DSP Labs
  • INTRODUCTION
  • BILL OF MATERIALS
  • 1. OVERVIEW AND INSTALLATION
    • 1.1 Hardware
    • 1.2 Software
      • CubeMX
      • SW4STM32
      • Eclipse tips
    • 1.3 First project!
  • 2. AUDIO PASSTHROUGH
    • 2.1 Audio I/O theory
      • Microphone
      • Stereo decoder
    • 2.2 Updating peripherals
    • 2.3 Wiring audio I/O
    • 2.4 Coding passthrough
  • 3. ALIEN VOICE EFFECT
    • 3.1 How it works
    • 3.2 Real-time DSP tips
    • 3.3 Real-time with Python
    • 3.4 C implementation
  • 4. DIGITAL FILTER DESIGN
    • 4.1 Design approaches
    • 4.2 Real-time implementation
  • 5. GRANULAR SYNTHESIS
    • 5.1 How it works
    • 5.2 Implementation
  • 6. LINEAR PREDICTION
    • 6.1 Theory behind LPC
    • 6.2 Implementation
  • 7. DFT PITCH SHIFTING
    • 7.1 How it works
    • 7.2 Python implementation
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2. AUDIO PASSTHROUGH

Previous1.3 First project!Next2.1 Audio I/O theory

Last updated 6 years ago

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A "passthrough" can be viewed as the audio equivalent of "hello world". In this chapter, we will build a passthrough with the hardware and software components previously introduced. Moreover, we will point out some key specifications from the microphone and the DAC (Digital-to-Analog Converter) components so that our STM32 board can successfully interface with them. This will be done in Section 2.1.

Using the CubeMX software, we will update the configuration of the microcontroller in Section 2.2. We will guide you through the wiring in Section 2.3. Finally, we will program our passthrough in Section 2.4 using the SW4STM32 software.

Highlighted boxes, as shown below, specify a task for you to determine the appropriate solution and implementation.

TASK: This is a task for you!

A passthrough is a great sanity check when first beginning with an audio DSP system. Moreover, it serves as a useful starting point for new projects as we will see in the following chapters when we develop more complicated programs!

Figure: Final wiring.