WaveScope

WaveScope is a real-time audio signal processing and visualization device that demonstrates two core principles in digital signal processing: modulation and filtering.
It captures sound from an electret microphone (MAX4466), processes it using advanced DSP techniques on an STM32 NUCLEO-F767ZI microcontroller, and sends the results to a computer for real-time audio feedback and plotting.

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Features

• Real-Time Audio Capture from an electret microphone (MAX4466)
• Biquad Filter for precise frequency-based filtering
• Kalman Filter for dynamic noise reduction and signal smoothing
• Double-Precision Floating-Point Processing on STM32 for high accuracy
• USB Data Transmission to PC for visualization and playback
• Dual Recording Modes: raw and processed audio
• LED Feedback System for recording status
• Amplification & Low-Pass Filtering for improved clarity

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Motivation

This project was born from a passion for control theory and digital signal processing — two fields that form the backbone of modern engineering, from audio and video to data transmission and sensor systems.
Mathematics, to me, is a form of art. WaveScope is my way of blending that art with engineering, offering both visual and auditory interpretations of mathematical concepts.

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Hardware Components

Component	Purpose
NUCLEO-STM32F767ZI	Main computational unit, DSP processing, USB data transmission
MAX4466 Electret Microphone	Captures analog audio signal
Amplifying Circuit + Low-Pass Filter	Boosts signal and reduces high-frequency noise
Red Button	Triggers raw recording
Blue Button	Triggers processed recording
Red LED	Indicates raw recording status
Blue LED	Indicates processed recording status

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System Workflow

1. Capture: MAX4466 microphone picks up sound.
2. Amplify & Filter: Analog signal is boosted and high-frequency noise reduced.
3. Digitize: STM32 ADC converts analog signal to digital.
4. Process:
   • Biquad Filter for frequency shaping
   • Kalman Filter for noise reduction and smoothing
5. Transmit: Processed and/or raw data sent via USB to PC.
6. Visualize & Listen: Real-time plotting and audio playback on the computer.

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