DTMF Decoder

DTMF Decoder is a handy tool that can process dial tones from touch tone phones and log the phone numbers they correspond to. It works by grabbing the tone signals from the telephone line or radio receivers, sending them to your computer's sound card for processing. Pretty cool, right?

How DTMF Decoder Works

This application identifies sounds it captures and detects their frequencies. This helps link the sounds to specific keys on the phone's number pad. So, if you use it, you'll be able to see which number was dialed and when the call happened!

Getting Started with DTMF Decoder

Before diving in, you'll need to set up your audio capture device. This could be a microphone connected to your computer. Also, don't forget to adjust your audio mixer settings for everything to work smoothly.

Main Window Features

The main window has two green bars that pick up incoming tones, each covering different frequency ranges. For DTMF Decoder to function properly, make sure you set the threshold (shown by a red line) just right. A tone is seen as valid only when its level goes above this threshold by about 6 dB.

Tuning Your Settings

If you change the volume settings on your sound card, you'll have to tweak that threshold again since the captured tones will come in at a different level.

Test Example and Configuration Options

Don't worry if you're new! DTMF Decoder includes a test example that helps you learn how it works and assess its features. You can also set minimum tone lengths and breaks as needed.

Saving Your Data

The data collected is saved automatically into a text file on your computer for future reference. This makes it super easy to keep track of what you've captured!

Who Can Use It?

DTMF Decoder is great for audio and forensic technicians who need to figure out what phone numbers were dialed. Configuring it isn't too hard either—especially if you've got some tech know-how!

If you want more details about DTMF Decoder, check out this link!