Time-duplex wireless telephone with improved hearing-aid...

H - Electricity – 04 – M

Patent

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Details

H04M 1/74 (2006.01) H04B 15/00 (2006.01) H04L 5/14 (2006.01) H04B 1/56 (2006.01)

Patent

CA 2243210

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 radio circuit, and a humbucking coil. The radio circuit is connected to the battery and has a transmit mode where transmit signals are transmitted and a receive mode where received signals are received. The radio circuit intermittently is switched between the transmit mode and the 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 transmission 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.

Téléphone sans fil duplexé dans le temps réduisant le couplage magnétique entre un téléphone sans fil et un appareil auditif afin d'éviter la présence d'un ronflement dans l'appareil auditif. Le téléphone sans fil comporte une batterie, un circuit radio et une bobine d'effacement de ronflement. Le circuit radio est relié à la batterie et possède un mode émission, dans lequel des signaux d'émission sont émis, et un mode réception, dans lequel des signaux de réception sont reçus. Le circuit radio alterne de façon intermittente entre le mode émission et le mode réception. Le circuit radio génère un champ magnétique d'émission lorsque le circuit radio émet des signaux d'émission. Une bobine d'effacement de ronflement reliée au circuit radio produit un champ magnétique d'annulation directement proportionnel au champ magnétique d'émission, en opposition de phase avec le champ magnétique d'émission. Le champ magnétique d'annulation annule au moins partiellement le champ magnétique d'émission et réduit le couplage magnétique entre le téléphone sans fil et l'appareil auditif utilisé en association avec le téléphone sans fil.

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