def METHOD_NAME(self, block_index, seg_index, i_start, i_stop,
                            stream_index, channel_indexes):
    stream_id = self.header['signal_streams'][stream_index]['id']
    global_channel_indexes, = np.nonzero(self.header['signal_channels']
                                ['stream_id'] == stream_id)
    if channel_indexes is None:
        channel_indexes = slice(None)
    inds = global_channel_indexes[channel_indexes]
    raw_signals = self._raw_signals[seg_index][slice(i_start, i_stop), inds]
    return raw_signals