Hearing aid system comprising a receiver in the ear and a system for identification of the type of receiver
A hearing aid system may include a behind-the-ear (BTE) part configured to be located at an ear of a user, an in-the-ear (ITE) part configured to be located in an ear canal of a user, and a measurement circuit. The ITE part may include a receiver for converting an electric output signal having frequencies in the human audible frequency range to an output sound, and a resistive identification element. The measurement circuit is configured to measure an identification parameter indicative of the resistance of the resistive identification element, thus identifying the ITE part. The measurement circuit uses the same electric output signal that is driving the receiver to determine the identification parameter. Advantageously, this approach does not require an additional signal, such as DC voltage, to determine the identification parameter.
1. A hearing aid system comprising
a BTE-part adapted for being located at an ear of a user and
an ITE-part adapted to be located in an ear canal of a user, the ITE-part comprising
a receiver for converting an electric output signal comprising frequencies in the human audible frequency range to an output sound,
the ITE-part further comprising a resistive ID-element,
the hearing aid system comprising a measurement circuit for measuring an ID-parameter indicative of the resistance of said resistive ID-element, wherein
said measurement circuit is adapted to use said electric output signal to determine said ID-parameter.
2. A hearing aid system according to claim 1 wherein the measurement circuit comprises a level detecting element.
3. A hearing aid system according to claim 1 wherein the measurement circuit comprises a high frequency level detecting element.
4. A hearing aid system according to claim 1 wherein the measurement circuit comprises a diode.
5. A hearing aid system according to claim 1 wherein the measurement circuit comprises a diode in series with said resistive ID-element.
6. A hearing aid system according to claim 1 wherein the electric output signal is a difference signal.
7. A hearing aid system according to claim 1 wherein the measurement circuit comprises a voltage measurement unit for measuring a voltage related to the resistance of said resistive ID-element.
8. A hearing aid system according to claim 1 wherein the measurement circuit comprises a resistive reference element.
9. A hearing aid system according to claim 8 wherein the measurement circuit comprises a capacitor in parallel with said resistive reference element.
10. A hearing aid system according to claim 1 wherein the resistance of said resistive ID-element is indicative of the type of said receiver.
11. A method of identifying a type of receiver in an hearing aid system, the hearing aid system comprising a BTE-part adapted for being located at an ear of a user and an ITE-part adapted to be located in an ear canal of a user, the ITE-part comprising a receiver for converting an electric output signal comprising frequencies in the human audible frequency range to an output sound, the ITE-part further comprising a resistive ID-element, the method comprising
measuring an ID-parameter indicative of the resistance of said resistive ID-element,
using said electric output signal to determine said ID-parameter.
12. A method according to claim 11 wherein the electric output signal is a difference signal.
13. A method according to claim 11 wherein the measurement is performed based on a predefined sound input.
14. A method according to claim 11 wherein the signal processor is adapted to provide a specific electric output signal, which is suitable for performing the measurement of the ID-parameter.