Device and method for processing a digital signal
AssigneeAktiebolaget Skf
InventorsJames P. Leblanc, Patrik Pääjärvi
Life of this patent
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Abstract
A device for processing a digital signal includes a Farrow structure (14) that applies to the digital signal a time-varying sample rate conversion from the fixed sample rate to a time varying sampling. The digital signal sampled at the time varying sampling is a resulting signal. The Farrow structure (14) is controlled from a control variable. A spectral analysis means (15) performs a spectral analysis of the resulting signal to determine the frequency values of the resulting signal. A determining means (16) determines a sparseness parameter of the frequency values of the resulting signal. A controlling means (17) modifies the control variable according to the value of the sparseness parameter.
Claims14
A method for processing a digital signal comprising samples of a continuous signal sampled at a fixed sample rate, the continuous signal being representative of vibrations of a bearing undergoing rotational speed changes, the method comprising:
- applying to the digital signal a time-varying sample rate conversion by a Farrow structure from the fixed sample rate to a time varying sampling, the digital signal sampled at the time varying sampling being a resulting signal, the Farrow structure being controlled from a control variable;
- performing a spectral analysis of the resulting signal to determine frequency values of the resulting signal;
- determining a sparseness parameter of the frequency values of the resulting signal;
- and
- modifying the control variable according to the value of the sparseness parameter.
A device for processing a digital signal comprising samples of a continuous signal sampled at a fixed sample rate, the continuous signal being representative of vibrations of a bearing undergoing rotational speed changes, the device comprising:
- a Farrow structure configured to apply to the digital signal a time-varying sample rate conversion from the fixed sample rate to a time varying sampling, the digital signal sampled at the time varying sampling being a resulting signal, and the Farrow structure being configured to be controlled from a control variable;
- spectral analysis means configured to perform a spectral analysis of the resulting signal to determine frequency values of the resulting signal;
- determining means configured to determine a sparseness parameter of the frequency values of the resulting signal;
- and
- controlling means configured to modify the control variable according to the value of the sparseness parameter.
Dependencies are inferred from the claim text.