Time-duplex wireless telephone with improved hearing-aid compati

Details Time-duplex wireless telephone with improved hearing-aid compati Time-duplex wireless telephone with improved hearing-aid compati

1996-01-25

1998-11-24

Chin, Wellington

Telecommunications

Transmitter and receiver at same station

455 41, 455 66, 455570, H04Q 732

Patent

active

058421157

ABSTRACT:
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.

REFERENCES:
patent: 2989705 (1961-06-01), Romano et al.
patent: 3491216 (1970-01-01), Picchiottino
patent: 3624282 (1971-11-01), Salaman et al.
patent: 3674922 (1972-07-01), Salaman et al.
patent: 4588959 (1986-05-01), Herzog et al.
patent: 4596899 (1986-06-01), Wojcik et al.
patent: 5172410 (1992-12-01), Chace
patent: 5212829 (1993-05-01), Brinkhaus
patent: 5247704 (1993-09-01), Greenwood
patent: 5291541 (1994-03-01), Gibler et al.
patent: 5557673 (1996-09-01), Ginzburg

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