MetricGAN+: An Improved Version of MetricGAN for Speech Enhancement

8 Apr 2021  ·  Szu-Wei Fu, Cheng Yu, Tsun-An Hsieh, Peter Plantinga, Mirco Ravanelli, Xugang Lu, Yu Tsao ·

The discrepancy between the cost function used for training a speech enhancement model and human auditory perception usually makes the quality of enhanced speech unsatisfactory. Objective evaluation metrics which consider human perception can hence serve as a bridge to reduce the gap. Our previously proposed MetricGAN was designed to optimize objective metrics by connecting the metric with a discriminator. Because only the scores of the target evaluation functions are needed during training, the metrics can even be non-differentiable. In this study, we propose a MetricGAN+ in which three training techniques incorporating domain-knowledge of speech processing are proposed. With these techniques, experimental results on the VoiceBank-DEMAND dataset show that MetricGAN+ can increase PESQ score by 0.3 compared to the previous MetricGAN and achieve state-of-the-art results (PESQ score = 3.15).

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Task Dataset Model Metric Name Metric Value Global Rank Benchmark
Speech Enhancement VoiceBank + DEMAND MetricGAN+ PESQ 3.15 # 11
CSIG 4.14 # 17
CBAK 3.16 # 17
COVL 3.64 # 14


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