Failure detection system and failure detection method

摘要

A failure detection system includes an omnidirectional microphone array device having a plurality of microphone elements and a directivity control device that calculates a delay time of a voice propagated from a sound source to each microphone element and forms a directivity of the voice using the delay time and the voice collected by the omnidirectional microphone array device, and detects a failure of the microphone element. A smoothing unit calculates an average power of one microphone element. An average calculator calculates a total average power of a plurality of usable microphone elements included in the omnidirectional microphone array device. A comparison unit compares whether or not a difference between the average power and the total average power exceeds a range of ±6 dB, and determines whether the microphone element is in failure based on the comparison result.

主权项

1. A failure detection system comprising:
a sound collector including a plurality of sound collection elements; a first calculator configured to calculate, for each sound collection element of the plurality of sound collection elements, a power value of sound output from the sound collection element; a second calculator configured to calculate a total average power value, by calculating a sum of at least one power value of sound output from at least one usable sound collection element of the plurality of sound collection elements, without using a power value of sound output from a sound collection element which has already been known as in failure, and by dividing the sum by a number of the at least one usable sound collection element; and a failure detector configured to determine whether or not a sound collection element in failure is present, by comparing a difference between the power value for each sound collection element and the total average power value with a predetermined range.