def _create_asr_frontend():
            """Parameters corresponding to default ASR frontend."""
            from lingvo.tasks.asr import frontend

            params = frontend.MelAsrFrontend.Params()
            # default params from Lingvo
            params.sample_rate = 16000.0
            params.frame_size_ms = 25.0
            params.frame_step_ms = 10.0
            params.num_bins = 80
            params.lower_edge_hertz = 125.0
            params.upper_edge_hertz = 7600.0
            params.preemph = 0.97
            params.noise_scale = 0.0
            params.pad_end = False
            # additional params from Qin et al.
            params.stack_left_context = 2
            params.frame_stride = 3
            return params.Instantiate()
Parameters corresponding to default ASR frontend.
art/estimators/speech_recognition/tensorflow_lingvo.py