From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from nm15.bullet.mail.ukl.yahoo.com ([217.146.183.189]:33391 "HELO nm15.bullet.mail.ukl.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1759166Ab2EEDcZ (ORCPT ); Fri, 4 May 2012 23:32:25 -0400 Message-ID: <4FA49DB4.9080206@yahoo.co.uk> Date: Sat, 05 May 2012 04:25:40 +0100 From: Hin-Tak Leung MIME-Version: 1.0 To: Antti Palosaari CC: linux-media , will.cooke@canonical.com, Greg KH Subject: Re: GSoC 2012 Linux-Media! References: <4FA291F5.3000103@iki.fi> In-Reply-To: <4FA291F5.3000103@iki.fi> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: 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