goatman/dtln-aec-256-coreml

DTLN-aec 256 (CoreML)

Stateful CoreML conversion of the 256-unit DTLN-aec acoustic echo canceller, for on-device real-time echo cancellation in Narrato on Apple Silicon (macOS 14.4+).

• Source model: breizhn/DTLN-aec (dtln_aec_256_{1,2}.tflite), MIT licensed. Original work © Nils L. Westhausen.
• Conversion: tflite → onnx → torch → CoreML (see Narrato's scripts/convert_dtln_aec_coreml.py). Validated faithful to the original TFLite (RMS ~4e-4 through the full run_aec framing).

Contents

• dtln_aec_256_1.mlpackage — stage 1 (magnitude domain).
• dtln_aec_256_2.mlpackage — stage 2 (time domain).
• contract.json — I/O + framing contract (block 512, hop 128, 257 bins, state [1,2,256,2]).

16 kHz mono. Two stages with an explicit LSTM state tensor carried frame-to-frame.