Patent ID: 8634945

Claim:
Device for generating sound messages, comprising: a. a first digital to analogue conversion system for providing an audio signal to a loudspeaker comprising: i. a sequence of digital samples corresponding to particular sound messages, the sound messages having a spectrum of emission frequencies; ii. a control signal that instructs a monitoring circuit to activate an audio chain to emit the particular sound messages; b. an integrated device for detecting faults comprising: i. a test signal comprising a spectrum of emission frequencies outside the spectrum of frequencies of the operational sound messages; ii. a digital adder for superimposing, at the input of the first audio chain, the test signal; iii. a second audio chain identical to the first audio chain, receiving as input the test signal; iv. an analog adder for adding together the outputs of the first and second audio chains; v. a filter applied to the output of the analog adder for extracting an output test signal through filtering of the corresponding frequencies' spectrum of the operational sound messages; and vi. a comparator for comparing the characteristics of the test signal applied as input and of the output test signal.