(xlash @ july 28 2004,14:04 Wrote:Quote:cool, so if i understand that correctly you don't really need one (media-)cpu for each tv-tuner (as long as a the cpu is powerfull enough)?, then if taking nexperia as an example you wounld not really need the pnx8550 for two different tv-tuners?, pnx1500 would/could due?
exact, one cpu is enough if the power to process all the data is enough. about the pnx8550, we could take the 1500 and get all the data. however, it may need some cpu power to mux (maybe another small chip) or more inputs on the current x1500. in that case, if we have a data bus for example (as entry), we could deal with all the data at one. it may not be the easiest solution, but i guess some other components already exist to do that. at the end, i could still make a serial+serial 2 fastserial (which mux in time the data (1st package a 2nd b, 3rd a, 4th b, etc...))
i don't think that will be needed(?), the
pnx1500 overview (read whole pdf) show it's designed to do all that (demux/transcode/mux) by itself making the need for a separate cpu for os/sw/mux redundant (as long as the process load is not to heavy, meaning that as long as you don't plan to stream more than one channel at a time the pnx1500 will handle everyone, only if you plan to stream more than one channel at the same time will a separate cpu be needed but then an additianal media-processor will probebely be needed as well in which case the pnx8550 is better suited as it has two media-processor cores and a main-cpu core integrated into the one chip). please take the time to read the whole
pnx1500 pdf overview/specs pdf, i think you then will see what i mean (the pnx1500 even has a built-in 10/100mb ethernet controller, it's like it's designed for tv2lan-lite), all you will need is the pnx1500 and the tv-tuner chip(s).
(xlash @ july 28 2004,14:04 Wrote:ok i didn't heard about that digital terrestrial signal before. in canada, there is no such thing (as i know). however, it may be pretty easy to add for a model for europe, with pal signal encoding. (by the way, radio frequency aren't probably the same in each country... which can lead to different tv-tuner.) our cablodistributor must use some frequency for north american tv (ntsc signal), which can differ in country. i'll have to check those frequency value for each channel from 2 to 99
yes frequences is different in different contries but the
pnx300x chip suppots "multistandard pal, ntsc and secam video decoding" and fm is more or less a universial standard (only thing that's then different is the frequences for video and audio for which you need to code a scanner, fine-tuner and manual frequency selector anyway).
i looked up the terrestrial dtv (digital-tv) standards, dvb-t is a european standard so the philips tda10046ht chip will be good for all of europe, but you need a other dvt chip for usa (atsc) and japan (isdb-t), as those three make up the major markets for selling/buying electronic 'gadgets', so there will not exacly be a need for different chips for each country standard, (the same analog chip for all contries but different dtv chips). i didn't look up digital cable or satellite tv but i think that dvb-c and dvb-s are univerisal standards so if add such chips to future models of tv2lan derivitives then those will be universial too, (anyway that's a lissue to deal with later as terrestrial/air-wave tv and radio should be the only thing deal with in the first model).
the three major digital-tv terrestrial transmission systsems (link to pdf overview):
- atsc system (usa) (and canada?) ...make a separate "tv2lan-lite us" model for this together with the analog chip(?).
- dvb-t system (europe) ...make a separate "tv2lan-lite eu" model for this together with the analog chip(?).
- isdb-t system (japan) ...make a separate "tv2lan-lite j" model for this together with the analog chip(?).
note! i don't thing there is a big buying-market anymore for a only analog tv-tuner, especialy not when make for network, (or?),
so i think it be best if even the "lite" model of the tv2lan supported both analog-tv and terrestrial digital-tv, do you disagree?
ps! as for "friendtech media center", that's off-topic and not related to xbmc, however it's indirectly related to this tv2lan project,
(only indirectly and not directly related to tv2lan because the plan is to make tv2lan client code platform and os independant(?))