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dancing fairies stereo soun demo

PostPosted: Fri Sep 18, 2015 8:18 pm
by olbermann
this file contains on left channel a colour video 12.5fps 32 lines and a non standard audio track on right it can be decoded by a sdr like sodira which can decode it in stereo.
(3.36 MiB) Downloaded 799 times
file containing color 32 lines video on left and my demo of stereo sound audio on right channel is 12 kHz Qam stereo modulated that can be decode with sodira in stereo.

Re: dancing fairies stereo soun demo

PostPosted: Fri Sep 18, 2015 8:55 pm
by Steve Anderson
I'm taking a risk in approving the above post as I have no way of examining to contents of the .wav file.

olbermann, I hope you understand, we've had a lot of problems with 'undesirable' uploads in the past. I'm sure this is OK, but you never know.

If anyone can decode it please inform me/us if it's OK or not.

Steve A.

Re: dancing fairies stereo soun demo

PostPosted: Fri Sep 18, 2015 10:14 pm
by olbermann
this link demonstrate and explain how the file must be decoded,
an explanation can be:
open the file with any nbtv player.
run sodira or dream (software defined radio front end)
when open select audio input speaker or stereo mix so the audio coming from the nbtv player simultaneously drive the sdr.
tune the software at 12 kHz and a bandwidth of 4-5.5 kHz am double sideband ( 9-10 kHz rf bw)
on sodira you can also demux stereo. its AM Motorola QAM Stereo.
audio might content far 4- 5 kHz audible content but if you increase band width you might experience undesirable feedback.
you can also play the file on windows media player. and let the sdr and the nbtv player hear from the stereo mix soudcard.
you might need to setup audio inputs on recording devices.
even you can edit the file, erase the video channel, up convert the file to 48000 kHz and play it directly on sdr software.
but you must first apply an anti alias filter, otherwise you may obtain undesirable noises. I work on sony sound forge for editing and create those mux files

Re: dancing fairies stereo soun demo

PostPosted: Fri Nov 13, 2015 5:38 am
by Lowtone
stéréo ! interesting
but this gave me an idea.
Today we have 5.1 file format, wich can be used with computers and dvd/br players.
Why not using 1 track for vidéo and 2 tracks for sound ( and others for alternate language or else )
or even, having 3 video tracks, 30line, 32line, 60line, all in sync + the 2 remaining tracks for stereo sound :P