Table 6.
Comparison of the compression ratio, peak signal-to-noise ratios (PSNR), and structural similarity (SSIM) index between the original and processed acoustic sensor signals for the proposed method.
| Sensor | Proposed Method |
Bit-Depth Reduction
(from 16 to 8 bits) |
||||
| Compression Ratio (%) |
PSNR
(dB) |
SSIM | Compression Ratio (%) |
PSNR
(dB) |
SSIM | |
| #4 | 57.01 | 43.81 | 0.9995 | 50.00 | 20.33 | 0.0663 |
| #5 | 59.74 | 49.73 | 0.9994 | 50.00 | 26.04 | 0.6909 |
| #6 | 66.13 | 50.69 | 0.9998 | 50.00 | 20.60 | 0.8520 |
| #7 | 68.39 | 69.27 | 0.9998 | 50.00 | 30.60 | 0.8950 |
| #8 | 63.44 | 50.58 | 0.9996 | 50.00 | 24.11 | 0.7283 |
| Avg. | 62.94 | 58.17 | 0.9996 | 50.00 | 25.21 | 0.6465 |
| Sensor |
SHORTEN
(Lossy Mode: Max. 9 Bits per Sample) |
SHORTEN
(Lossy Mode: Max. 10 Bits per Sample) |
||||
| Compression Ratio (%) |
PSNR
(dB) |
SSIM | Compression Ratio (%) |
PSNR
(dB) |
SSIM | |
| #4 | 56.46 | 58.81 | 0.9987 | 61.66 | 67.33 | 0.9997 |
| #5 | 56.74 | 45.88 | 0.9987 | 62.92 | 49.84 | 0.9994 |
| #6 | 56.67 | 49.51 | 0.9989 | 62.92 | 48.48 | 0.9993 |
| #7 | 56.74 | 54.58 | 0.9988 | 62.99 | 58.17 | 0.9995 |
| #8 | 56.70 | 52.92 | 0.9985 | 61.64 | 61.72 | 0.9994 |
| Avg. | 56.66 | 53.43 | 0.9987 | 62.42 | 59.88 | 0.9995 |