US4309757A
Expired / Lapsed
US
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Method for classification of signals by comparison with an automatically determined threshold
Assignee: Rheinmetall Air Defence AG
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Filing: 1979-12-03
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Granted: 1982-01-05
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Expires: 1999-12-03
Abstract
Abstract A method of separating signal classes in a stored signal quantum or set of signals correlated to a histogram in that there is looked for the minimum between two neighboring signal classes by mutual comparison of the stored signal values in a partial range of the histogram and there is stored as a separation threshold the characteristic of the thus determined channel characterizing the minimum, so that there can be differently evaluated signal values at different sides of such separation threshold. The invention is preferably used for particle analysis in haematology.
Inventors
- 👤 Raymond Frey
- 👤 Rudolf Voellmy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:48
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/10; G01N15/1031; G01N15/12; G01N15/131; G01N15/132; G06; G06F; G06F17/00; G06F17/10; G06F17/18; G06V; G06V20/00; G06V20/60; G06V20/69; G06V20/698
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
241 words
A method for determining a separation threshold for separating at least two signal classes in a signal quantity, composed of individual signals, which are converted by a feeler element into electrical signals and stored in a storage, comprising the steps of: (a) ordering the stored signal quantities which are present for analysis in storages organized into K-channels so as to form a histogram; (b) determining within a coherent number of N-channels of the histogram by mutual comparison of the signal values stored in the N-channels or values derived therefrom one of such channels whose signal value is smallest; (c) thereafter storing a characteristic value correlated to the thus determined channel as the separation threshold within the histogram so that there can be evaluated different signal values to different sides of such separation threshold; (d) comparing the signal value of the determined channel with each of the signal values of a multiplicity of P L -channels directly following one side of the determined channel and with each of the signal values of a multiplicity of P R -channels directly following the other side of the determined channel; and (e) if during step (d) above there prevails at least a signal value in subsequent P L -channels or P R -channels which is smaller than the signal value of the determined channel repeating step (b) above with a different selection of N-channels until the signal value of the determined channel is the smallest.
Claim 2
Independent Claim
241 words
A method for determining a separation threshold for separating at least two signal classes in a signal quantity, composed of individual signals, which are converted by a feeler element into electrical signals and stored in a storage, comprising the steps of: (a) ordering the stored signal quantities which are present for analysis in storages organized into K-channels so as to form a histogram; (b) determining within a coherent number of N-channels of the histogram by mutual comparison of the signal values stored in the N-channels or values derived therefrom one of such channels whose signal value is smallest; (c) thereafter storing a characteristic value correlated to the thus determined channel as the separation threshold within the histogram so that there can be evaluated different signal values to different sides of such separation threshold; (d) comparing the signal value of the determined channel with each of the signal values of a multiplicity of P L -channels directly following one side of the determined channel and with each of the signal values of a multiplicity of P R -channels directly following the other side of the determined channel; and (e) if during step (d) above there prevails at least a signal value in subsequent P L -channels or P R -channels which is smaller than the signal value of the determined channel repeating step (b) above with a different selection of N-channels until the signal value of the determined channel is the smallest.
Claim 3
Dependent Claim
21 words
The method as defined in claim 1, further including the steps of: smoothing the histogram between the steps (a) and (b).
Claim 4
Dependent Claim
33 words
The method as defined in claim 1, further including the steps of: correlating for haematological use the range of the characteristic value of the K-channels to a particle volume range of 0-300 femtoliters.
Claim 5
Dependent Claim
19 words
The method as defined in claim 3, wherein: the channel characteristic values correspond to the particle values in femtoliter.
Claim 6
Dependent Claim
16 words
The method as defined in claim 4, wherein: P L is equal to P R .
Claim 7
Dependent Claim
17 words
The method as defined in claim 4, wherein: P L is an integer and smaller than N/2.
Claim 8
Dependent Claim
17 words
The method as defined in claim 4, wherein: P L is an integer and equal to N/2.
Claim 9
Dependent Claim
20 words
The method as defined in claim 1, wherein: the value of N corresponds to integer values between K/20 and K/5.
Claim 10
Dependent Claim
16 words
The method as defined in claim 1, wherein: P L is equal to P R .
Claim 11
Dependent Claim
28 words
The method as defined in claim 1, further including the steps of: utilizing the signal value of the channel corresponding to the separation threshold as a quality criterion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |