An audio coupler device for communication with a T-coil in a hearing aid is described
to fit inside the receiver section of a handset as defined. The coupler device
is so mounted inside the receiver section as to provide strong inductive coupling
with a T-coil inside the hearing aid to deliver audio signals from the handset
to the person wearing the hearing aid. The coupler device has a coil and a magnetic
core that is preferably formed of a ferromagnetic material and a capacitor is placed
in series with the coil. The coupler device in turn is connected in series with
the speaker so as to reduce loading of circuitry inside the handset and driving
the speaker. The coupler device can be mounted in many different handset devices
and is preferably mounted to concentrate an audio inductive field at the T-coil
in a hearing aid worn by a person using the handset device.
