| 摘要 |
<p>The disclosure describes a hearing aid, a detection device for finding the hearing aid when lost, and to a hearing aid system comprising a hearing aid and a detection device. The hearing aid comprises, an input transducer, e.g. a microphone, an audiological signal processing unit and a receiver. The microphone and the receiver are operatively connected to the audiological signal processing unit that is configured to process a sound-representing electrical signal provided by the microphone and to generate an output signal that can be transformed into sound by means of the receiver. The hearing aid further comprises a control unit and an antenna circuit that are part of a wireless unit for wireless transmission and/or reception of electromagnetic signals. The antenna circuit comprises a capacitance and an inductance that together define a resonance frequency of the antenna circuit. The hearing aid further comprises a dissipative resistance and a switch. The dissipative resistance and the switch are arranged to allow selective coupling or decoupling of the dissipative resistance to or from, respectively, the antenna circuit to thus allow controlling of the dissipative properties of the antenna circuit by means of the switch. If the dissipative resistance is coupled with or connected to the antenna circuit, it dissipates some of the energy of the antenna circuit. If the dissipative resistance is decoupled or disconnected from the antenna circuit, the dissipative resistance is ineffective. The switch allows for selective coupling or decoupling of the resistance to the antenna circuit.</p> |
