Importance

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Abstract

An apparatus monitors physical signals, such as vibration, produced by an asset, such as a motor. Sensor signals corresponding to the physical signals are applied to a bandpass Görtzel filter that passes a frequency band around a characteristic frequency of a physical signal. An analyzer produces information corresponding to the physical condition of the asset based on the Görtzel filtered signal. A tracking unit periodically updates parameters of the Görtzel filter so that the bandpass frequencies of the Görtzel filter track the characteristic frequency of the physical signal. Each Görtzel filter may include a comb filter whose output is applied to a plurality of resonators, whose outputs are applied to a windowing unit. The Görtzel filter is preferably a Görtzel filter block that is made up of a plurality of individual Görtzel filters. The tracking unit continuously updates the operating characteristics of the multiple Görtzel filters within the Görtzel filter block such that one Görtzel filter has a bandpass center frequency at the characteristic frequency and other Görtzel filters have center frequencies that are immediately above and immediately below the characteristic frequency. Thus, if the characteristic frequency changes up or down, the shifted Görtzel filters will pass those frequencies, and the signal at the actual characteristic frequency will not be lost.

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First Claim