Method for identifying sirens of priority vehicles and warning a hearing-impaired driver of the presence of a priority vehicle

1. A method for identifying sirens of a plurality of priority vehicles and for warning a hearing-impaired driver of a motor vehicle of a presence of at least one priority vehicle of the plurality of priority vehicles in an environment of the motor vehicle, the method comprising:

acquiring an audio recording of the environment;

analyzing the audio recording comprising comparing the frequencies acquired from the audio recording with previously-stored frequencies associated with a siren of the at least one priority vehicle, for each type of the plurality of priority vehicles by taking into account at least one fundamental frequency of the siren with at least the first five harmonics of the at least one fundamental frequency; and

warning the hearing-impaired driver that the at least one priority vehicle is driving in the environment of the motor vehicle when it is detected that frequencies of the siren of the at least one priority vehicle are present in the audio recording.

2. The method as claimed in claim 1 , wherein the acquired frequencies are taken into account only when the amplitude of the acquired frequencies is higher than a minimum threshold.

3. The method as claimed in claim 2 , wherein the warning comprises emitting a light signal in a field of view of the hearing-impaired driver.

4. The method as claimed in claim 2 , wherein, for each siren of the plurality of priority vehicles, one or more fundamental frequencies specific to the respective siren are stored with an alternation and a number of cycles per minute of repetitions of the frequencies specific to the respective siren.

5. The method as claimed in claim 2 , further comprising carrying out band-pass filtering with a pass band comprised between 400 Hz and 7 kHz on the audio recording before the analyzing.

6. The method as claimed in claim 1 , wherein the warning comprises emitting a light signal in a field of view of the hearing-impaired driver.

7. The method as claimed in claim 6 , wherein the light signal is emitted by one or more indicator lights.

8. The method as claimed in claim 7 , wherein the warning indicates an origin of the siren with respect to the motor vehicle and the type of priority vehicle associated with the detected siren.

9. The method as claimed in claim 7 , wherein, for each siren of the plurality of priority vehicles, one or more fundamental frequencies specific to the respective siren are stored with an alternation and a number of cycles per minute of repetitions of the frequencies specific to the respective siren.

10. The method as claimed in claim 6 , wherein the warning indicates an origin of the siren with respect to the motor vehicle and the type of priority vehicle associated with the detected siren.

11. The method as claimed in claim 10 , wherein, for each siren of the plurality of priority vehicles, one or more fundamental frequencies specific to the respective siren are stored with an alternation and a number of cycles per minute of repetitions of the frequencies specific to the respective siren.

12. The method as claimed in claim 6 , wherein, for each siren of the plurality of priority vehicles, one or more fundamental frequencies specific to the respective siren are stored with an alternation and a number of cycles per minute of repetitions of the frequencies specific to the respective siren.

13. The method as claimed in claim 6 , wherein the light signal is displayed on an instrument panel.

14. The method as claimed in claim 6 , wherein the light signal is displayed as a text message displayed on a screen of an on-board computer of the motor vehicle.

15. The method as claimed in claim 1 , wherein, for each siren of the plurality of priority vehicles, one or more fundamental frequencies specific to the respective siren are stored with an alternation and a number of cycles per minute of repetitions of the frequencies specific to the respective siren.

16. The method as claimed in claim 1 , further comprising carrying out band-pass filtering with a pass band comprised between 400 Hz and 7 kHz on the audio recording before the analyzing.

17. The method as claimed in claim 1 , wherein the warning comprises generating vibrations of a device of the motor vehicle that are transmitted to the hearing-impaired driver.

18. The method as claimed in claim 17 , wherein the vibrations affect the seat or the steering wheel of the hearing-impaired driver.

19. A device for implementing a method for identifying sirens of a plurality of priority vehicles and for warning a hearing-impaired driver of a motor vehicle of a presence of at least one priority vehicle of the plurality of priority vehicles in an environment of the motor vehicle, the device comprising:

at least one sound receiver;

a computer comprising a storage configured to store a plurality of sets of frequencies each associated with a siren of a specific type of the plurality of priority vehicles, each of the plurality of sets of frequencies including at least two alternating frequencies, the computer being configured to

analyze the audio recording,

compare the frequencies of the audio recording with the stored sets of frequencies, and

detect the presence of the at least one priority vehicle in the environment of the motor vehicle based on the comparison; and

at least one visual and/or vibratory system configured to warn the driver when the presence of the at least one priority vehicle is detected in the environment of the motor vehicle.

20. The device as claimed in claim 19 , further comprising at least two microphones disposed towards the right rear and the left rear of the motor vehicle, respectively, said at least one visual and/or vibratory system configured to signal an origin of the siren to the right rear or the left rear of the motor vehicle thereby signaling a location of the at least one priority vehicle with respect to the motor vehicle of the hearing-impaired driver.