 2004 19:50:39 GMT, Randy Yates <yates@ieee.org> wrote:> In no case (including Viterbi) is the decoder output soft.Right, the decoder output of Viterbi is of cause not soft, but how about considering some enhanced scheme including SOVA (Soft-Oupt Viterbi Algorithm), which tends to generator the soft output, so as to transfer its output to its neighbor decoder for successful iterative decoding. BR, ------ James K. (txdiversity@hotmail.com) - Any remarks, proposal and/or indicator would be greatly respected. - Private opinions: These are not the opinions from my affiliation. [Home] http://home.naver.com/txdiversity
Reply by ●April 11, 20042004-04-11
"James K." <txdiversity@hotmail.com> wrote in message news:1a5h705352cifl43cpro75vqubpkrs8oac@4ax.com...> On Sat, 10 Apr 2004 11:49:05 GMT, Randy Yates <yates@ieee.org> wrote: > > >You mean for the new formats, not CD, right? > > That's right. To see further information of LDPC, it ccould be good > way to refer the presentation of the brief introduction of LDPC codes > sited at http:\\www.csee.wvu.edu/wcrl/public/slideldpc.pdf. > BR, > ------ > James K. (txdiversity@hotmail.com) > - Any remarks, proposal and/or indicator would be greatly respected. > - Private opinions: These are not the opinions from my affiliation. > [Home] http://home.naver.com/txdiversityWill LDPC be used in CD, DVD, etc. any time soon? Or it is anohter attractive tech. which will never be adopted by the market?
Reply by ●April 12, 20042004-04-12
"Randy Yates" <yates@ieee.org> wrote in message news:r7uw7l72.fsf@ieee.org...> CD contains a cross-interleaved extended (32,28) Reed-Solomon code.This is not quite correct. Cross-interleaving is indeed used in CDs, but the (32, 28) Reed-Solomon code is not over GF(2^5) = GF(32), and thus is not an extended Reed-Solomon code in the usual sense of the word (add an overall parity check symbol to a code of length one less than the size of the field). The (32, 28) Reed-Solomon code used in CDs is over GF(2^8) and can be thought of as a shortened version of a (255, 251) Reed-Solomon code. In fact, TWO Reed-Solomon codes are used in CDs; a (32, 28) code and a (28, 24) code; and both have 8-bit symbols. Extensive details can be found in Chapter 4 of the book "Reed-Solomon Codes and Their Applications" (S. B. Wicker and V. K. Bhargava, eds.) IEEE Press, 1994.
