espnet2.enh.layers.bsrnn.get_erb_subbands

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espnet2.enh.layers.bsrnn.get_erb_subbands(input_dim, min_freq_idx=0, n_erbs=64, target_fs=48000)

Get Equivalent Rectangular Bandwidth (ERB) division of subbands.

Reference: : https://github.com/Xiaobin-Rong/gtcrn/blob/main/stream/gtcrn.py#L11-L49

• Parameters:
  • input_dim (int) – number of frequency bins corresponding to target_fs Assumed to be n_fft // 2 + 1, where n_fft is the FFT size.
  • min_freq_idx (int) – bin index of the minimum frequency to start the ERB bands. Frequency bins below this value will be kept as is. min_freq_idx / input_dim * target_fs / 2 is the minimum frequency in Hz.
  • n_erbs (int) – number of ERB frequency bands to be used.
  • target_fs (int) – target sampling frequency in Hz.
• Returns: a tuple of overlapping subbands (start and end indices) : len(subbands) = min_freq_idx + n_erbs
• Return type: subbands (tuple)