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Television Standards Converters, Modulators etc Standards converters, modulators anything else for providing signals to vintage televisions. |
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20th Aug 2011, 1:56 pm | #141 |
Hexode
Join Date: Jan 2005
Location: Waterford, Republic of Ireland
Posts: 259
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Re: Simple memory card player idea
Fair play to you Karen - nice job!
(I also need to buckle down and learn PIC programming) |
20th Aug 2011, 2:46 pm | #142 | |
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Re: Simple memory card player idea
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20th Aug 2011, 6:37 pm | #143 |
Dekatron
Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
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Re: Simple memory card player idea
Anyone know if the PIC development stuff is either available in Source Code, or usable with WINE? Kat?
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If I have seen further than others, it is because I was standing on a pile of failed experiments. |
21st Aug 2011, 1:19 am | #144 | |
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Re: Simple memory card player idea
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21st Aug 2011, 4:49 pm | #145 | |
Octode
Join Date: Nov 2004
Location: Hebden Bridge, West Yorkshire, UK.
Posts: 1,885
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Re: Simple memory card player idea
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There are some Linux-native PIC development tools too...gputils springs to mind I even made my own PIC programmer that ran on the serial port in Linux...if you're interested I've probably still got the sourcecode somewhere...trouble was making changes for each different PIC chip Karen, any chance of putting your sourcecode for the PIC up somewhere (or sending it by PM)? I'd be interested in a look see, though I'd still like to do a "format neutral" version that just streams samples out. I've got some weird experimentation to do to try and work out what is going on with a Prototype ART decoder that I need to figure out and being able to feed it a picture would be great! Dom PS: Congrats on getting a nice glitch free picture so quickly! |
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21st Aug 2011, 9:35 pm | #146 |
Hexode
Join Date: Jan 2005
Location: Waterford, Republic of Ireland
Posts: 259
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Re: Simple memory card player idea
I think the Pinguino PIC development system is available for Linux and Mac as well as Windows
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21st Aug 2011, 9:44 pm | #147 |
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Re: Simple memory card player idea
Hi Dominic,
I'm documenting the project at the moment. I'll let you know when its ready for release. I too am giving thought to a more continuous replay but for high end NBTV (e.g. 60 lines), using an SD card, aiming at a video bandwidth of around 100kHz. Something to bear in mind if you go for continuous replay - my 405 line player exploits the frame blanking period to place time between issuing the read command, which happens during frame sync, and the data transfers that happen during the active picture lines. This gives the card around 1msec to sort itself out. If you want continuous transfer at rates comparable to my 405 line data transfer rate (6.25MHz) without a break then you are going to have to use a lot of buffering and this will force you to use a more conventional approach with a much more powerful processor and memory. It might be easier to design a video latch peripheral for a small Linux computer. Thanks for the congrats. I'll have to look out for a meet or convention and bring it along to show everybody! |
28th Aug 2011, 10:52 am | #148 |
Heptode
Join Date: Jan 2004
Location: Blyth, Northumberland, UK.
Posts: 858
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Re: Simple memory card player idea
Just Watched the Video, I have to say well done Karen, that's brilliant.
I do some PIC coding but only simple stuff like a Geiger counter interface and a couple of motorcycle engine management based projects, nothing on this level of complexity. What's next? a file system, user interface and a hard disk? Dave. |
29th Aug 2011, 9:18 am | #149 | ||||
Retired Dormant Member
Join Date: Jul 2005
Location: West Yorkshire, UK.
Posts: 1,700
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Re: Simple memory card player idea
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I did notice this in Wikipedia - PIC microcontroller - Performance: Quote:
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Drifting finally back to the topic, now I've caught up; excellent work, Karen. I'll be interested in a look at this once you've finished documenting it and released it Kat |
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27th Sep 2011, 1:42 am | #150 |
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Re: Simple memory card player idea
I've finished building my ETF modulator and used it successfully with my CF player. I would recommend the ETF modulator - an excellent design.
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27th Sep 2011, 11:56 am | #151 |
Hexode
Join Date: May 2005
Location: London 90% , Northwest England 10%
Posts: 385
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Re: Simple memory card player idea
Not that I understand much of the above , but does an Aurora take a to-air(Sky/Cable/Freeview/Analogue TV signal on input and convert immediately to 405line output for viewing? Can your system output to 405line video recorders ( tape machines from philips and the like ).
Ian |
27th Sep 2011, 12:05 pm | #152 |
Retired Dormant Member
Join Date: Dec 2003
Location: North London, UK.
Posts: 6,168
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Re: Simple memory card player idea
An Aurora SCRF405A takes any 625 line video signal and gives 405 line video and modulated RF outputs. The video can come from any Freeview box, Sky box, DVD player etc. Conversion is immediate and real time. Well perhaps a few 100 microseconds delay
http://www.tech-retro.com/Aurora_Design/Home.html Other versions give 819 lines, 441 lines, 30 lines etc If Karen's design outputs a standard 405 line video signal this can be recorded on many VCRs. Tends to work better on older machines that don't have too much fancy processing. It will not work with DVD recorders. But since the Aurora is readily available there is no real reason to do this nowadays. |
7th Oct 2011, 11:53 pm | #153 |
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Re: Simple memory card player idea
I've just watched part 1 of 'The Dalek Invasion of Earth' on my CF player and using my ETF modulator!
Considering the recording has been through 405-to-625 and back again it's pretty good. I had one problem: The C program I wrote had to be recompiled for 64 bit file offsets as it couldn't read the 6GB raw video file! |