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US3781674A
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Noise discriminating circuitry and method for electronic particle study apparatus
Assignee: Coulter Electronics Inc
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Filing: 1971-07-22
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Granted: 1973-12-25
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Expires: 1991-07-22
Abstract
Abstract By discriminating against signal rise time, i.e., the duration of the leading edge of a signal, noise signals can be excluded from data transmisson wherein the data pulses normally have slower rise times, even though both noise and data pulses exceed low threshold settings. When the subject discrimination is employed in the environment of a Coulter particle analyzing apparatus, the minimum rise time of data pulses derived from monitored particles is a known value; therefore, all signals having faster rise time can be discriminated against. The discriminator can comprise a source of clock pulses and a simple binary counter by use of which the rise time of each signal is compared with a preset time or count value. All signals having a rise time greater than the preset value causes the discriminator to enable an output gate which passes the original signal to subsequent processing and analyzing circuits for particle analysis.
Inventors
- 👤 W Claps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:59
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/10; G01N15/1031; G01N15/12; G01N15/131; G01N15/132
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
86 words
A noise signal discriminating method for use in the electronic analysis of particles in which a particle-produced pulse is derived from each particle, comprising the steps of: defining as a standard the minimum acceptable rise time for particle-produced pulses, monitoring the rise time of all noise signals and particle pulses, comparing the monitored rise times against said standard, rejecting all monitored signals and pulses having a rise time shorter than said standard, and accepting all monitored signals and pulses having rise times greater than said standard.
Claim 2
Dependent Claim
86 words
A noise signal discriminating method for use in the electronic analysis of particles in which a particle-produced pulse is derived from each particle, comprising the steps of: defining as a standard the minimum acceptable rise time for particle-produced pulses, monitoring the rise time of all noise signals and particle pulses, comparing the monitored rise times against said standard, rejecting all monitored signals and pulses having a rise time shorter than said standard, and accepting all monitored signals and pulses having rise times greater than said standard.
Claim 3
Dependent Claim
28 words
A method according to claim 1 in which said defining of said standard is primarily dependent upon parameters established by the method and apparatus of the particle analysis.
Claim 4
Dependent Claim
21 words
A method according to claim 2 in which the particle analysis is in accordance with the operation of Coulter particle analysis.
Claim 5
Dependent Claim
16 words
A method according to claim 1 in which said comparing is accomplished in a digital mode.
Claim 6
Dependent Claim
25 words
A method according to claim 4 in which said digital mode is accomplished by use of a binary counting of the monitored rise time durations.
Claim 7
Dependent Claim
104 words
Noise signal discriminating circuitry for use with electronic particle analysis apparatus in which a particle-produced pulse is derived for each particle, said circuitry comprising: circuit means for defining as a standard the minimum acceptable rise time for particle-produced pulses, circuit means for monitoring the rise time of noise signals and particle pulses applied thereto, circuit means for comparing the monitored rise times against said standard, circuit means for rejecting all monitored and compared signals and pulses having a rise time shorter than said standard, and circuit means for accepting all monitored and compared signals and pulses having a rise time greater than said standard.
Claim 8
Dependent Claim
104 words
Noise signal discriminating circuitry for use with electronic particle analysis apparatus in which a particle-produced pulse is derived for each particle, said circuitry comprising: circuit means for defining as a standard the minimum acceptable rise time for particle-produced pulses, circuit means for monitoring the rise time of noise signals and particle pulses applied thereto, circuit means for comparing the monitored rise times against said standard, circuit means for rejecting all monitored and compared signals and pulses having a rise time shorter than said standard, and circuit means for accepting all monitored and compared signals and pulses having a rise time greater than said standard.
Claim 9
Dependent Claim
26 words
Circuitry according to claim 6 in which each of said defining, monitoring, comparing, rejecting, and accepting circuit means includes and primarily comprises a common circuit element.
Claim 10
Dependent Claim
13 words
Circuitry according to claim 7 in which said circuit element is a counter.
Claim 11
Dependent Claim
28 words
Circuitry according to claim 8 in which said counter is designed to respond to each said monitored rise time when it exceeds a digitalized measurement of said standard.
Claim 12
Dependent Claim
29 words
Circuitry according to claim 9 which includes a source of clock pulses for providing to said counter a time base whereby the digitalized measurement is also a time measurement.
Claim 13
Dependent Claim
68 words
Circuitry according to claim 10 in which gating means is interposed between a clock pulse input to said counter and said source of clock pulses, and said gating means also is connected to respond to the acceptance of any compared signal or pulse by said counter to thereby inhibit passage of clock pulses to said counter for the remainder of the rise time for that signal or pulse.
Claim 14
Dependent Claim
31 words
Circuitry according to claim 8 in which said counter has a reset input which receives each said pulse and signal for purposes of resetting said counter subsequent to each rise time.
Claim 15
Dependent Claim
21 words
Circuitry according to claim 6 in which pulse height analyzing means is coupled to the output of said accepting circuit means.
Claim 16
Dependent Claim
28 words
Circuitry according to claim 6 and in combination therewith an electronic particle analysis apparAtus for generating the particle-produced pulses, and means for supplying said pulses to said circuitry.
Claim 17
Dependent Claim
31 words
The combination according to claim 14 in which said apparatus is in the form of a Coulter particle analyzer and in which the detector portion thereof is connected to said circuitry.
Claim 18
Dependent Claim
39 words
The combination according to claim 14 in which a coincidence gate is connected to the output of said circuitry and low threshold means is coupled in parallel with said circuitry, and has a control input to said coincidence gate.
Claim 19
Dependent Claim
21 words
The combination according to claim 16 in which pulse height analyzing means is coupled to the output of said coincidence gate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |