Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Patent
1997-10-27
2000-02-15
Malzahn, David H.
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
324 7621, 324 7647, 702 77, G06F 1710
Patent
active
060264187
ABSTRACT:
The frequency measurement method and associated apparatus accurately determines the frequency of a periodic signal even if the frequency exceeds the nyquist frequency, typically established by the analog to digital ("A/D") converter used to sample the signal. The frequency measurement method and apparatus obtains samples of a periodic signal at a number of sample rates, converts the samples to the frequency domain, analyzes the first order alias frequencies produced due to undersampling of the signal, and determines the frequency of the periodic signal based upon the alias frequencies. In selecting the sampling rate and the first order alias frequencies, the frequency measurement method and apparatus accounts for sampling errors, frequency calculation errors, desired frequency ranges, and measurement precision. Through error compensation and minimization techniques, the frequency measurement method and apparatus reduces the number of electrical components required (e.g. A/D converters). Further, the error compensation and minimization techniques utilized by the frequency measurement method and apparatus allows the use of shorter transforms for converting the time-domain data to the frequency domain, which thereby increases calculation speed while estimating the frequency of the periodic signals with greater accuracy.
REFERENCES:
patent: 4904930 (1990-02-01), Nicholas
patent: 5099194 (1992-03-01), Sanderson et al.
patent: 5099243 (1992-03-01), Tsui et al.
patent: 5109188 (1992-04-01), Sanderson et al.
patent: 5198748 (1993-03-01), Tsui et al.
patent: 5235287 (1993-08-01), Sanderson et al.
patent: 5293114 (1994-03-01), McCormick et al.
patent: 5323103 (1994-06-01), Choate et al.
patent: 5471396 (1995-11-01), White
patent: 5497400 (1996-03-01), Carson et al.
A.V. Balakrishnan, On The Problem Of Time Jitter In Sampling, IRE Transactions On Information Theory, Apr. 1962, pp. 226-236.
Stuart K. Tewksbury, Frederick C. Meyer, David C. Rollenhagen, H.K. Schoenwetter, Thomas M. Souders, Terminology Related To The Performance Of S/H, A/D, and D/A Circuits, IEEE Transactions On Circuits And Systems, vol. CAS-25, No. 7, Jul. 1978, pp. 419-426.
Albert H. Nuttall, Weighted Least Squares Fit Of A Real Tone To Discrete Data, By Means Of An Efficient Fast Fourier Transform Search, NUSC Technical Report 7785, Aug. 27, 1986.
J. Schoukens, R. Pintelon, H. Van hamme, The Interpolated Fast Fourier Transform: A Comparative Study, IEEE, 1991, pp. 358-364.
Yuichi Noro, Kenji Inomoto, Kazuhiro Kuno, Sinusoidal Frequency Estimation With Small-Sized DFT, Electronics And Communications In Japan, Part. 3, vol. 74, No. 1, 1991, pp. 22-30.
R.H. Walden, Analog-To-Digital Converter Technology Comparison, IEEE, 1994, pp. 217-219.
Malzahn David H.
McDonnell Douglas Corporation
LandOfFree
Frequency measurement method and associated apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frequency measurement method and associated apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency measurement method and associated apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1914793