Decoding ISS SSTV Audio Recordings with A Virtual Audio Cable

Screenshot from 2017-07-25 12-43-40

If you recorded your ISS SSTV receptions to mp3, wav, or something else you can use a virtual audio cable to play the recording through software directly into the decoder.

This is better than some sort of physical audio connection like a cable going from another computer or voice/audio recorder into the computer microphone or line input of the system decoding the SSTV, as a virtual audio cable reduces or completely eliminates the likelihood of introducing more noise. It also reduces or completely eliminates the likelihood of losing any information from the recording. Finally, it’s easier to use once you get it setup.

An example configuration could use Audacity audio software with MMSSTV decoding software. Audacity “speaks” to the virtual audio cable and MMSSTV “listens” to the virtual audio cable. The example in the screenshot above is Audacity with QSSTV on Linux using a Pulseaudio based virtual audio cable.

Here are programs/packages/information you need to get this going on the major operating systems.

Windows: VB-Cable (Virtual Audio Cable)

Mac: Soundflower-2.0b2.dmg (details)

New Mac alternative to Soundflower: Loopback

Linux: Pulseaudio module-virtual-source with pavucontrol (you can also use JACK but it is more complicated to setup)

73, John Brier KG4AKV