Method and device for multichannel multifrequency analysis of an object
First Claim
1. Method for multichannel multifrequency analysis of an object, comprising:
- generating a set of excitation signals wherein all excitation signals are periodic signals with preselected frequencies;
applying said set of excitation signals simultaneously to the object;
receiving from the object, in response to said set of excitation signals, a response signal corresponding to said set of excitation signals, modulated by the object'"'"'s properties, said response signal comprising a set of components with different frequencies;
calculating a set of phase-related sampling instances based on said set of excitation signals, for each frequency of interest and for at least one predetermined observation time slot;
demodulating said response signal to separate the response to each excitation signal by quantizing and processing of said response signal at each sampling instances of said set of sampling instances, wherein said quantizing is performed for each frequency of interest of said response signal in predetermined mode; and
obtaining a set of main frequency and time tagged estimates, each of said estimates comprising a plurality of sub-estimates, said sub-estimates representing a signal value, for said observation time slot, wherein the length of said observation time slot is selected so that it contains integer numbers of periods of each excitation signal of said set of excitation signals, wherein each of said estimates are sorted separately so the estimates at each frequency of interest are obtained while impacts of other estimates are cancelled out.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for multichannel multifrequency analysis of an object, applying a set of excitation signals to the object and sampling the response signal from the object, using uniform and non-uniform undersampling. Non-uniform sampling of the response signal is performed, i.e., the sampling is performed for two or more different frequencies in one observation time slot. Also, uniform sampling of the response signal is performed, i.e., the sampling of a signal, corresponding to one frequency, is performed for two or more channels within one observation time slot and then sampling the same signal for another frequency for two or more channels within the next observation time slot.
-
Citations
17 Claims
-
1. Method for multichannel multifrequency analysis of an object, comprising:
-
generating a set of excitation signals wherein all excitation signals are periodic signals with preselected frequencies; applying said set of excitation signals simultaneously to the object; receiving from the object, in response to said set of excitation signals, a response signal corresponding to said set of excitation signals, modulated by the object'"'"'s properties, said response signal comprising a set of components with different frequencies; calculating a set of phase-related sampling instances based on said set of excitation signals, for each frequency of interest and for at least one predetermined observation time slot; demodulating said response signal to separate the response to each excitation signal by quantizing and processing of said response signal at each sampling instances of said set of sampling instances, wherein said quantizing is performed for each frequency of interest of said response signal in predetermined mode; and obtaining a set of main frequency and time tagged estimates, each of said estimates comprising a plurality of sub-estimates, said sub-estimates representing a signal value, for said observation time slot, wherein the length of said observation time slot is selected so that it contains integer numbers of periods of each excitation signal of said set of excitation signals, wherein each of said estimates are sorted separately so the estimates at each frequency of interest are obtained while impacts of other estimates are cancelled out. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification