Automatic-diagnostic of electrical equipment by sound footprint

A diagnostic method of electrical equipment, wherein the electrical equipment comprises:

• a processing unit;
• at least one internal microphone, and/or means for connecting to at least one external microphone;
• and
• electrical components other than microphones or speakers;
• the diagnostic method being implemented at least partially in the processing unit and comprising the steps of:
• acquiring a received audio signal produced from capturing an ambient sound signal, by the at least one internal microphone or by the at least one external microphone;
• producing monitoring parameters from the received audio signal, which are representative of an interfering sound signal comprised in the ambient sound signal and emitted by at least one of the electrical components;
• detecting a sound anomaly resulting from a current or future failure of at least one electrical component of the electrical equipment from the monitoring parameters,
• detecting if the electrical equipment, at the time of acquiring the received audio signal, is in the process of emitting a useful sound signal, or is not in the process of emitting a useful sound signal, the useful sound signal comprising sounds voluntarily emitted;
• if the electrical equipment is in the process of emitting a useful sound signal, then
• applying the received audio signal to an input of an acoustic echo cancellation module, to produce a resulting signal, the monitoring parameters being obtained from the resulting signal;
• and
• if the electrical equipment is not in the process of emitting a useful sound signal, then not applying the received audio signal to the input of the acoustic echo cancellation module.