Thanks I try transmitting audio but I don't know how to set offset to 5.5 Mhz for PAL B/G (Video works fine) and don't know how to set devitation to 25 khz (should I use NBFM Modulator block or WBFM Modulator block
PS: How to encode Video in PAL? (any command in VLC (like in DVB-T where you can encode MPEG 4 with it) PPS: Is posible to encode and transmitt in real time (I start a movie in VLC then Video get encoded and Audio get transmitted using GNU Radio (can I use stdin and stdout pipes to fed encoded Video and Audio to GNU Radio?) Thanks for Anwsering and Best Regards 2015-05-26 5:25 GMT+02:00 Paul Connolly <[email protected]>: > I don't think that anyone has transmitted teletext with the HackRF (yet) > , but I could be wrong ? > Teletext never caught on in the US, so you may have to go to the standard > http://www.etsi.org/deliver/etsi_i_ets/300700_300799/300706/01_60/ets_300706e01p.pdf > > The NTSC flow graph ( https://github.com/argilo/sdr-examples ) had some > modifications done to it and there is now a PAL flow graph ( > https://github.com/miek/sdr-stuff ) > > As for the Audio, it is a separate FM signal ( 25 kHz instead of 75 kHz > used for FM radio station) at an offset to the video carrier. And that > offset is different for a lot of the PAL broadcast systems > (PAL-B/D/G/H/I/K/M/N) > See this for the details for each PAL version: > https://en.wikipedia.org/wiki/PAL#PAL_broadcast_systems > There is a good graphic of the PAL transmission modulation scheme here > https://en.wikipedia.org/wiki/PAL#Colour_encoding > It is very similar to the one for NTSC ( > https://en.wikipedia.org/wiki/NTSC#Transmission_modulation_scheme ) which > might be useful for comparison. > > > > On 25/05/2015 07:59, Mitja kocjančič wrote: > > Hi anyone know how I can transmitt PAL with sound and generate Teletext? > > I only know how to make simple FM Transmitter not TV one in GNU Radio > > So could anybody help me with building GNU Radio PAL with Sound transmitter > > you can transmitt ATSC, DVB-T2 but you can't transmitt Analog? (strange) > > Thanks for helping and Best regards > > > > > _______________________________________________ > HackRF-dev mailing > [email protected]https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > > > > _______________________________________________ > HackRF-dev mailing list > [email protected] > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > >
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