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Table 2 Lossy compression results

From: Compression of high-density EMG signals for trapezius and gastrocnemius muscles

Method Mus. Arr. Var. MVC
     10% 20% 30% 40% 50% 60% 70% 80%
ACELP BB L FSR (%) 87.3   87.3    87.3 87.3  
[10]    SNR (dB) 10.38   11.81    12.25 12.79  
JPEG UT L FSR (%)   87.5 ± 0.5   87.1 ± 0.4     
    SNR (dB)   17.17 ± 0.74   18.63 ± 0.86     
    MAE (A.U.)   134.7 ± 10.4   168.0 ± 13.8     
    q   15   10     
JPEG UT T FSR (%)   87.3 ± 0.4   87.2 ± 0.4     
    SNR (dB)   19.15 ± 0.78   20.45 ± 0.80     
    MAE (A.U.)   109.3 ± 10.5   147.3 ± 22.8     
    q   19   13     
JPEG MG L FSR (%)   87.3 ± 0.6   87.3 ± 0.4   87.3 ± 0.3   87.3 ± 0.4
    SNR (dB)   19.48 ± 0.42   19.98 ± 0.49   21.88 ± 0.59   23.33 ± 0.84
    MAE (A.U.)   25.4 ± 1.7   43.9 ± 5.7   63.0 ± 6.6   78.5 ± 5.4
    q   71   47   31   24
JPEG MG T FSR (%)   87.3 ± 0.5   87.3 ± 0.3   87.3 ± 0.3   87.2 ± 0.5
    SNR (dB)   19.92 ± 0.37   20.99 ± 0.50   22.95 ± 0.58   24.24 ± 0.85
    MAE (A.U.)   21.4 ± 2.2   35.9 ± 2.0   51.8 ± 4.6   62.0 ± 5.3
    q   73   52   34   26
IC [25] BB L FSR (%)      89.6    
    SNR (dB)      15.58    
JPEG UT L FSR (%)   89.6 ± 0.4   89.5 ± 0.4     
    SNR (dB)   15.81 ± 0.72   17.17 ± 0.87     
    MAE (A.U.)   160.5 ± 13.6   189.5 ± 17.8     
    q   10   06     
JPEG UT T FSR (%)   89.5 ± 0.4   89.6 ± 0.4     
    SNR (dB)   17.66 ± 0.75   18.87 ± 0.82     
    MAE (A.U.)   129.4 ± 12.7   170.0 ± 26.1     
    q   13   08     
JPEG MG L FSR (%)   89.6 ± 0.5   89.5 ± 0.3   89.7 ± 0.3   89.5 ± 0.4
    SNR (dB)   17.84 ± 0.42   18.39 ± 0.49   20.09 ± 0.58   21.63 ± 0.83
    MAE (A.U.)   30.8 ± 2.3   60.0 ± 7.2   78.3 ± 8.5   94.6 ± 8.3
    q   57   32   20   16
JPEG MG T FSR (%)   89.6 ± 0.4   89.6 ± 0.3   89.7 ± 0.3   89.5 ± 0.4
    SNR (dB)   18.37 ± 0.37   19.39 ± 0.50   21.14 ± 0.55   22.36 ± 0.83
    MAE (A.U.)   26.4 ± 2.0   39.6 ± 1.6   67.5 ± 5.7   75.4 ± 6.8
    q   60   35   22   17
SP [25] BB   FSR (%)      91.0    
    SNR (dB)      15.55    
STP[25] BB   FSR (%)      91.0    
    SNR (dB)      18.96    
JPEG UT L FSR (%)   91.1 ± 0.4   90.9 ± 0.4     
    SNR (dB)   14.72 ± 0.71   15.94 ± 0.87     
    MAE (A.U.)   176.7 ± 13.8   212.2 ± 12.9     
    q   7   4     
JPEG UT T FSR (%)   91.2 ± 0.4   90.8 ± 0.4     
    SNR (dB)   16.44 ± 0.75   17.94 ± 0.83     
    MAE (A.U.)   148.6 ± 12.6   179.5 ± 19.0     
    q   9   6     
JPEG MG L FSR (%)   91.0 ± 0.5   91.0 ± 0.3   91.1 ± 0.3   90.9 ± 0.4
    SNR (dB)   16.74 ± 0.42   17.23 ± 0.48   18.92 ± 0.59   20.39 ± 0.83
    MAE (A.U.)   38.4 ± 3.9   61.0 ± 4.1   91.0 ± 9.8   113.5 ± 10.3
    q   44   24   15   12
JPEG MG T FSR (%)   91.0 ± 0.4   90.9 ± 0.3   90.9 ± 0.3   90.8 ± 0.4
    SNR (dB)   17.34 ± 0.37   18.34 ± 0.49   20.03 ± 0.55   21.19 ± 0.82
    MAE (A.U.)   30.3 ± 3.2   48.5 ± 3.0   70.5 ± 5.4   83.4 ± 4.8
    q   48   27   17   13
  1. File size reduction (FSR), signal-to-noise ratio (SNR), maximum absolute error (MAE) and quality (q) for lossy compression. Literature values reported in [10] are shown for biceps brachii (BB). Mean values ± standard deviation were computed for 40 epochs per contraction level (% of MVC) of upper trapezius (UT) signals and for 8 epochs per contraction level (% of MVC) of medial gastrocnemius (MG) signals. Arrangements were longitudinal (L) and transversal (T).