KeyFlow 📞⌨️

A DTMF (Dual-Tone Multi-Frequency) and T9-style text converter with real-time translation and audio playback.

🔗 Repo: https://github.com/jhlassen17/KeyFlow

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🚀 Overview

KeyFlow is a utility that bridges classic phone keypad input and modern text processing.

It allows you to:

• Convert DTMF keypad input → text (T9-style)
• Convert text → DTMF sequences
• Hear authentic DTMF tones as you type

Perfect for learning, experimenting, or building telecom-inspired workflows.

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✨ Features

• 📱 DTMF → Text (T9-style)

  • Interpret numeric keypad sequences into readable text

• 🔤 Text → DTMF

  • Convert text into keypad sequences

• 🔊 Real-time tone playback

  • Hear DTMF tones when typing numbers/symbols

• ⚡ Instant conversion

  • Real-time processing as you type

• 🧠 Classic keypad logic

  • Supports traditional multi-tap/T9-style input

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🧑‍💻 Use Cases

• Learning how phone keypads encode text
• Telecom or signal processing experiments
• Debugging or generating DTMF sequences
• Nostalgic T9-style typing tools
• Educational demos

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🔁 Example Conversions

Text → DTMF

HELLO → 4433555 555666

DTMF → Text (T9-style)

7777 33 555 555 666 → HELLO

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🔊 Audio Playback

• Plays authentic DTMF tones for each key press
• Helps simulate real telephone keypad behavior
• Useful for:
  • Learning tone patterns
  • Debugging signal flows
  • Interactive demos

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⚙️ How It Works

1. User inputs text or keypad numbers
2. Input is parsed using T9/DTMF mapping
3. Output is generated in real time
4. Optional audio feedback plays corresponding tones

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🛠️ Tech Stack

• C#
• .NET
• Audio generation (DTMF tone synthesis)
• Event-driven input handling

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📦 Installation

git clone https://github.com/jhlassen17/KeyFlow.git
cd KeyFlow
dotnet build
▶️ Usage
Run the application:

bash

dotnet run

Then:

Enter numbers to hear tones and convert to text Enter text to generate DTMF sequences

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⚠️ Notes

• Tone playback depends on system audio capabilities
• Timing and spacing affect T9 interpretation
• Behavior may vary slightly depending on implementation details

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🔮 Future Enhancements

• Adjustable tone duration and frequency visualization
• T9 predictive text mode
• GUI improvements
• Export tone sequences as audio files
• Support for pause/delay symbols
• Waveform display

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🤝 Contributing

Contributions are welcome!

• Open issues for bugs or ideas
• Submit pull requests for improvements

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📄 License

This project is licensed under the MIT License.

See the full license in the LICENSE file.

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👨‍💻 Author

Jeffrey Lassen
Version: 1.0.1.2
Last Updated: 05/16/2026

https://github.com/jhlassen17

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☕ Support

If you find this useful:
👉 https://buymeacoffee.com/hanf

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