Two Tone Paging Code

Hello everyone! I am new to programming and need some pointers.

I am trying to write a program that generates tones. I know how I want the program to work, but I have no clue on how to write the code.

The program needs to generate 2 tones, which are defined by the user input. The first tone is one second long, followed by a three second tone.

The user input follows the Motorola general encoding plan found here in table 1 http://www.midians.com/pdf/tone-signaling-charts.pdf .

I am programming a RaspberryPi model B using Python.

I would like to have a code that based on a 3 digit user input, would generate tone A and tone B. Tone A is 1 second long and Tone B is 3 seconds long.

The 1st digit would select the plan, i.e. which "Reed Groups" the tone are selected from. The 2nd and 3rd digit selects the tone from each Reed Group.

Examples;

A 394 would generate a 1 sec / 3 sec tone of (539.0 Hz / 707.3 Hz).

A 703 would generate a 1 sec / 3 sec tone of (321.7 Hz / 651.9 Hz).

Any help would be greatly appreciated!

James

Top Replies

shabaz over 10 years ago +1

The DAC as mentioned by Ambrogio will work. There is also an in-built audio output on the RPI which you could use if you choose. From what you say, it sounds like you only want one tone at a time? In that…

0 amgalbu over 10 years ago

Hi
I think you will need a breakout board with DAC like this one
https://learn.adafruit.com/mcp4725-12-bit-dac-with-raspberry-pi/using-the-adafruit-library

Then adding the logic should be a trivial task... should you have difficulties, just ask!!
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0 shabaz over 10 years ago

The DAC as mentioned by Ambrogio will work. There is also an in-built audio output on the RPI which you could use if you choose.
From what you say, it sounds like you only want one tone at a time?
In that case, perhaps you could just script what you want, e.g. if Python allows you to call any arbitrary program, then try speaker-test (it has parameters for frequency and period).
There are other ways to do what you want - e.g. create your own tones on-the-fly perhaps, or even use stored audio files since SD cards have plenty of space.
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0 amgalbu over 10 years ago

Definitely if you need to generate one tone at a time the solution proposedby shabaz is easier... my initial thought was that you were going to generate two tones at the same time (somtething like DTMF).
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