In a transmission apparatus for transmitting signals to a hearing device,
as well as transmission and operating methods thereof, and a hearing aid
apparatus, not only the acoustic path but also an electromagnetic path
are used to transmit the same signal. So that the data rate can be
reduced for low power consumption, only the envelope of the useful signal
is transmitted electromagnetically. This allows a useful signal to be
transmitted from one hearing device to another hearing device
electromagnetically with low power consumption. The reception-end hearing
device then restores the source signal, containing interference, with the
electromagnetically transmitted envelope to produce an output signal.