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US 2010/0161089 A1Published application
Device for generating sound messages with integrated defect detection
AssigneeThales
InventorsJacques Phelippeau, Célia Ratinaud
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AssigneeThales
InventorsJacques Phelippeau, Célia Ratinaud
Estimating the term…
In an audio device for generating sound messages MSGi, a detection of defects is carried out by the digital superposition, on the samples of audio sequences to be restored Sqi applied as input to a digital analogue conversion audio chain 10-1, of a test signal SqT having a spectrum of frequency(frequencies) outside of the spectrum of frequencies of the sound messages, and the application of this test signal SqT to the input of a duplicated audio chain 10-2, and in the extraction of a corresponding test signal, at the output of the conversion chain, the characteristics of which are compared with those of the test signal applied as input. This detection principle has notably the advantage of being simple to implement in an integrated manner, allowing the use of such devices in systems for managing alarms, notably for managing alarms in aircraft. The analogue-audio signal Si to be applied to the loudspeaker 3 is constructed at the output of the chain by eliminating the superimposed test signal.
Device for generating sound messages, comprising a first digital analogue conversion audio chain for providing an audio signal to a loudspeaker, the said chain being activated by a monitoring circuit on receipt of a control signal for instructing emission of a sound message, so as to convert a sequence of digital samples corresponding to the said sound message, further comprising an integrated device for detecting faults comprising:
A method for verifying the integrity of a device for generating sound messages, the device comprising a first digital analogue conversion audio chain for providing an audio signal to a loudspeaker, the said chain being activated by a monitoring circuit on receipt of a control signal for instructing emission of a sound message, so as to convert a sequence of digital samples corresponding to the said sound message, wherein the method consists in duplicating the said audio chain, in generating a digital test signal having a spectrum of frequency(frequencies) (outside of the spectrum of frequencies of the sound messages emitted by the said device, in superimposing this test signal on the sequences of digital samples applied as input to the first audio chain, in applying this test signal to the duplicated audio chain, in adding together the respective outputs of the two audio chains, and extracting an output test signal, so as to compare the characteristics thereof with those of the test signal applied as input.
Dependencies are inferred from the claim text.