Determining defective devices which generate sound during operation
First Claim
Patent Images
1. A method for determining whether a device is defective, said method comprising:
- generating a plurality of digital samples representing a plurality of sound signals generated by said device; and
examining said plurality of digital samples to determine whether said device is defective including;
processing said digital samples to convert said plurality of sound signals to frequency domain, wherein said processing generates a frequency spectrum including a plurality of frequencies and a corresponding plurality of levels of intensity;
maintaining a threshold number associated with each of said plurality of frequencies; and
analyzing said frequency spectrum to determine said defects in said device comprising;
comparing each of said threshold numbers with a corresponding one of said plurality of levels of intensity, anddetermining whether said device is defective according to said comparing.
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Abstract
Determining whether a device is defective by analyzing the sound signals generated by the device. Digital samples are generated to represent the sound signals. Digital samples are transformed from the time domain to the frequency domain to generate a frequency spectrum. By comparing the levels of intensity at a corresponding frequency to the threshold levels of intensity, defective devices can be determined.
17 Citations
22 Claims
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1. A method for determining whether a device is defective, said method comprising:
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generating a plurality of digital samples representing a plurality of sound signals generated by said device; and examining said plurality of digital samples to determine whether said device is defective including; processing said digital samples to convert said plurality of sound signals to frequency domain, wherein said processing generates a frequency spectrum including a plurality of frequencies and a corresponding plurality of levels of intensity; maintaining a threshold number associated with each of said plurality of frequencies; and analyzing said frequency spectrum to determine said defects in said device comprising; comparing each of said threshold numbers with a corresponding one of said plurality of levels of intensity, and determining whether said device is defective according to said comparing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A computer readable medium carrying one or more sequences of instructions for causing a system to determine whether a device is defective, wherein execution of said one or more sequences of instructions by one or more processors contained in said system causes said one or more processors to perform the actions of:
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receiving a plurality of digital samples representing a plurality of sound signals generated by said device; and examining said plurality of digital samples to determine whether said device is defective including; processing said digital sample to convert said plurality of sound signals to frequency domain, wherein said processing generates a frequency spectrum including a plurality of frequencies and a correspondig plurality of levels of intensity; maintaining a threshold number associated with each of said plurality of frequencies; and analyzing said frequency spectrum to determine said defects in said device comprising; comparing each of said threshold numbers with a corresponding one of said plurality of levels of intensity, and determining whether said device is defective according to said comparing. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A digital processing system for determining whether a device is defective, said digital processing system comprising:
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means for receiving a plurality of digital samples representing a plurality of sound signals generated by said device; and means for examining said plurality of digital samples to determine whether said device is defective including; means for processing said digital samples to convert said plurality of sound signals to frequency domain, wherein said processing generates a frequency spectrum including a plurality of frequencies and a corresponding plurality of levels of intensity; means for maintaining a threshold number associated with each of said plurality of frequencies; and means for analyzing said frequency spectrum to determine said defects in said device comprising; means for comparing each of said threshold numbers with a corresponding one of said plurality of levels of intensity, and means for determining whether said device is defective according to said comparing. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification