Hi Antti,
I promised to put you in touch with some more knowledgeable people, so here they
are. Will made a few comments during our discussions (inserted verbatim below -
may or may not be relevant)... Please feel free to respond to Mr Cooke and/or
write to him and Greg.
Hin-Tak
Will Cooke wrote:
> The hacks with USB stick are entirely reliant on the chips inside the stick. In
> this case, the demod (Realtek RTL2832U)has the ability to pass through to the
> USB bus raw 8-bit sampled RF called I/Q
> (http://zone.ni.com/devzone/cda/tut/p/id/4805).
>
> Once you have this raw I/Q data you can demodulate the signals and process them
> in software. So it's possible to build an FM radio, an AM radio, a DAB radio,
> Ham radio, Packet radio, slow scan TV, basically anything which modulates a sine
> wave within the frequency range of the tuner inside the DVB stick. Not all DVB
> tuners are created equal. Some will be limited to n hundred MHz, some have a
> range as low as 50 or 60 MHz up to a few GHz.
>
> Chips that have this functionality AND are built in to DVB USB sticks AND cost
> less than 20 Dollars are few and far between. So it's pretty rare to find a
> compatible USB stick, and not every USB stick can pull off this neat trick.
>
> There is probably scope to run a project around a single targeted DVB USB stick,
> but hardware support would be limited. GNU Radio is a good tool to build the
> remodulators. As an example real world application, how about building one of
> these sticks in to a laptop and integrating it with the audio stack. Now my
> laptop comes with a TV tuner, an FM tuner, a DAB tuner, and so on.
>
> I hope that helps set the scene a little bit more. Let me know if you need any
> more help.
>
> Cheers, Will
Will Cooke wrote:
> Hi Till!
>
> I am familiar with what a USB-DVB stick is, how it works, the inside of a DVB
> transport stream, and so on, but... I'm in no way an expert, and I'm in no way a
> developer!
>
> Depending on what sort of mentoring you had in mind, I would be happy to get
> involved.
>
> Can you let me know a little more about the project and what kind of input you
> need from me.
>
> Cheers, Will
Antti Palosaari wrote:
Moikka!
As I have mentioned many people already, I have got Google Summer of Code
project for the Linux-Media! It means I can do three months full time work
starting from the week 21 (21.05.2012). Originally I applied "Open firmware for
ath9k_htc" -project as that was listed but I added own topic for Linux-Media
related stuff and it was accepted.
It is rather much time I can spend and fix all those problems I have seen during
recent years. Schedule is first to fix all DVB USB problems and then move to
enhancing DVB CORE / frontend. I planned only general digital television stuff
since it is what I know best. But if there is some time I can likely do some
other general fixes.
Here is short description.
http://www.google-melange.com/gsoc/project/google/gsoc2012/crope/10001
I will open another thread just discussing what are the most important things
and how those should be fixed "correctly".
And there is no blog yet, but sometime ago I created LinuxTV page for Google+.
Lets use it:
https://plus.google.com/u/0/111350562770777789175/posts
And my mentor is Hin-Tak Leung.
regards
Antti
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