Dspx – Native C++ DSP Library for Node.js Built for AWS Lambda (1.3MB)

Show HN: Dspx – Native C++ DSP Library for Node.js Built for AWS Lambda (1.3MB)

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This grew out of a project called Myovine — a BLE EMG armband that streams 2 kHz × 8 channels to a mobile app for real-time muscle activity analysis. The signal processing ran on Lambda, which meant SciPy was immediately out (60–90MB package, 250MB unzipped limit). Existing JS options either had no concept of serializing filter state across invocations or weren't fast enough for the throughput requirements. So I built dspx around three constraints: small enough to deploy on Lambda, fast enough to matter (105M samples/sec on arm64), and stateful enough to resume — full pipeline state serializes to ElastiCache in 0.008ms binary. The harder problem turned out to be irregular timestamps. BLE jit

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Website: a-kgeorge.me/projects/dspxBenchmark