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See comment here: https://codereview.webrtc.org/1208993010/diff/180001/webrtc/modules/audio_coding/codecs/isac/audio_encoder_isac_t_impl.h#newcode189 TBR=minyue@webrtc.org Review URL: https://codereview.webrtc.org/1315333003 Cr-Commit-Position: refs/heads/master@{#9800}