Research Article
Developing an Appropriate Digital Hearing Aid for Low-Resource Countries: A Case Study
Table 7
Electroacoustics of the commercial-ready version.
| Electroacoustics (IEC 60118-7) | Commercial-ready version |
| Max OSPL90 118 dB (±4 dB) | 125 dB | OSPL90 @ 1 KHz 114 dB (±4 dB) | 118 dB | Max FOG 45–55 dB (+5 dB) | 71 dB | FOG @ 1 KHz 42 dB (+5 dB) | 62 dB @ 50 dB | Basic frequency response 200–4500 Hz | 380–4400 Hz | THD @ 70 dB SPL input 500 Hz < 5%, 800 Hz < 5%, 160 Hz < 2% | 0.3%, 3.8%, 0.4% | Equivalent input noise level <25 dB SPL | 25 dB | Battery current < 1 mA | 11.8 mA (rechargeable) |
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