Processing of signals from luminaire mounted microphones for enhancing sensor capabilities
The specification and drawings present a use of multiple microphones for increasing acoustic sensing capabilities by processing acoustic signals from the multiple microphones in outdoor luminaire mounted surveillance/sensor systems. For example, various embodiments presented herein describe signal processing means to utilize stereo/multiple microphones in a luminaire (such as an outdoor roadway luminaire) to provide enhanced information regarding the surroundings of the luminaire. The multiple microphone luminaire sensor processing system can provide a more environmentally robust and sensitive approach which can be, for example, resistant to environmental noise such as a wind noise, as well as capable of isolating specific sounds from the surroundings, e.g., in specific directions.
1. An outdoor luminaire comprising:
a luminaire unit comprising LED modules;
a sensor module attached to the luminaire unit, wherein the sensor module comprises:
a housing and a plurality of microphones seated within the housing; and
a computing module operably connected to the plurality of microphones, the computing module comprising a processor and a memory, the memory storing program logic configured to cause the processor to:
receive information comprising a plurality of acoustic output signals from the corresponding plurality of microphones, and any of detection directionality and location for each of the plurality of microphones; and
process, using the received information, the plurality of acoustic output signals to:
select acoustic output signals which are above a predefined noise floor level associated with each of the plurality of microphones and stored in the memory of the computing module,
identify a desirable acoustic signal at least in one of the selected acoustic output signals using analysis of the received plurality of acoustic output signals, and
correlate the acoustic output signals with any of the detection directionalities and locations of the plurality of microphones.
2. The outdoor luminaire of claim 1 , wherein the processing is performed in a frequency domain using a fast Fourier transform.
3. The outdoor luminaire of claim 1 , wherein the processing is performed in a time domain.
4. The outdoor luminaire of claim 1 , wherein, when at least two of selected acoustic output signals have different sound features, said correlation comprises associating each of the acoustic signals having different sound features, with a corresponding further signal from a further sensor of the luminaire having a same directionality as the corresponding detection directionality of the corresponding microphone.
5. The outdoor luminaire of claim 4 , wherein the further sensor is a video camera, and the corresponding further signal is a video signal.
6. The outdoor luminaire of claim 1 , wherein, when at least two of selected acoustic output signals have similar sound features but different noise levels, said identifying comprises choosing one of the selected acoustic signal with a minimum noise level.
7. The outdoor luminaire of claim 1 , wherein the selected acoustic output signals have sound feature differences in a predefined range and have a similar noise level, a subtraction technique between the corresponding selected acoustic output signals is used to better isolate a specific sound of interest.
8. The outdoor luminaire of claim 1 , wherein the program logic further comprises:
logic for receiving, wirelessly or through a wired connection, by the sensor module one or more further acoustic signals from corresponding one or more further microphones outside of the luminaire with information about further microphones' detection directionalities and locations; and
logic for further processing, by the computing module, the plurality of acoustic output signals with added one or more further acoustic signals for said identification and correlation.
9. The outdoor luminaire of claim 1 , wherein the plurality of microphones are spatially separated and have different detection directionalities.
10. An outdoor luminaire comprising:
a luminaire unit comprising LED modules;
a sensor module attached to the luminaire unit, wherein the sensor module comprises a housing, a plurality of microphones within the housing, and a plurality of further sensors; and
a computing module operably connected to the plurality of microphones, the computing module comprising a processor and a memory, the memory storing program logic configured to cause the processor to:
receive information comprising a plurality of acoustic output signals from the corresponding plurality of microphones, and detection directionality for each of the plurality of microphones; and
process, using the received information, the plurality of acoustic output signals to:
select acoustic output signals which are above a predefined noise floor level associated with each of the plurality of microphones and stored in the memory of the computing module,
identify a desirable acoustic signal at least in one of the selected acoustic output signals using analysis of the received plurality of acoustic output signals, and
correlate the acoustic output signals with the detection directionalities of the plurality of microphones, said correlate step comprising associating an acoustic signal of at least one microphone of the plurality of microphones with a corresponding further signal from at least one of the further sensors having a same directionality as the corresponding detection directionality of the at least one microphone.