audio_feature_extraction.json

{
    "feature_extraction": {
        "sequence": [
            {
                "operation": {
                    "name": "audio_decoder",
                    "type": "AudioDecoder"
                }
            },
            {
                "operation": {
                    "name": "gemma4_log_mel",
                    "type": "Gemma4LogMel",
                    "attrs": {
                        "feature_size": 128,
                        "sampling_rate": 16000,
                        "frame_length_ms": 20.0,
                        "hop_length_ms": 10.0,
                        "min_frequency": 0.0,
                        "max_frequency": 8000.0,
                        "preemphasis": 0.0,
                        "preemphasis_htk_flavor": 1,
                        "fft_overdrive": 0,
                        "mel_floor": 0.001
                    }
                }
            }
        ]
    }
}