Estimating Noise at One Frequency by Sampling Noise at Other Frequencies
AssigneeExxonMobil Upstream Research Company
InventorsDennis E. Willen, Xinyou Lu
Life of this patent
Estimating the term…
Abstract
A method, apparatus and computer program for improving the signal-to-noise ratio of a signal S(t), S(t) containing Signal and noise, are disclosed. A measurement of S(t) at a frequency-of-interest is obtained. Noise measurements of S(t) at one or more noise frequencies where the Signal portion of S(t) is expected to be small are obtained. The noise at the frequency-of-interest is estimated using the noise measurements at the one or more noise frequencies. The estimated noise is subtracted from the measurement of S(t) at the frequency-of-interest.
Claims27
A method for improving the signal-to-noise ratio of a signal S(t), S(t) containing Signal and noise, the method comprising:
- (a) transforming measurements of S(t) to frequency domain, and obtaining a measurement of S(t) at a frequency-of-interest;
- (b) obtaining noise measurements of S(t) at one or more noise frequencies where the Signal portion of S(t) is expected to be small;
- (c) estimating the noise at the frequency-of-interest using the noise measurements at the one or more noise frequencies;
- and
- (d) subtracting the estimated noise from the measurement of S(t) at the frequency-of-interest.
A computer program, stored in a tangible medium, for improving the signal-to-noise ratio of a signal S(t), S(t) containing Signal and noise, the program comprising executable instructions that cause a computer to:
- (a) transform measurements of S(t) to frequency domain, and obtain a measurement of S(t) at a frequency-of-interest;
- (b) obtain noise measurements of S(t) at one or more noise frequencies where the Signal portion of S(t) is expected to be small;
- (c) estimate the noise at the frequency-of-interest using the noise measurements at the one or more noise frequencies;
- and
- (d) subtract the estimated noise from the measurement of S(t) at the frequency-of-interest.
Dependencies are inferred from the claim text.