Assempix

Assempix decodes COFDMTV encoded audio signals to images.

Find Assempix on the Google Play Store

You can install Assempix from the Google Play Store:

https://play.google.com/store/apps/details?id=com.aicodix.assempix

Automatic gain control ruining the signal per Default

Usually the Default setting is fine, unless the device vendor decides to “enhance” it.

As you can see, the input signal got attenuated in the middle of the transmission.

This usually causes demodulation errors for one or two symbols around the transition point.

Disable all audio “enhancing” features for a perfect decode

Unfortunately not all devices support Unprocessed as Audio Source.

In that case, you might want to try Voice Recognition as Audio Source.

Two microphones and Unprocessed is doing auto gain

You can either select:

• First (usually left microphone)
• Second (usually right microphone)
• Summation (of both microphones)

Summation works well if the audio source has the same distance to both microphones.

Privacy Policy

To decode COFDMTV encoded audio signals, Assempix needs access to the microphone.
Having access to the microphone is considered to be a sensitive permission and you
have the right to know what Assempix does with that access:
The data recorded from the microphone is only used to feed the COFDMTV decoder,
VU meter and the spectrum analyzer for visualization of its frequency content.
Assempix uses a very small temporary buffer in volatile memory and constantly
overwrites that buffer with new data from the microphone.
The resulting images from the COFDMTV decoder is the only data that gets stored
in persistent storage on your device.