Table 2
Model configurations and numeric results. Middle ear: Details of frequency response of the middle-ear filters. Cochlear filter bank: 40 dB and 100 dB refer to filter characteristics between 160 and 8000 Hz in response to white noises of 40 and 100 dB SPL, respectively. IHC: Parameters and frequency response of the LP filter structures. Subcortical processing: Theoretical and estimated BMF of the modulation filter with the closest BMF to 100 Hz and peak-to-peak amplitude of the simulated IC outputs in response to 70-dB-peSPL clicks of positive (A) and negative (−A) (see Sect. 4.4 for more details). Performance: Time required to process a 1-s long stimulus using each of the selected auditory models, between Stages 1 and 6 (Fig. 2). All fcut-off in this table were measured at the −3 dB points of the amplitude spectrum.
| Stage | Model |
|||||||
|---|---|---|---|---|---|---|---|---|
| Parameter | dau1997 | zilany2014 | verhulst2015 | verhulst2018 | bruce2018 | king2019 | relanoiborra2019 | osses2021 |
| Middle ear | ||||||||
| Passband gain in Fig. 3 (dB) | – | −6.0 | 24.0 | 18.0 | −6.0 | – | −66.9 | 0.00 |
| Lower fcut-off (Hz) | – | 577.6 | 601.0 | 601.1 | 577.6 | – | 474.8 | 474.8 |
| Higher fcut-off (Hz) | – | 6061.9 | 2995.3 | 3993.1 | 6061.9 | – | 1230.2 | 1230.2 |
| Cochlear filter bank | ||||||||
| Reference gain in Figs. 4–5 (dB) | −0.6 | −44.1 | −77.9 | −101.9 | −44.1 | −43.9 | 26.9 | −1.9 |
| 40 dB: Number of filters | 34 | 51 | 59 | 52 | 51 | 34 | 36 | 34 |
| 40 dB: Average filter bandwidth (ERB) | 0.903 | 0.588 | 0.505 | 0.579 | 0.588 | 0.904 | 0.848 | 0.905 |
| 100 dB: Number of filters | 34 | 20 | 12 | 15 | 20 | 33 | 27 | 34 |
| 100 dB: Average filter bandwidth (ERB) | 0.903 | 1.57 | 3.046 | 2.299 | 1.57 | 0.925 | 1.147 | 0.905 |
| IHC | ||||||||
| Number of filter sections | 1 | 7 | 1 | – | 7 | 1 | 1 | 5 |
| Order of each filter section | 1 | 1 | 2 | – | 1 | 1 | 2 | 1 |
| fcut-off of each filter section (Hz) | 1000 | 3000 | 1000 | – | 3000 | 1000 | 1000 | 2000 |
| fcut-off of the total filter structure (Hz) | 1000 | 966 | 642 | – | 966 | 1000 | 1000 | 771 |
| Subcortical processing | ||||||||
| Theoretical BMF (Hz) | 77.2 | 85.4 | 82.4 | 82.4 | 85.4 | 94.0 | 77.2 | 77.2 |
| Estimated BMF from Fig. 14a (Hz) | 70 | 35 | 45 | 60 | 45 | 65 | 70 | 70 |
| Unit of the amplitude | MU | spikes/s | μV | μV | spikes/s | a.u. | MU | MU |
| Click of amplitude A | 407.3 | 116.5 | 0.245 | 0.401 | 117.6 | 1.64 · 10−4 | 423.1 | 155.9 |
| Click of amplitude −A | 437.4 | 115.8 | 0.237 | 0.407 | 117.3 | 1.67 · 10−4 | 408.9 | 157.3 |
| Performance | ||||||||
| Total time (s) | 0.80 | 86.6 | 122.9 | 319.5 | 163.1 | 1.86 | 7.70 | 0.622 |
| Number of cochlear channels | 31 | 66 | 401 | 401 | 66 | 31 | 60 | 31 |
| Time per channel (s) | 0.026 | 1.31 | 0.306 | 0.797 | 2.47 | 0.060 | 0.128 | 0.020 |
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