| 摘要 |
A time-duplex wireless telephone for reducing magnetic coupling between the wireless telephone and a hearing aid to prevent hum pick-up in the hearing aid. The wireless telephone includes a battery, a rad io circuit, and a humbucking coil. The radio circuit is connected to the battery and has a transmit mode where transmit signals are transmitte d and a receive mode where received signals are received. The radio circuit intermittently is switched between the transmit mode and t he receive mode. The radio circuit generates a transmission magnetic field when the radio circuit is transmitting transmit signals. A humbucking coil is connected in the radio circuit to generate a cancellation magnetic field that is directly proportional to the transmissio n magnetic field and in antiphase with the transmission magnetic field. The cancellation magnetic field at least partially cancels the transmission magnetic field and reduces magnetic coupling between the wireless telephone and a hearing aid used in conjunction with the wireless telephone.
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