Audio device with ultrasound movement detection
An audio device comprising, an interface, one or more first output transducers, one or more input transducers, and a processor. The audio device is configured to emit a first ultrasound signal, receive a first reflection indicative of the first ultrasound signal, process the first reflection to determine movement, and in response to movement being determined, adjust one or more audio processing parameters of the audio device.
1. An audio device comprising, an interface, one or more first output transducers, one or more input transducers, and a processor, wherein the audio device is configured to:
emit by the one or more first output transducers a first ultrasound signal into a first region surrounding the audio device,
receive a first reflection indicative of the first ultrasound signal via the one or more input transducers,
process by the processor the first reflection to determine first movement of a first object within the first region, and
in response to first movement being determined, adjust by the processor one or more audio processing parameters of the audio device wherein to process the first reflection to determine first movement of the first object within the first region comprises to determine a center shift based on a predetermined center frequency of the first ultrasound signal, and
wherein to process the first reflection to determine first movement of the first object within the first region comprises to compare the center shift to a higher movement threshold, and wherein if the center shift exceeds the higher movement threshold determine no movement of the first object within the first region.
2. An audio device according to claim 1 , wherein the one or more audio processing parameters comprises one or more parameters associated with a beamformer of the audio device.
3. An audio device according to claim 2 , wherein the one or more audio processing parameters associated with a beamformer of the audio device comprises a beamformer update rate.
4. An audio device according to claim 1 , wherein the one or more audio processing parameters comprises one or more parameters associated with an echo controller of the audio device.
5. An audio device according to claim 4 , wherein the one or more audio processing parameters associated with an echo controller of the audio device comprises a threshold for near end speech classification.
6. An audio device according to claim 1 , wherein to process the first reflection to determine first movement of the first object within the first region comprises to compare the centre shift to a lower movement threshold, and wherein if the centre shift exceed the lower movement threshold determine first movement of the first object within the first region.
7. An audio device according to claim 1 , wherein to process the first reflection to determine first movement of a first object within the first region comprises to:
determine a max speed for which movement of the first object is determined
determine an analysis frequency range in which the centre frequency shift is determined based on the max speed movement and the predetermined centre frequency.
8. An audio device according to claim 1 , wherein to process the first reflection to determine first movement of the first object within the first region comprises to determine a plurality of side shifts in a number of predetermined sidebands of the first ultrasound signal, such as 2-20 sidebands, preferably 4-12 sidebands.
9. An audio device according to claim 1 , wherein to process the first reflection to determine first movement of the first object within the first region comprises using a Goertzel algorithm.
10. An audio device according to claim 1 comprising one or more second output transducers, wherein the audio device is configured to:
emit by the one or more second output transducers a second ultrasound signal into a second region surrounding the audio device, wherein the second region differs from the first region,
receive a second reflection indicative of the second ultrasound signal via the one or more input transducers,
process by the processor the second reflection to determine second movement of a second object within the second region,
adjust by the processor one or more audio processing parameters of the audio device based on the determined first movement and/or the determined second movement.
11. An audio device according to claim 10 , wherein the audio device is configured to:
determine by the processor a first set of beamformer parameters associated with the first region,
determine by the processor a second set of beamformer parameters associated with the second region,
if first movement is determined, adjust by the processor the first set of beamformer parameters,
if second movement is determined, adjust by the processor the second set of beamformer parameters.
12. An audio device according to claim 10 , wherein the audio device is configured to:
if first movement is determined, determine by the processor one or more predetermined beamformer parameters associated with the first region, and in response to speech in the first region being detected by the audio device, determine one or more beamformer parameters based on the one or more predetermined beamformer parameters associated with the first region,
if second movement is determined, determine by the processor one or more predetermined beamformer parameters associated with the second region, and in response to speech in the second region being detected by the audio device, determine one or more beamformer parameters based on the one or more predetermined beamformer parameters associated with the second region.