US3930199A
Expired / Lapsed
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Means for determining frequency
Assignee: ABB Norden Holding AB
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Filing: 1974-12-31
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Granted: 1975-12-30
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Expires: 1994-12-31
Abstract
Abstract An arrangement for measuring frequency includes a counter unit and two multipliers connected in series with each other to the counter unit. A sensing unit senses each pulse in an unknown pulse train, the frequency of which is to be determined. The multipliers form a second pulse train, the frequency of which is proportional to the square of the content of the counter unit. The counter unit reduces its content by a predetermined amount for each pulse in the second pulse train. The sensing unit delivers a third pulse train to the counter unit, which causes the counter unit to preset its content to a predetermined maximum quantity. The content of the counter unit at the time of each pulse in the first pulse train indicates the frequency of the first pulse train.
Inventors
- 👤 Jaroslav Valis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:52
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/02; G01R23/10; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/489
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
193 words
Means for measuring frequency which comprises a counter unit (10), first and second multipliers (12,13) connected in series with each other, and connected to the counter unit, a sensing unit (15) including means for sensing each pulse in a first unknown pulse train (FX), the frequency (fx) of which is to be determined, said multipliers (12,13) including means to generate a second pulse train (F2), the frequency of which is proportional to the square of the content (F) of the counter unit (10), the counter unit (10) including means responsive to each pulse in the second pulse train (F2) to reduce the content (F) of the counter unit by a predetermined quantity, the sensing unit (15) including means to deliver a third pulse train (PRESET) to the counter unit (10), the counter unit (10) including means responsive to each pulse in the third pulse train (PRESET) to preset the content (F) of the counter unit to a predetermined greatest quantity (Fmax), the content (F) of the counter unit (10) at the time of each pulse in the first pulse train (FX) constituting a measure of the frequency (fx) of the first pulse train.
Claim 2
Dependent Claim
193 words
Means for measuring frequency which comprises a counter unit (10), first and second multipliers (12,13) connected in series with each other, and connected to the counter unit, a sensing unit (15) including means for sensing each pulse in a first unknown pulse train (FX), the frequency (fx) of which is to be determined, said multipliers (12,13) including means to generate a second pulse train (F2), the frequency of which is proportional to the square of the content (F) of the counter unit (10), the counter unit (10) including means responsive to each pulse in the second pulse train (F2) to reduce the content (F) of the counter unit by a predetermined quantity, the sensing unit (15) including means to deliver a third pulse train (PRESET) to the counter unit (10), the counter unit (10) including means responsive to each pulse in the third pulse train (PRESET) to preset the content (F) of the counter unit to a predetermined greatest quantity (Fmax), the content (F) of the counter unit (10) at the time of each pulse in the first pulse train (FX) constituting a measure of the frequency (fx) of the first pulse train.
Claim 3
Dependent Claim
30 words
Means according to claim 1, which comprises a clock unit means (14) to deliver a fourth pulse train (FC) with a known constant frequency (fc) to one of the multipliers.
Claim 4
Dependent Claim
28 words
Means according to claim 2, in which the frequency (f2) of said second pulse train (F2) is proportional to the frequency (fc) of said fourth pulse train (FC).
Claim 5
Dependent Claim
56 words
Means according to claim 3, in which the first multiplier (12) includes means to form a fifth pulse train (F1) in dependence on the content (F) of the counter unit (10) and of the fourth pulse train (FC) and the frequency (f1) of which is proportional to the frequency (fc) of the fourth pulse train (FC).
Claim 6
Dependent Claim
47 words
Means according to claim 4, in which the second multiplier (13) includes means to form a sixth pulse train (F2) in dependence on the content (F) Of the counter unit (10) and of the fifth pulse train (F1) and the frequency (f2) of the fourth pulse train.
Claim 7
Dependent Claim
20 words
Means according to claim 5, in which the second pulse train (F2) is equal to the sixth pulse train (F2).
Claim 8
Dependent Claim
23 words
Means according to claim 1, in which the counter unit (10) includes means to start counting down its contents (F) only a time
References Cited (Backward Citations)
US3445643A
Cited
US3895294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |