DIRECT DIGITAL AUDIO ADAPTER FOR HEARING AIDS
An apparatus for sending a second digital audio signal to a hearing aid and has a power supply and an induction loop for sending an alternating magnetic field. The apparatus also has a controller which is galvanically, capacitively or inductively connected to the induction loop. Here the controller is configured to convert an incoming first audio signal into the second digital audio signal, and using the second digital audio signal to create a control signal for sending the second digital audio signal by use of the induction loop.
1 . An apparatus for sending a second digital audio signal to a hearing aid, the apparatus comprising:
a power supply;
an induction loop for sending an alternating magnetic field;
a controller being galvanically, capacitively or inductively connected to said induction loop, said controller configured to convert an incoming first audio signal into the second digital audio signal and configured to use the second digital audio signal to generate a further signal to send the second digital audio signal by means of said induction loop; and
said power supply configured to draw power needed to generate the further signal from the first audio signal.
2 . The apparatus according to claim 1 , wherein said controller has a monitoring device configured to monitor a level of the first audio signal in a predefined frequency range and to suppress a creation of the further signal if a predetermined threshold value of the level is not reached.
3 . The apparatus according to claim 1 , further comprising means configured so as to decode encoded control instructions in the first audio signal.
4 . A system for sending a second digital audio signal to a hearing aid, the system comprising:
an apparatus, containing:
a power supply;
an induction loop for sending an alternating magnetic field;
a controller being galvanically, capacitively or inductively connected to said induction loop, said controller configured to convert an incoming first audio signal into the second digital audio signal and configured to use the second digital audio signal to generate a further signal to send the second digital audio signal by means of said induction loop;
said power supply configured to draw power needed to generate the further signal from the first audio signal; and
an audio signal source generating the first audio signal from an audio signal to be transferred and from a third signal, the third signal being suitable for ensuring said apparatus has sufficient power for sending by means of said power supply and wherein the third signal does not result in any audible noise for a person wearing the hearing aid.
5 . The system according to claim 4 , wherein the third signal is an electrical DC signal.
6 . The system according to claim 4 , wherein the third signal is an audio signal in a frequency range that is imperceptible to a person wearing the hearing aid.
7 . The system according to claim 4 , wherein said audio signal source configured to encode in the third signal control commands for said apparatus for sending.