STM32 Digital Guitar Effects Pedal
Project combining analog and digital signal processing techniques to create guitar effects in an embedded device.
Technical Implementation
This project involved designing a digital guitar effects pedal using an STM32 microcontroller. The system processes audio signals in real-time with various effects including distortion, delay, and reverb.
The hardware design includes analog input conditioning, digital signal processing, and analog output stages. The DSP algorithms were optimized for real-time performance on the STM32 platform.
The final product achieved professional-grade audio quality with latency under 1ms, making it suitable for live performances.
Audio Features
- Real-time audio processing with <1ms latency
- Multiple effect algorithms implemented in C
- Custom PCB design with proper grounding techniques
- I2S audio interface with 24-bit resolution
- USB configuration interface
Hardware Gallery
Front panel design
Internal components
Hardware Design
Overview Block Diagram
DSP Algorithms
Signal Processing Architecture
Key Audio Processing Innovations
- •Optimized FIR filters: Implemented using ARM CMSIS-DSP library with 90% CPU utilization efficiency
- •Delay effects: Circular buffer implementation with interpolation for smooth delay transitions
- •Distortion algorithms: Wave shaping with adjustable hardness parameters
- •Real-time performance: Achieved consistent 0.8ms latency through DMA and double-buffering
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