Well if you are talking about every channel that is being received
over the cable line then you are going to run into a problem. This
would require a device with one RF tuner for every channel you want to
receive, demodulate, and output. It would then require a dedicated
output for each of these individual channels. (Is this what you're
talking about?)
Essentially, we are describing a cable TV demultiplexer. I'm not sure
that any such device exists in production. It could definitely be
designed and built though. As for ASI output, this would simply be an
extension of the basic device that I described above. Only, instead
of analog composite video outputs or a remodulated single channel
signal over coax, etc... you would digitally encode each channel and
pass it over a dedicated serial interface.
The part of your question about taking the input from a digital cable
box presents a bit of a problem. To my knowledge, most set top boxes
tune to and demodulate the particular channel that you have selected
and this is the only channel available at the output of the box. This
defeats any hope of recovering all digital channels present on the
cable line from the cable provider.
In order to pull off this cable TV demultiplexer idea with digital
cable TV signals you would basicaly have to design a multiplexer with
the set top box capabilities on each tuner so that you may demodulate
and decode the digital channels. Also, some cable providers require
addressable set top boxes that they lease to customers so that they
can control the dispersion of their subscription content only to
paying customers. This would make the device much more complex and
possibly not feasible depending on the cable provider to be used with.
I hope this little bit of information helps. Let me know if you have
any other questions that I could be of assistance with.
Sincerely,
Robert Larino |
