Lighting integrated sound processing

1. A lighting system, comprising:

a first lighting fixture comprising a first microphone, a first transmitter, a first light source to emit a first illumination light, and a first lighting driver to provide a first power to the first light source, wherein the first transmitter is configured to transmit a first digital audio stream generated at least based on a sound;

a second lighting fixture comprising a second microphone, a second transmitter, a second light source to emit a second illumination light, and a second lighting driver to provide a second power to the second light source, wherein the second transmitter is configured to transmit a second digital audio stream generated at least based on the sound and wherein the sound is received by the first microphone and by the second microphone; and

a central processor that is external to the first lighting fixture and the second lighting fixture, wherein the central processor is configured to process the first digital audio stream and the second digital audio stream to identify the sound and wherein the central processor is configured to subtract the first digital audio stream from the second digital audio stream during the processing of the first digital audio stream and the second digital audio stream to identify the sound.

2. The lighting system of claim 1 , wherein the first lighting fixture is configured to send first timestamp information in or associated with the first digital audio stream, wherein the first timestamp information indicates a first time arrival of the sound at the first lighting fixture, wherein the second lighting fixture is configured to send second timestamp information in or associated with the second digital audio stream, and wherein the second timestamp information indicates a second time arrival of the sound at the second lighting fixture.

3. The lighting system of claim 2 , wherein the central processor is configured to estimate a location of a source of the sound based on the first timestamp information and the second timestamp information.

4. The lighting system of claim 1 , wherein the central processor is configured to identify whether the sound is a particular voice command, a breaking-glass sound, a sound of footsteps, a fire alarm sound, or a smoke alarm sound.

5. The lighting system of claim 1 , wherein the first lighting fixture includes a speaker and wherein the speaker is configured to output an output sound based on information received from the central processor in response to identifying the sound.

6. The lighting system of claim 5 , wherein the first lighting fixture is located in an area and wherein the central processor sends the information to the first lighting fixture in response to a detection of a person in the area.

7. The lighting system of claim 1 , wherein the first light source is configured to provide a visual notification based on information received from the central processor in response to identifying the sound.

8. A method of sound-based operation of a lighting system, the method comprising:

providing multiple lighting fixtures;

receiving, by the multiple lighting fixtures, a sound;

transmitting, by at least two lighting fixtures of the multiple lighting fixtures, digital audio streams that each contain an audio content corresponding to the sound, wherein each lighting fixture of the at least two lighting fixtures comprises a microphone, a transmitter, a light source to emit an illumination light, and a lighting driver to provide a power to the light source; and

identifying, by a central processor that is external to the multiple lighting fixtures, the sound by subtracting a first digital audio stream of the digital audio streams from a second digital audio stream of the digital audio streams.

9. The method of claim 8 , wherein each digital audio stream of the digital audio streams contains timestamp information corresponding to or indicative of a time at which the sound is received at the lighting fixture transmitting the particular digital audio stream.

10. The method of claim 9 , further comprising determining or estimating, by the central processor, a location of a source of the sound.

11. The method of claim 10 , wherein determining or estimating the location of the source of the sound is performed based on the timestamp information.

12. The method of claim 8 , further comprising controlling a light emitted by one or more of the multiple lighting fixtures in response to identifying the sound.

13. The method of claim 8 , wherein identifying the sound includes identifying the sound as a breaking-glass sound, a sound of footsteps, a fire alarm sound, or a smoke alarm sound.

14. The method of claim 8 , wherein identifying the sound includes identifying the sound as a particular voice command.

15. The method of claim 8 , wherein each lighting fixture of the multiple lighting fixtures transmits a digital audio stream in response to determining that an amplitude of the sound at the particular lighting fixture exceeds a threshold.

16. A method of sound processing in a lighting system, the method comprising:

providing a first lighting fixture and a second lighting fixture;

receiving, by the first lighting fixture, a voice command;

receiving, by the second lighting fixture, the voice command;

transmitting, by the first lighting fixture, a first digital audio stream that contains a first audio content corresponding to the voice command;

transmitting, by the second lighting fixture, a second digital audio stream that contains a second audio content corresponding to the voice command;

identifying, by a central processor, the voice command by subtracting the first digital audio stream from the second digital audio stream; and

transmitting, by the central processor, to the second lighting fixture a response to the voice command, wherein the central processor is external to the first lighting fixture and the second lighting fixture, wherein the second lighting fixture comprises a motion sensor and wherein the central processor transmits the response to the voice command to the second lighting fixture in response to a motion detection by the motion sensor.

17. The method of claim 16 , wherein the central processor transmits the response to the voice command to the second lighting fixture in response to a detection of a person near the second lighting fixture.

18. The method of claim 16 , wherein the central processor transmits the response to the voice command to the second lighting fixture in response to the voice command referring to the second lighting fixture.