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Palettes are just simple PNG images, 256x256px in size with 24bit RGB color.

To stop the decode and calibrate the image simply kill the sox process. Sox -t pulseaudio alsa_output.pci-0000_00_1b.0.analog-stereo.monitor -c 1 -t wav /tmp/aptaudio The following decodes the audio coming from the audio device pulseaudio alsa_output.pci-0000_00_1b.0.analog-stereo mkfifo /tmp/aptaudio

t: Crop telemetry (only effects raw image)Īptdec even supports decoding in realtime.

k Map offset (in px, default: 0) Image output types aptdec -d images *.wavĪpply a denoise filter (see Post-Processing Effects for a full list of post-processing effects). aptdec -o image.png gqrx_20200527_115730_137914960.wavĭecode all WAV files in the current directory and put them in images mkdir images &. Using the Makefile with GNU automake is now deprecated and will be removed soon. Quick start sudo apt install cmake git gcc libsndfile-dev libpng-dev Sample rate doesn't matter, although lower samples rates will process faster.

The input audio format can be anything supported by libsndfile (although only tested with WAV and FLAC). MCIR: a false color that uses a underlay map for color.

Palleted image: a image where the color is derived from a palette (false color, etc).Temperature image: a temperature compensated image derived from the IR channel.Individual channel: one of the channels form the image.Raw image: both channels with full telemetry included.Then the transmission can be decoded in narrow FM mode.Īptdec can turn the audio recordings into PNG images and generate images such as: These transmissions can easily be received with a cheap SDR and simple antenna.

These satellites transmit constantly (among other things) medium resolution (4km/px) images of the earth over a analog mode called APT. Copyright (c) 2004-2009 Thierry Leconte (F4DWV), Xerbo ( 2019-2020Īptdec is a FOSS program that decodes images transmitted by NOAA weather satellites.