Clean Speech

Noisy Speech

Four noise types artificially added.

• car
  

• engine
  

• street noise
  

• background talkers
  

Speech Generation

Generating speech with EPG signals only

Generating speech with EPG signals and noisy speech signals in early fusion mode

Generating speech with EPG signals and noisy speech signals in late fusion mode

Speech Enhancement

Using audio signal only

• car
  

• engine
  

• street noise
  

• background talkers
  

Combining EPG and audio signal in early fusion

• car
  

• engine
  

• street noise
  

• background talkers
  

Combining EPG and audio signal in late fusion

• car
  

• engine
  

• street noise
  

• background talkers
  

Appendix

• Appendix I. Comparison of different speech enhancement approach (p-value)

	Noisy - Baseline	Baseline - EF	Baseline - LF	EF - LF
PESQ	0.000	0.000	0.007	0.189
STOI	0.000	0.000	0.000	0.842
ESTOI	0.000	0.000	0.000	0.585
MCD	0.000	0.000	0.000	0.000
SSNR	0.000	0.061	0.000	0.073

• Appendix II. Comparison of noisy speech and baseleine in speech enhancement at SNR levels (p-values)

	PESQ	STOI	ESTOI	MCD	SSNR
10dB	0.000	0.000	0.000	0.000	0.000
5dB	0.000	0.000	0.000	0.000	0.000
0dB	0.000	0.000	0.000	0.000	0.000
-5dB	0.000	0.000	0.000	0.000	0.000
-10dB	0.000	0.000	0.000	0.000	0.000

• Appendix III. Comparison of EF and LF in speech enhancement at SNR levels (p-values)

	PESQ	STOI	ESTOI	MCD	SSNR
10dB	0.000	0.227	0.019	0.355	0.125
5dB	0.008	0.406	0.117	0.018	0.687
0dB	0.240	0.586	0.866	0.001	0.043
-5dB	0.909	0.758	0.118	0.000	0.001
-10dB	0.127	0.018	0.000	0.000	0.001