Pulse analyzing method and apparatus
First Claim
Patent Images
1. Apparatus for producing an electrical signal conglomerate including wanted electrical signals and unwanted electrical signals, and for selecting the wanted electrical signals from the electrical signal conglomerate, comprising:
- (i) an electronic scanning device for producing the electrical signal conglomerate;
(ii) an analog to digital converter for digitizing the electrical signal conglomerate;
(iii) a succession of ordinal value filters of order integrally increasing from N (less than M) up to M for filtering the digitized electrical signal, each filter producing an output and the output of each filter serving as the input to the next filter in the succession except for the last in the line;
(iv) means for forming a succession of bandpass filter outputs by subtracting each filter output from its respective input;
(v) means for selecting a subset of values from the succession of bandpass output signals; and
(vi) means for adding the values of the selected subset to produce an electrical output signal representing the sum of the selected subset of values and thereby containing only the wanted electrical signals.
3 Assignments
0 Petitions
Accused Products
Abstract
A pulse analysing system for separating broadband wanted pulses of duration to include a predetermined plurality of data samples from a signal which also contains unwanted short signals, in which a data-sieve comprising a succession of ordinal signals of increasing value is employed in conjunction with pulse selection and addition of signals of a selected subset obtained from the data-sieve.
67 Citations
5 Claims
-
1. Apparatus for producing an electrical signal conglomerate including wanted electrical signals and unwanted electrical signals, and for selecting the wanted electrical signals from the electrical signal conglomerate, comprising:
-
(i) an electronic scanning device for producing the electrical signal conglomerate; (ii) an analog to digital converter for digitizing the electrical signal conglomerate; (iii) a succession of ordinal value filters of order integrally increasing from N (less than M) up to M for filtering the digitized electrical signal, each filter producing an output and the output of each filter serving as the input to the next filter in the succession except for the last in the line; (iv) means for forming a succession of bandpass filter outputs by subtracting each filter output from its respective input; (v) means for selecting a subset of values from the succession of bandpass output signals; and (vi) means for adding the values of the selected subset to produce an electrical output signal representing the sum of the selected subset of values and thereby containing only the wanted electrical signals.
-
-
2. Apparatus for producing a digitized electrical signal conglomerate including wanted electrical signals and unwanted electrical signals, and for selecting the wanted electrical signals from the electrical signal conglomerate, comprising:
-
(i) an electronic scanning device for producing the digitized electrical signal conglomerate; (ii) a succession of ordinal value filters of order integrally increasing from N (less than M) up to M for filtering the digitized electrical signal conglomerate, each filter producing an output and the output of each filter serving as the input to the next filter in the succession except for the last in the line; (iii) means for forming a succession of bandpass filter outputs by subtracting each filter output from its respective input; (iv) means for selecting a subset of values from the succession of bandpass output signals; and (v) means for adding the values of the selected subset to produce an electrical output signal representing the sum of the selected subset of values and thereby containing only the wanted electrical signals.
-
-
3. A method of signal analysis of an electrical signal, made up of electrical signal pulses whose widths are related to the size of objects in a scanned image together with electrical noise signals, comprising the steps of:
-
(i) scanning an image containing objects of different sizes to produce an analog electrical signal; (ii) converting the analog signal to a digital signal; (iii) ordinal value filtering at least a selected part of the digitized signal with a succession of filters of order increasing from N to M, producing an output signal from each filter, the input signal to each filter being the output signal from the previous filter in the succession; (iv) selecting a predetermined pair of the filter outputs; (v) producing an electrical output signal by subtracting one filter output from the earlier filter output of the said pair, so that the output signal contains only pulses within a range of widths determined by the two filters; and (vi) applying the said electrical output signal to a signal analyzer to allow output signals relating to objects of one size to be separated from output signals relating to objects of another size.
-
-
4. A method of signal analysis of an electrical signal, made up of electrical signal pulses whose widths are related to the size of objects in a scanned image together with electrical noise signals, comprising the steps of:
-
(i) scanning an image containing objects of different sizes to produce an analog electrical signal; (ii) converting the analog signal to a digital signal; (iii) ordinal value filtering at least a selected part of the digitized signal with a succession of filters of order increasing from N to M, producing an output signal from each filter, the input signal to each filter being the output signal from the previous filter in the succession; (iv) selecting an output from the succession of filter outputs; (v) applying the selected output signal to a signal analyzer to allow the output signal relating to objects in the image of one size to be separated from output signal relating to objects of another size.
-
-
5. A method of generating a pattern of pulses which represent a feature of an image to reduce the data obtained from scanning the image for onward transmission for processing comprising the steps of:
-
(i) producing a digitized video signal by scanning an image containing objects which during scanning produce electrical pulses of different widths; (ii) ordinal value filtering at least a selected part of the digitized signal with a succession of filters of order increasing from N up to M, producing an output from each filter, the input signal to each successive filter being the output signal from the previous filter in the succession and producing a band pass signal output containing zero, one or more pulses, each of which corresponds to a succession of equal value digital samples by subtracting each filter output from the output of the previous filter in the succession; (iii) selecting from the output pulses contained within the band pass signal outputs a predetermined subset of the pulses; (iv) combining the pulses of the subset to produce an electrical output signal whose amplitude is the sum of the value of all the pulses in the subset; and (v) supplying the said electrical output signal for onward transmission as the image data signal for subsequent processing.
-
Specification