Method of detecting wear of a tyre

A computer programmed with code that, when executed, performs method for detecting a wear condition of a tyre that includes a first tread pattern element adapted to generate a first acoustic footprint noise and a second tread pattern element adapted to generate a second acoustic footprint noise, the first and second acoustic footprint noises being characteristic of the wear condition of the tyre, the method comprising steps of:

• acquiring an acoustic signal that is capable of including the first and second acoustic footprint noises;
• selecting a parent frequency spectrum, which is capable of forming a frequency spectrum of one of the first and second acoustic footprint noises, from within a frequency spectrum of the acquired acoustic signal;
• determining a trimmed frequency spectrum by eliminating at least part of the parent frequency spectrum from the frequency spectrum of the acquired acoustic signal;
• selecting a child frequency spectrum, which is capable of forming a frequency spectrum of another of the first and second acoustic footprint noises, from within the trimmed frequency spectrum;
• determining two detection confidence indices, which are indices associated with detection of the first and second acoustic footprint noises, based on at least one characteristic of each of the parent frequency spectrum and the child frequency spectrum;
• and
• if each of the two detection confidence indices meets a predetermined condition relating to detection of each of the first and second acoustic footprint noises, a warning is emitted indicating detection of wear of the tyre.

A non-transitory computer-readable storage medium storing code that, when executed by a computer, causes the computer to perform a method for detecting a wear condition of a tyre that includes a first tread pattern element adapted to generate a first acoustic footprint noise and a second tread pattern element adapted to generate a second acoustic footprint noise, the first and second acoustic footprint noises being characteristic of the wear condition of the tyre, the method comprising steps of:

• acquiring an acoustic signal that is capable of including the first and second acoustic footprint noises;
• selecting a parent frequency spectrum, which is capable of forming a frequency spectrum of one of the first and second acoustic footprint noises, from within a frequency spectrum of the acquired acoustic signal;
• determining a trimmed frequency spectrum by eliminating at least part of the parent frequency spectrum from the frequency spectrum of the acquired acoustic signal;
• selecting a child frequency spectrum, which is capable of forming a frequency spectrum of another of the first and second acoustic footprint noises, from within the trimmed frequency spectrum;
• determining two detection confidence indices, which are indices associated with detection of the first and second acoustic footprint noises, based on at least one characteristic of each of the parent frequency spectrum and the child frequency spectrum;
• and
• if each of the two detection confidence indices meets a predetermined condition relating to detection of each of the first and second acoustic footprint noises, a warning is emitted indicating detection of wear of the tyre.

A process for detecting tyre wear, the processing comprising steps of:

• storing, on a non-transitory computer-readable storage medium, code that when executed by a computer causes the computer to perform a method for detecting a wear condition of a tyre that includes a first tread pattern element adapted to generate a first acoustic footprint noise and a second tread pattern element adapted to generate a second acoustic footprint noise, the first and second acoustic footprint noises being characteristic of the wear condition of the tyre, the method including:
• acquiring an acoustic signal that is capable of including the first and second acoustic footprint noises;
• selecting a parent frequency spectrum, which is capable of forming a frequency spectrum of one of the first and second acoustic footprint noises, from within a frequency spectrum of the acquired acoustic signal;
• determining a trimmed frequency spectrum by eliminating at least part of the parent frequency spectrum from the frequency spectrum of the acquired acoustic signal;
• selecting a child frequency spectrum, which is capable of forming a frequency spectrum of another of the first and second acoustic footprint noises, from within the trimmed frequency spectrum;
• determining two detection confidence indices, which are indices associated with detection of the first and second acoustic footprint noises, based on at least one characteristic of each of the parent frequency spectrum and the child frequency spectrum;
• and
• if each of the two detection confidence indices meets a predetermined condition relating to detection of each of the first and second acoustic footprint noises, a warning is emitted indicating detection of wear of the tyre;
• and
• enabling the code to be downloaded via a telecommunications network.