Classic Slow Scan Television (SSTV) Demonstration

Demonstration of classic Amateur Radio SSTV, using 8 second black and white format.

This is the format that was popular in the 1970s prior to the advent of the various color SSTV modes in use today.

This simulation was created using some Linux-based software I wrote.

The sound is music to a slow-scanner's ears. :-)

Category:

Science & Technology

Tags:

• Amateur
• Radio
• Electronics
• Video
• SSTV
• television
• science
• technology

[starmagstarmag]

Hi! I'm an artist based in London. I'm really interested in converting images to sound, and then assimilating them as images again. Could you please tell me if there is a way of transmitting an image from one laptop to another, across a gallery, using sound, during a live performance please? How would I even start investigating this? Thanks for uploading! hope you can help me. Jon

[5UP7]

@starmagstarmag Sorry to say, but this would never work with all the extraneous sounds and reverberation present in the room. :-(

[starmagstarmag]

@5UP7 Thank you for getting back to me. Do you know how I would convert a b&w image into sound and then reassimilate it as an image again? It doesnt necessarily have to be across a room. Can you direct me to a website please that would explain how to do this? i love the noise, and the images!! I think it is really really interesting.....and what would happen with the extraneous sounds and reverberation? would it simply not work at all? or would it interfere with the image? sorry to pester you!

[5UP7]

@starmagstarmag At a very fundamental levels, fax machines convert pictures to sound (so they can travel over telephone lines), and back to pictures again.

However, it would be more practical to use slow-scan television or facsimile software running on a PC with a sound card to perform this function.

> and what would happen with the extraneous sounds and reverberation? would it

> simply not work at all? or would it interfere with the image?

Probably both (total disaster).

[breadtruck1978]

Fascinating.

Thanks to the video game "Portal," I am looking into what this is. Very neat.

[KoiKamiMauro]

Me as well.

[anoori9000]

this is a lie, i recorded it its nothing. i did the sstv signal

[NoDisslike]

Very nice! the only problem is that there's no space between the pics!

[bben95]

@starmagstarmag i think you could do it if you used radio

[Aqlor]

@starmagstarmag that would be possible with error correcting codes, most of communications channels we use nowadays have noise,so codes have been developed so this can be corrected on the fly(think all the noise that is on the wifi and cellphone frequencies). You should use a different format for the images, unless you want to see it working "on the fly" as error correcting codes would require more information to be transmited.

[5UP7]

@gamax92 VIS codes had not been developed and were not used when the 8-second BW mode was in vogue. However, frame sequential RGB color using 8-second frames may use VIS codes of 1, 2, and 3 preceding R, G, and B frames respectively.

15 lines are transmitted each second followed by a 5 ms sync pulse (at 1200 Hz), yielding a video line length of 61.6666 ms. Divide this number by the number of pixels you have to send per line, and follow it with 5 ms of 1200 Hz horizontal sync.