초록 ▼

An acoustic signature recognition and identification system receives signals from a sensor placed on a designated piece of equipment. The acoustic data is digitized and processed, via a Fast Fourier Transform routine, to create a spectrogram image of frequency versus time. The spectrogram image is t

An acoustic signature recognition and identification system receives signals from a sensor placed on a designated piece of equipment. The acoustic data is digitized and processed, via a Fast Fourier Transform routine, to create a spectrogram image of frequency versus time. The spectrogram image is then normalized to permit acoustic pattern recognition regardless of the surrounding environment or magnitude of the acoustic signal. A feature extractor then detects, tracks and characterizes the lines which form the spectrogram. Specifically, the lines are detected via a KY process that is applied to each pixel in the line. A blob coloring process then groups spatially connected pixels into a single signal object. The harmonic content of the lines is then determined and compared with stored templates of known acoustic signatures to ascertain the type of machinery. An alert is then generated in response to the recognized and identified machinery.

대표청구항 ▼

[ What is claimed:] [1.] A system for recognizing and identifying acoustic signals from a sensor, comprising:a pre-processor for generating a gray-level image of the acoustic signals;a feature extractor for detecting, tracking and characterizing at least one line of the gray-level image, said featur

[ What is claimed:] [1.] A system for recognizing and identifying acoustic signals from a sensor, comprising:a pre-processor for generating a gray-level image of the acoustic signals;a feature extractor for detecting, tracking and characterizing at least one line of the gray-level image, said feature extractor calculating a fundamental frequency for each of said at least one line and grouping said at least one line into harmonically related lines based on said fundamental frequency; anda post-processor for determining a harmonic content of said at least one line and comparing said harmonic content against known acoustic signatures by calculating a weighted score based on said fundamental frequency.