Data Interface

Last changes :
- Full screen
- runtime permission record audio
You will be asked for permission to record audio according to the latest Google guidelines, the user must give runtime permission if the audio jack is used. (Allow record audio.)

If the audio jack is used to decode Pocsag then Android sees this
as Record Audio but nothing is stored on the phone ,it is decoded.


Decode POCSAG

The audio jack is one of the interfaces on mobile devices
and tablets, it's mostly used to play music ,but it can also
be used to receive and decode data.

It can not be connected directly to a receiver, this can damage the receiver/scanner.

A simple circuit is needed to connect a receiver to this audio jack.
( phone/tablet mic-in).

Check also the DataProInterface App it has some more features
see down below.

If POCSAG is decoded most often the unfiltered audio from the
receiver is used (discriminator-output). Some scanners have a discriminator output build in ,but most don't. So if you don't want to crack open your brand new receiver and do some soldering you can try the amplitude decoding mode
which uses the earphone output from your receiver or scanner.

The receivers amplifier has an analogue filter at its output
causing distortion,it seems that the signal collapses
or rises after one bit high or one bit low,this is why it's
so hard to decode with the earphone signal, also each
type receiver has different filters and amplifier so
a standard setting is almost impossible

Another problem is the different specs of the MIC-in circuit
from the different manufacturers of android devices which
results in different amplitude levels when using the same
receiver but different devices.

So after all this how can the right audio level be found.
Well it's been tried with this app with the interface circuit.

This app is a test version there are still some errors in
it, it is used to test if the circuit works on the different devices
but it can decode the POCSAG protocol Function 3 alpha-numeric
most of the time ,however it will not work on some devices.

Improvements or changes DataProInterface app .

- improved audio-level detection
- improved trigger level detection
- POCSAG data can be heard through speaker.(>=4.2.1.0)
- simple address filtering
- email filtering results
- email messages 60-720 minutes
- bit triggering manual(0-80)
- night mode
- read / write settings