Anyone know if have a way to decode a TV signal (analogic or digital) with an Arduino?
The goal is extract the video, audio and text (closed caption) from this signal and reproduce it separately.
Did you have a look at how such signals are built up ?
It's really very unlikely that what you want to do will be successful, but then again i don't know what exactly you want to do.
But if you have a composite or RGB signal, you might be able to capture the teletext signal.
What do you mean by "TV signal"?
The only time that all the components are together is in the RF signal going into the Antenna. They are quickly separated into their separate "streams" and processed separately.
No, the Arduino boards aren't able to do real-time video processing.
KeithRB:
What do you mean by "TV signal"?
The only time that all the components are together is in the RF signal going into the Antenna. They are quickly separated into their separate "streams" and processed separately.
NTSC - Wikipedia
ATSC standards - Wikipedia
I realy don't know if use an Arduino is the best approach, but when the signal comes from the Antenna, i want to save all this streams in diferent files.
The video stream is not important now, but the audio and the text is.
I'm making a speech to text process, and I need a database from my country of the audio and the correct text of this audio...
So, I think if can I use Arduino to read this data from the Antenna.
No.
Get a dedicated TV decoder.
The signal from the antenna is at 600 to 900 MHz.
How do you think a 16 MHz processor can cope with that?
Hi, hope your not assuming that the text follows the audio exactly.
The text conversion companies do take shortcuts at times with text.
Also if it is live conversion, then you will be lucky to get 75% correct text.
Your project has been done before, google..
Tom..... 
great!
http://forum.arduino.cc/index.php?topic=120739.0
possible
http://nootropicdesign.com/projectlab/2011/03/20/decoding-closed-captioning/