Hearing prosthesis with accessory detection

1. An apparatus comprising:

one or more microphones configured to generate microphone signals based on received acoustic signals;

an accessory interface configured to receive accessory signals from an accessory associated with the hearing prosthesis, wherein the accessory interface is separate from the one or more microphones;

a detector circuit configured to determine whether an accessory signal received from the accessory includes audio data and to determine the accessory signal type;

an audio processing circuit configured to:

in response to a determination that the accessory signal received from the accessory includes audio data, operate in an accessory mode to generate an output signal based at least in part on the accessory signal received from the accessory, wherein the operations performed in the accessory mode are based at least in part on the determined accessory signal type, and

in response to a determination that the accessory signal received from the accessory does not include audio data, operate in a microphone mode to generate an output signal based only on microphone signals received via the one or more microphones; and

an alert generation circuit configured to generate an error indication in response to the detector circuit determining that the accessory signal received from the accessory does not include audio data.

2. The apparatus of claim 1 , wherein the one or more microphones and the at least one accessory interface are connected to different parts of the audio processing circuit such that the accessory signals bypass one or more portions of the audio processing circuit that process the microphone signals.

3. The apparatus of claim 1 , wherein in the accessory mode, the audio processing circuit is configured to combine the accessory signal with any microphone signals received from the one or more microphones, and wherein at least one of an amplification or attenuation used to combine the accessory signal with any microphone signals is based on the determined accessory signal type.

4. The apparatus of claim 1 , wherein in the accessory mode, the audio processing circuit is configured to attenuate any microphone signals received from the one or more microphones.

5. The apparatus of claim 1 , wherein the detector circuit is configured to detect a physical connection of the accessory with the hearing prosthesis, and wherein the alert generation circuit is configured to generate the error indication in response to the detector circuit detecting the physical connection and determining that the input signal does not include the audio data.

6. The apparatus of claim 1 , wherein the alert generation circuit is configured to generate, in response to the detector circuit determining that the accessory signal received from the accessory does include the audio data, an indication that the accessory is functioning correctly.

7. The apparatus of claim 1 , wherein the detector circuit is configured to measure a signal level of the accessory signal, time average the measured signal level, and compare the time average with a threshold level for detecting data corresponding to the audio data.

8. The apparatus of claim 1 , wherein the audio processing circuit comprises at least one amplifier and a digital signal processor (DSP), and wherein the at least one amplifier and the DSP each operate in a first mode of operation when in the accessory mode and in a second mode of operation when in the microphone mode, wherein the second modes are different from the first modes.

9. The apparatus of claim 1 , wherein the error indication is at least one of a visual indication or an audible indication.

10. The apparatus of claim 1 , wherein the audio processing circuit further includes:

a first automatic sensitivity control (ASC) configured to receive a microphone input signal from a microphone;

a mixer coupled to an output of the first ASC and to an accessory input, wherein the accessory input is configured to receive the input signal from the accessory; and

a second ASC coupled to an output of the mixer,

and wherein the audio processing circuit is configured to generate the output signal based at least in part on an output signal from the second ASC.

11. A method performed at a hearing prosthesis comprising one or more microphones and an accessory interface that is separate from the one or more microphones, comprising:

receiving, via the accessory interface, an accessory signal from an accessory that is associated with the hearing prosthesis;

determining whether the accessory signal received from the accessory associated with the hearing prosthesis includes audio data;

when the accessory signal received includes audio data, determining the accessory signal type;

in response to determining that the accessory signal received from the accessory includes audio data, operating an audio processing circuit of the hearing prosthesis in an accessory mode to generate an output signal based at least in part on the accessory signal received from the accessory, wherein the operations performed in the accessory mode are based at least in part on the determined accessory signal type;

in response to a determination that the accessory signal received from the accessory does not include audio data, operating the audio processing circuit in a microphone mode to generate an output signal based only on microphone signals received via the one or more microphones; and

generating an error indication in response to determining that the accessory signal received from the accessory does not include the audio data.

12. The method of claim 11 , wherein the one or more microphones and the at least one accessory interface are connected to different parts of the audio processing circuit such that the accessory signals bypass one or more portions of the audio processing circuit that process the microphone signals.

13. The method of claim 11 , wherein operating the audio processing circuit in the accessory mode comprises:

combining the accessory signal with any microphone signals received from the one or more microphones, wherein at least one of an amplification or attenuation used to combine the accessory signal with any microphone signals is based on the determined accessory signal type.

14. The method of claim 11 , wherein operating the audio processing circuit in the accessory mode comprises:

attenuating any microphone signals received from the one or more microphones.

15. The method of claim 11 , further comprising:

generating, in response to determining that the accessory signal received from the accessory does include the audio data, an indication that the accessory is functioning correctly.

16. The method of claim 11 , wherein determining whether the accessory signal includes the audio data further includes measuring a signal level of the accessory signal, time averaging the measured signal level, and comparing the time average with a threshold level.

17. The method of claim 11 , wherein the audio processing circuit comprises at least one amplifier and a digital signal processor (DSP), and wherein the at least one amplifier and the DSP each operate in a first mode of operation when in the accessory mode and in a second mode of operation when in the microphone mode, wherein the second modes are different from the first modes.

18. The method of claim 11 , wherein the error indication is at least one of a visual indication or an audible indication.

19. The method of claim 18 , wherein the error indication is provided by a device separate from the hearing prosthesis.