Voice Changer Application
Platform: MIT App Inventor
Category: MIT App Development
Skill Level: Beginner to Intermediate
Project Overview
The Voice Changer Application is a fun and engaging mobile app that allows users to record their voice and apply sound effects such as robot, echo, fast, slow, or reverse playback. Built using MIT App Inventor, the project is perfect for beginners who want to learn block-based programming and understand how mobile apps process audio.
The app demonstrates key app development concepts:
- Using sensors and multimedia components
- Handling user input
- Applying conditional logic with blocks
- Designing user-friendly mobile interfaces
Features of the Application
- Voice Recording
Users can tap a button to record their voice using the phone’s microphone. - Voice Playback with Effects
After recording, users can apply effects such as:- Slow Playback: Reduces speed for a deep voice.
- Fast Playback: Increases speed for a chipmunk-like voice.
- Echo: Simulates an echoing sound.
- Robot Effect: Uses filters for robotic audio (may use extensions).
- Reverse Audio (if implemented with extensions or logic).
- Clean UI
Simple layout with labeled buttons like:- “Record”, “Play”, “Stop”, “Apply Echo”, etc.
- Sliders (optional) for pitch or speed.
- Save Audio Files
Users can optionally save their recordings for later playback.
Components Used in MIT App Inventor
- SoundRecorder – Records voice input
- Player – Plays audio
- Buttons – Triggers for user actions
- Label – Displays status
- Clock (optional) – For timing and delay-based effects
- TinyDB (optional) – For storing previous recordings
- Extensions – For pitch, robot, or reverse effects (e.g., TaifunPlayer, Audio Effects Extension)
Learning Outcomes
- Learn how to use MIT App Inventor’s multimedia components.
- Understand the flow of audio processing in mobile apps.
- Practice designing interactive UIs.
- Gain basic experience in logic structuring using visual programming blocks.
- Enhance creativity and presentation through a personalized app.
Deployment and Testing
- App is exported as
.apkand tested on any Android device. - MIT AI2 Companion app is used for real-time testing during development.
voice-changer-app_watermark
Download App Source code
Potential Future Enhancements
- Add pitch control sliders for custom voice effects.
- Integrate background music mixing.
- Add cloud storage integration (Firebase).
- Share recordings via WhatsApp or email.
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