/en/tags/cmsis-dsp/Recent content in CMSIS-DSP on Mi&Bee BlogHugo -- gohugo.ioen蓝宝石的傻话Mon, 18 May 2026 10:00:00 +0800/en/posts/physical-world/embedded-anc-stm32/Mon, 18 May 2026 10:00:00 +0800/en/posts/physical-world/embedded-anc-stm32/<h2 id="hardware-architecture">Hardware Architecture</h2> <p>Implementing real-time ANC begins with selecting the right hardware platform. The controller must complete adaptive filtering within microseconds while managing multiple audio data streams.</p> <table> <thead> <tr> <th>Module</th> <th>Function</th> <th>Typical Choice</th> </tr> </thead> <tbody> <tr> <td>Main Controller</td> <td>Executes adaptive algorithm</td> <td>STM32F4/F7, ESP32-S3, nRF5340</td> </tr> <tr> <td>Reference Mic</td> <td>Captures ambient noise</td> <td>Knowles SPH0645, Infineon IM69D130</td> </tr> <tr> <td>Error Mic</td> <td>Captures residual noise</td> <td>Knowles SPH0645, TDK ICS-43434</td> </tr> <tr> <td>Audio DAC</td> <td>Outputs anti-noise signal</td> <td>ES9218, PCM5102</td> </tr> <tr> <td>Amplifier</td> <td>Drives speaker</td> <td>Class-D</td> </tr> </tbody> </table> <p>The reference microphone sits outside the earcup and captures external ambient noise as the algorithm&rsquo;s reference input. The error microphone sits inside the earcup near the speaker, capturing residual noise for evaluating cancellation performance and driving adaptive updates. The audio DAC converts the digital anti-noise signal to analog, which is amplified by a Class-D amplifier to drive the speaker.</p>