Wearable audio accessories for computing devices

1. A wearable, hands-free, head-free audio accessory for a host computing device, the audio accessory comprising:

a directional loudspeaker and a directional microphone which together are arranged to provide a speech based interface between a user and the host computing device for both user-initiated microtasks and host computing device initiated microtasks and wherein the directional loudspeaker is operative to provide notifications for the host computing device initiated microtasks;

an always-on audio sensing channel and a speech detection module arranged to work together to continuously monitor an audio signal detected by the directional microphone and to trigger a first higher level of audio processing based on a detected level of the audio signal and to trigger a second higher level of audio processing based on detection of a predefined keyword;

the always-on audio sensing channel and the speech detection module being further arranged to work together to control notifications to the user based at least in part on a determination that the user is having a conversation;

a wireless interface arranged to provide a communication link between the audio accessory and the host computing device;

an attachment mechanism arranged to attach the accessory to an item of clothing worn by the user; and

a sensor arrangement arranged to detect whether the accessory is attached to an object.

2. A wearable, hands-free, head-free audio accessory according to claim 1 , further comprising:

a power control mechanism arranged to control operation of the always-on audio sensing channel based on the output of the sensor arrangement.

3. A wearable, hands-free audio accessory according to claim 1 , wherein the sensor arrangement is further arranged to trigger a requirement for re-authentication between the audio accessory and the host computing device following detection of detachment of the audio accessory from the object.

4. A wearable, hands-free audio accessory according to claim 1 , further comprising an audio buffer arranged to provide a recording loop for the audio signal detected via the microphone to accommodate any latency associated with keyword detection.

5. A wearable, hands-free audio accessory according to claim 1 , wherein the speech based interface comprises an audio processing hierarchy comprising at least three levels.

6. A wearable, hands-free audio accessory according to claim 1 , wherein the wearable, hands-free audio accessory is arranged to output a delayed audio signal to a speech detection module located in the host device via the wireless interface.

7. A wearable, hands-free audio accessory according to claim 1 , wherein the audio accessory comprises two modes of operation, a first mode for performing microtasks and a second mode for extended tasks.

8. A wearable, hands-free audio accessory according to claim 1 , wherein the speech based interface is arranged to provide audible notifications to the user and wherein a notification is triggered by software running on the host computing device.

9. A wearable, hands-free audio accessory according to claim 8 , further comprising a physical control and wherein a user input received via the physical control is arranged to trigger provision of additional information relating to a notification to the user via the speech based interface or to initiate a speech-based interaction.

10. A wearable, hands-free audio accessory according to claim 1 , wherein the speech detection module is at least partially implemented using hardware logic selected from any one or more of: a field-programmable gate array, a program-specific integrated circuit, a program-specific standard product, a system-on-a-chip, and a complex programmable logic device.

11. A method of controlling operation of wearable, hands-free, head-free audio accessory for a host computing device, the method comprising:

arranging a directional loudspeaker and a directional microphone to provide a speech based interface between a user and the host computing device for both user-initiated microtasks and host computing device initiated microtasks and wherein the directional loudspeaker is operative for providing notifications for the host computing device initiated microtasks;

arranging an always-on audio sensing channel and a speech detection module to continuously monitor an audio signal detected by the directional microphone and to trigger a first higher level of audio processing based on a detected level of the audio signal and to trigger a second higher level of audio processing based on detection of a predefined keyword;

arranging the always-on audio sensing channel and the speech detection module to control notifications to the user based at least in part on a determination that the user is having a conversation;

providing, via a wireless interface, a communication link between the audio accessory and the host computing device; and

detecting, via a sensor arrangement, whether the accessory is attached to an object, the accessory being arranged to attach to an item of clothing worn by the user.

12. A method according to claim 11 , further comprising:

canceling authentication between the host computing device and the audio accessory in response to detecting detachment of the audio accessory from an object.

13. A method according to claim 11 , further comprising:

providing a signal from a microphone or other sensor in the audio accessory to context sensing software in the host computing device via the wireless interface in the audio accessory.

14. A method according to claim 11 , further comprising:

storing, in an audio buffer providing a recording loop, an audio signal detected via the microphone in the audio accessory; and

outputting a delayed audio signal to audio processing elements in the audio accessory or the host computing device.

15. A method according to claim 11 , further comprising:

determining whether to provide an alert based on a pre-determined length of time without any speech detected by the speech detection module;

determining whether to delay the alert based on whether the alert is appropriate;

determining a type of the alert to provide based on whether the alert is delayed; and

displaying status information on a wireless interface, the wireless interface including a display and light emitting diodes (LEDs).

16. A method according to claim 11 , further comprising controlling operation of the always-on audio sensing channel based on output of the sensor arrangement.

17. A method according to claim 11 , further comprising triggering a requirement for re-authentication between the audio accessory and the host computing device following detection of detachment of the audio accessory from the object.

18. A method according to claim 11 , further comprising providing a recording loop for the audio signal detected via the microphone to accommodate any latency associated with keyword detection.

19. A method according to claim 11 , wherein the speech based interface comprises an audio processing hierarchy comprising at least three levels.

20. A method according to claim 11 , further comprising initiating a speech-based interaction in response to a user input received via a physical control.